Electrical Standards for Construction Safety_Elect… · Web viewCONTROL LLC. Date. 2019...

LUNAR CORROSIONCONTROL LLC

Date2019

DepartmentSafety DepartmentApproved by: Management

TABLE OF CONTENTS

I. PURPOSE ………………………………………………………………………………………. 1II. SCOPE ………………………………………………………………………………………. 1III. RESPONSIBILITIES ……………………………………………………………………………... 1IV. REFERENCES ……………………………………………………………………………………….. 2V. SAFETY PROGRAM ……………………………………………………………………………… 2

A. EXAMINATION, INSTALLATION, USE OF EQUIPMENT ……………………………… 2B. GUARDING ……………………………………………………………………………… 2C. OVERCURRENT PROTECTION …………………………………………………………… 3D. FIXED DISTRIBUTION CIRCUITS …………………………………………………………… 3E. GROUNDING OF EQUIPMENT CONNECTED BY CORD AND PLUG ………………….. 3

VI. SAFETY-RELATED WORK PRACTICES ………………………………………………………… 5A. PROTECTION OF EMPLOYEES …………………………………………………………… 5B. PASSAGEWAYS AND OPEN SPACES …………………………………………………. 6C. LOCKOUT / TAGOUT OF CIRCUITS …………………………………………………. 6D. MAINTENANCE OF EQUIPMENT …………………………………………………………… 6E. PORTABLE GENERATORS…………………………………………………………………….. 6F. ENVIRONMENTAL DETERIORATION OF EQUIPMENT ………………………………. 6G. BATTERIES ………………………………………………………………………………. 7H. INSTALLATION AND GROUNDING…………………………………………………………… 7I. GROUND FAULT CIRCUIT INTERUPTOR …………………………………………………. 7J. HAZARDOUS LOCATIONS…………………………………………………………………….. 8K. RECORDS ………………………………………………………………………………………... 9

ATTACHMENTSATTACHMENT A: DEFINITIONS …………………………………………………………… 9ATTACHMENT B: GROUNDING PORTABLE GENERATORS PROCEDURE………… 16ATTACHMENT C: INSTALLATION OF INTERRUPTER ………………………………. 18ATTACHMENT D: TRANSFORMER RECTIFIER INSTALLATION …………………. 20

I. PURPOSEMinimization of the risk of electrocution begins with proper electrical grounding of circuits and portable extension cords. The Lunar facility will maintain a procedure which periodically evaluates circuits and extension cords, tags and removes defective equipment from service, and makes timely repairs to those found defective.

II. SCOPEElectricity has long been recognized as a serious workplace hazard, exposing employees to such dangers as electric shock, electrocution, fires, and explosions. Experts in electrical safety have traditionally looked toward the widely used National Electrical Code (NEC) for help in the practical safeguarding of persons from these hazards. The Occupational Safety and Health Administration (OSHA) recognized the important role of the NEC in defining basic requirements for safety in electrical installations.

III. RESPONSIBILITIESA. The Safety Services Department (SSD) is responsible for the proper training. The SSD has the

authority to halt any operation of the company where there is danger of exposure to any uncontrolled energy.

Electrical Program 2015Lunar Corrosion Control LLC

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Electrical SafetyProgram

B. The EH&S Coordinator at the facility has the overall responsibility to ensure compliance and effectiveness of the Electrical Safety Program.

C. All Employees shall observe training and instructions received regarding the Electrical Safety Program.

IV. REFERENCES1926.402 Electrical Applicability1926.403 Electrical General Requirements1926.404 Electrical Wiring, Design and Protection1926.405 Electrical Wiring Methods, Components and Equipment for General Use1926.406 Electrical Specific-Purpose Equipment and Installations1926.407 Electrical Hazardous (Classified) Locations1926.408 Electrical Special Systems1926.416 Electrical Special Requirements1926.417 Electrical Locking and Tagging of Circuits1926.431 Electrical Maintenance of Equipment1926.441 Electrical Batteries and Battery Charging1910.147 Lockout / Tagout Lunar Corrosion Control LLC Lockout/Tagout ProgramLunar Corrosion Control LLC Personal Protective EquipmentNational Electrical Code

V. SAFETY PROGRAM

A. Examination, Installation, and Use of Equipment :1. Lunar Corrosion Control LLC will ensure that electrical equipment is free from recognized hazards

that are likely to cause death or serious physical harm to employees. Safety of equipment must be determined by the following:

a. Suitability for installation and use in conformity with the provisions of the standard.b. Suitability of equipment for an identified purpose may be evidenced by a listing, by labeling,

or by certification for that identified purpose. c. Mechanical strength and durability. For parts designed to enclose and protect other

equipment, this includes the adequacy of the protection thus provided. d. Electrical insulation. e. Heating effects under conditions of use. f. Arcing effects. g. Classification by type, size, voltage, current capacity, and specific use. h. Other factors that contribute to the practical safeguarding of employees who use or are likely

to come in contact with the equipment.

B. Guarding :1. Live parts of electric equipment operating at 50 volts or more must be guarded against accidental

contact. Guarding of live parts must be accomplished as follows: a. Location in a cabinet, room, vault, or similar enclosure accessible only to qualified persons. b. Use of permanent, substantial partitions or screens to exclude unqualified persons. c. Location on a suitable balcony, gallery, or platform elevated and arranged to exclude

unqualified persons. d. Elevation of eight feet or more above the floor.

2. Entrance to rooms and other guarded locations containing exposed live parts must be marked with conspicuous warning signs forbidding unqualified persons to enter.

3. Electric installations that are over 600 volts and that are open to unqualified persons must be made with metal-enclosed equipment or enclosed in a vault or area controlled by a lock. In addition, equipment must be marked with appropriate caution signs.


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C. Over-current Protection :1. The following requirements apply to over-current protection of circuits rated 600 volts, nominal, or less:

a. Conductors and equipment must be protected from over-current in accordance with their ability to safely conduct current and the conductors must have sufficient current-carrying capacity to carry the load.

b. Over-current devices must not interrupt the continuity of the grounded conductor unless all conductors of the circuit are opened simultaneously, except for motor-running overload protection.

c. Over-current devices must be readily accessible and not located where they could create an employee safety hazard by being exposed to physical damage or located in the vicinity of easily ignitable material.

d. Fuses and circuit breakers must be so located or shielded that employees will not be burned or otherwise injured by their operation, e.g., arcing.

D. Fixed Distribution Circuits :1. For fixed permanent electrical systems, ground continuity will be maintained to earth, through

disconnect and distribution panels, to all outlets, lighting circuits and powered machinery. 2. All electrical circuits which exceed 50 VAC should only be installed and inspected by a qualified

electrician who has satisfied the State and Local Regulations regarding electrical installations. This qualified electrician should also make any needed repairs to the high voltage circuits in accordance with the applicable National Electrical Code.

3. For 110/120 VAC distribution and outlets, testing of ground continuity will be performed after any repair or replacement of components, when any evidence of a deficiency is apparent by the qualified electrician, and annually by a Lunar competent person.

4. These tests can be performed by a Lunar employee following simple instructions, using a “circuit tester” inserted into 110/120 VAC outlets.

5. The test will indicate condition of the circuit, confirming safe or unsafe wiring. This “circuit tester” instrument is inexpensive, readily available at our safety Supply Company, hardware/building supply stores, and mandatory for the facility.

E. Grounding of Equipment Connected by Cord and Plug :1. Exposed noncurrent-carrying metal parts of cord- and plug-connected equipment that may become

energized must be grounded in the following situations: a. When in a hazardous (classified) location. b. When operated at over 150 volts to ground, except for guarded motors and metal frames of

electrically heated appliances if the appliance frames are permanently and effectively insulated from ground.

c. Hand held motor-operated tools. Cord- and plug-connected equipment used in damp or wet locations or by employees standing on the ground or on metal floors or working inside metal tanks or boilers. Portable and mobile X-ray and associated equipment. Tools likely to be used in wet and/or conductive locations.

d. Ground conductors shall be of sufficient size to carry the maximum expected ground fault current of the equipment.

2. Extension Cordsa. All Extension Cords used within shops and at jobs will conform to the following:

(1) Be of one continuous length, without any splices(2) Be of heavy duty, rough service quality(3) Be 3 conductor, of proper size to carry expected loads(4) Be fitted with Ground Fault Circuit Interrupter (GFCI), or inserted only into a GFCI protected

panel or outlet(5) Be inspected daily before use, or following damage(6) Be Tested for full continuity of all conductors, from plug to plug, on a Quarterly basis(7) Be repaired when outer casing minor insulation damage or broken plug/prong occurs


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(8) Be replaced when conductor insulation is cut through, or when the plug(s) or outer casing are damaged beyond repair

3. Portable Power Toolsa. All electrical power tools which are not “Double Insulated” will use a three prong conductor

power cord with grounded plug. These tools will be inspected and tested for ground continuity every quarter, and repaired as necessary.

b. Portable electric tools which do not pass inspection will be taken out of service until repaired, or discarded.

4. Quarterly Inspection and Testing of Portable Electrical Cords and Tools.a. Electrical Power tools will undergo the following:

(1) Inspection of the tool housing for physical damage that exposes any electrical or mechanical components normally enclosed.

(2) Inspection of the power cord and plug for:(a) Damaged or missing connector prongs(b) “Field repairs” which do not adequately protect against electrical leakage or exposure to

conductor wires(c) Full continuity of all conductors, plug to plug(d) Correct polarity of each conductor

b. Inspection to include operation of the power tool (test run) observing proper function of the control switch/button/trigger. The observation must also determine the tool performs as designed, and has not been “field” modified.

c. Electrical Power tools will be repaired to perform according to the manufacturers’ specifications and design. If damage(s) cannot be repaired, the tool will be destroyed to prevent further use, and discarded.

d. Inspected and “passed” electrical power tools will be coded with the attachment of a durable tape on the cord, near the “male” plug, according to the following schedule:

Quarter Color

1st −January – March Red2nd − April – June Blue3rd −July − September Green4th −October − December White

Any tool not coded with the current correct color will be immediately taken out of service and returned to the shop for inspection/testing. Only those tools with the current correct color code tape will be used.

e. Electrical extension cords will undergo the following:(1) Inspection of the entire cord and plug(s) will include:

(a) Cuts, tears, crushing or pinching.(b) Damaged or missing connector prongs.(c) “Field repairs” which do not adequately protecting against leakage or exposure to

conductor wires.(d) Correct polarity of each conductor, plug to plug.(e) Full conductivity of each conductor, plug to plug.

f. When equipped with Ground Fault Interrupt Circuit protection, test for proper “tripping” by:(1) Operation of the “test” button on the GFCI outlet end, and (2) Introduction of fault ”leakage” trip current, by use of appropriate test device inserted into the

outlet end.g. Cords shall be repaired when such repairs will not compromise the manufacturers specifications

for ampacity, polarity, continuity, and insulation. h. End plugs (male or female) shall be replaced with units of equal specification or designation. i. Cords damaged beyond repair will be cut into lengths shorter than 3 feet, and discarded.


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j. Inspected and “passed” electrical power tools will be coded with the attachment of a durable tape on the cord, near the “male” plug, according to the following schedule:

Quarter Color

1st −January – March Red2nd − April – June Blue3rd −July − September Green4th −October − December White

Any tool not coded with the current correct color will be immediately taken out of service and returned to the shop for inspection/testing. Only those tools with the current correct color code tape will be used.

VI. SAFETY RELATED WORK PLACE PRACTICES

A. Protection of Employees: 1. Lunar will not permit an employee to work near any part of an electric power circuit that the

employee could contact in the course of work, unless the employee is protected against shock by de-energizing the circuit and grounding it or by guarding it effectively by insulation or other means.

2. Where the exact location of underground electric power lines is unknown, employees using jack hammers or hand tools that may contact a line must be provided with rubber insulated protective gloves.

3. Even before work is begun, the supervisor must determine by inquiry, observation, or instruments where any part of an exposed or concealed energized electric power circuit is located. This is necessary because a person, tool or machine could come into physical or electrical contact with the electric power circuit.

4. The supervisor and/or customer is required to advise employees of the location of such lines, the hazards involved, and protective measures to be taken as well as to post and maintain proper warning signs.

5. Installation, maintenance, and repair of the rectifiers and controllers associated with cathodic protection will require work in close proximity to energized (“live”) electrical conductors, contacts, and circuits. Only persons who are properly qualified for this work shall perform it!

6. Before such work begins, the Competent Person shall identify (any) all parts of the current-carrying components which will/may expose the Qualified Person(s) to electrical shock. The exposing parts will be clearly marked or listed, and each Qualified Person will be instructed in the hazard, location, and protective measures for avoidance before commencing work.

7. In addition to the evaluation of electrical hazards, the Competent Person shall determine that the workspace does not present other hazards to safety and health. These include, but aren’t limited to, air quality, temperature extremes, high noise, vermin, or poor illumination. Appropriate control measures, such as, reliable temporary lighting, shall be instituted before work begins.

8. The first priority in electrical safety is to de-energize circuits to be worked on. When this cannot be done, a means of (temporary) guarding with protective shields and barriers, or dielectric insulation will be applied.

9. When the exposing energized circuit/component cannot shield or be insulated, the Qualified Person(s) will avoid bodily contact by maintaining the following clearance:

Voltage Range (phase to phase) Minimum Distance300 V and less Avoid Contact300 V to 750 V 36”

(No work with in excess bodily contact of 500 V AC is performed.)


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10. In every case where hand/arm contact with electrically energized components (operating at 50 Volts or more to ground) might occur, Qualified Person(s) will wear dielectric gloves and sleeves in accordance with the Lunar Personal Protective Equipment Program.

11. Hand tools whether insulated or not should never be used on energized electrical boards.12. Insulated gloves, sleeves, and tools will be inspected before each use, to ensure there are no breaks

or tears in the insulation. If any damage to these protective tools and/or apparel defeats the needed insulation, the defective item will be discarded as unsafe.

13. On rare occasions there may be a need to transport anodes, conduit, or some other (lengthy, rigid) conducting material into a space where exposed electrical contacts exist and the circuit cannot be de-energized. Practical means to prevent electrical shock from unintended contact will be used; these include:a. Covering the carried conductor with an insulating shield or drape.b. 2-man carry, to maintain control of the conductor.c. De-energizing the circuits while the carried conductor is taken through the work space, or

placed into its intended position within the space.d. Wearing dielectric insulated gloves while carrying the lengthy conductor(s).e. Carrying one piece at a time.

B. Passageways and Open Spaces:1. Lunar will provide barriers or other means of guarding to ensure that workspace for electrical

equipment will not be used as a passageway during the time when energized parts of electrical equipment are exposed. Walkways and similar working spaces must be kept clear of electric cords.

C. Lockout and Tagging of Circuits:1. Tags must be placed on controls that are to be deactivated during the course of work on energized

or de-energized equipment or circuits. Equipment or circuits that are de-energized must be rendered inoperative and have tags attached at all points where such equipment or circuits can be energized. Reference Lunar’s Lockout / Tagout Program.

D. Maintenance of Equipment :1. Lunar will ensure that all wiring components and utilization equipment in hazardous locations are maintained in a dust-tight, dust-ignition-proof, or explosion-proof condition without loose or missing screws, gaskets, threaded connections, seals, or other impairments to a tight condition.

E. Portable Generators :1. Truck-mounted and small portable electric generators will be bonded and grounded in accordance

with the Lunar “Grounding of Portable Generators” see Attachment B.

F. Environmental Deterioration of Equipment :1. Unless designed in accordance with the National Electrical Code for use in the operating

environment, no conductors or equipment can be located: a. In damp or wet locations. b. Where exposed to gases, fumes, vapors, liquids, or other agents having a deteriorating effect

on the conductors or equipment. c. Where exposed to excessive temperatures.

2. Control equipment, utilization equipment, and busways approved for use in dry locations only must be protected against damage from the weather during building construction.

3. For protection against corrosion, raceways, cable armor, boxes, cable sheathing, cabinets, elbows, couplings, fittings, supports, and support hardware must be of materials appropriate for the environment in which they are installed.


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G. Batteries :

1. Batteries of the unsealed type must be located in enclosures with outside vents or in well-ventilated rooms arranged to prevent the escape of fumes, gases, or electrolyte spray into other areas. Other provisions include the following:a. Ventilation-to ensure diffusion of the gases from the battery and to prevent the accumulation

of an explosive mixture.b. Racks and trays-treated to make them resistant to the electrolyte.c. Floors-acid-resistant construction unless protected from acid accumulations.d. Face shields, aprons, and rubber gloves-for workers handling acids or batteries.e. Facilities for quick drenching of the eyes and body-within 25 feet (7.62 m) of battery handling

areas.f. Facilities-for flushing and neutralizing spilled electrolytes and for fire protection.

2. Battery Charginga. Battery charging installations must be located in areas designated for that purpose. b. When batteries are being charged, vent caps must be maintained in functioning condition and

kept in place to avoid electrolyte spray. Also, charging apparatus must be protected from damage by trucks.

H. Insulation and Grounding :I.

1. Insulation and grounding are two recognized means of preventing injury during electrical equipment operation. Conductor insulation may be provided by placing nonconductive material such as plastic around the conductor. Grounding may be achieved through the use of a direct connection to a known ground such as a metal cold water pipe. Ground connectors to gas pipelines are not allowed.

2. Consider, for example, the metal housing or enclosure around a motor or the metal box in which electrical switches, circuit breakers, and controls are placed. Such enclosures protect the equipment from dirt and moisture and prevent accidental contact with exposed wiring. However, there is a hazard associated with housings and enclosures. A malfunction within the equipment—such as deteriorated insulation—may create an electrical shock hazard.

3. Many metal enclosures are connected to a ground to eliminate the hazard. If a "hot" wire contacts a grounded enclosure, a ground fault results which normally will trip a circuit breaker or blow a fuse. Metal enclosures and containers are usually grounded by connecting them with a wire going to ground. This wire is called an equipment grounding conductor. Most portable electric tools and appliances are grounded by this means. There is one disadvantage to grounding: a break in the grounding system may occur without the user's knowledge.

4. Insulation may be damaged by hard usage on the job or simply by aging. If this damage causes the conductors to become exposed, the hazards of shocks, burns, and fire will exist. Double insulation may be used as additional protection on the live parts of a tool, but double insulation does not provide protection against defective cords and plugs or against heavy moisture conditions.

5. The use of a ground-fault circuit interrupter (GFCI) is one method used to overcome grounding and insulation deficiencies.

J. Ground Fault Circuit Interrupter (GFCI ):1. The ground-fault circuit interrupter (GFCI) is a fast-acting circuit breaker which senses small

imbalances in the circuit caused by current leakage to ground and, in a fraction of a second, shuts off the electricity.

2. The GFCI continually matches the amount of current going to an electrical device against the amount of current returning from the device along the electrical path. Whenever the amount "going" differs from the amount "returning" by approximately 5 milliamps, the GFCI interrupts the electric power within as little as 1/40 of a second.


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3. The GFCI will not protect the employee from line-to-line contact hazards (such as a person holding two "hot" wires or a hot and a neutral wire in each hand). It does provide protection against the most common form of electrical shock hazard--the ground fault.

4. It also provides protection against fires, overheating, and destruction of insulation on wiring.

K. Hazardous (Classified) Locations :1. The National Electrical Code (NEC) defines hazardous locations as those areas "where fire or

explosion hazards may exist due to flammable gases or vapors, flammable liquids, combustible dust, or ignitable fibers or filings."

2. A substantial part of the NEC is devoted to the discussion of hazardous locations. That's because electrical equipment can become a source of ignition in these volatile areas. Hazardous locations are classified in three ways by the National Electrical Code: TYPE, CONDITION, and NATURE.

3. Hazardous Location Typesa. Class I Locations

(1) The first type of hazard is one which is created by the presence of flammable gases or vapors in the air, such as natural gas or gasoline vapor. Some typical Class I locations are:

(a) Petroleum refineries, and gasoline storage and dispensing areas; (b) Dry cleaning plants where vapors from cleaning fluids can be present; (c) Spray finishing areas; (d) Aircraft hangars and fuel servicing areas; and (e) Utility gas plants, and operations involving storage and handling of

liquefied petroleum gas or natural gas. (2) All of these are Class I . . . gas or vapor . . . hazardous locations. All require special Class

I hazardous location equipment. b. Class II Locations

(1) The second type of hazard listed by the National Electrical Code are those areas made hazardous by the presence of combustible dust. These are referred to in the Code as "Class II Locations." Finely pulverized material, suspended in the atmosphere, can cause as powerful an explosion as one occurring at a petroleum refinery. Some typical Class II locations are:

(a) Grain elevators; (b) Flour and feed mills; (c) Plants that manufacture, use or store magnesium or aluminum powders;(d) Producers of plastics, medicines and fireworks; (e) Producers of starch or candies; (f) Spice-grinding plants, sugar plants and cocoa plants; and (g) Coal preparation plants and other carbon handling or processing areas.

c. Class III Locations(1) Class III hazardous locations, according to the NEC, are areas where there are easily-ignitable fibers or filings present, due to the types of materials being handled, stored, or processed. The fibers and filings are not likely to be suspended in the air, but can collect around machinery or on lighting fixtures and where heat, a spark or hot metal can ignite them. Some typical Class III locations are:

(a) Textile mills, cotton gins; (b) Cotton seed mills, flax processing plants; and (c) Plants that shape, pulverize or cut wood and create sawdust or filings.

4. Hazardous Location Conditionsa. In addition to the types of hazardous locations, the National Electrical Code also concerns itself

with the kinds of conditions under which these hazards are present. The Code specifies that hazardous material may exist in several different kinds of conditions which, for simplicity, can be described as, first, normal conditions, and, second, abnormal conditions.

b. In the normal condition, the hazard would be expected to be present in everyday production operations or during frequent repair and maintenance activity.


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c. When the hazardous material is expected to be confined within closed containers or closed systems and will be present only through accidental rupture, breakage or unusual faulty operation, the situation could be called "abnormal."

5. Nature of Hazardous Substancesa. The gases and vapors of Class I locations are broken into four groups by the Code: A, B, C, and

These materials are grouped according to the ignition temperature of the substance, its explosion pressure, and other flammable characteristics.(1) Group A is acetylene(2) Group B is hydrogen and other materials with similar characteristics. (3) Group C and Group D are by far the most usual Class I groups. They comprise the greatest

percentage of all Class I hazardous locations. Found in Group D are many of the most common flammable substances such as butane, gasoline, natural gas and propane.

b. In Class II - dust locations - we find the hazardous materials in Groups E, F, and G. These groups are classified according to the ignition temperature and the conductivity of the hazardous substance. Conductivity is an important consideration in Class II locations, especially with metal dusts.(1) Metal dusts are categorized in the Code as Group E. Included here are aluminum and

magnesium dusts and other metal dusts of similar nature.(2) Group F atmospheres contain such materials as carbon black, charcoal dust, coal and coke

dust.(3) In Group G we have grain dusts, flour, starch, cocoa, and similar types of materials.

L. Records :1. Written documentation of all electrical device inspection, testing, maintenance and repair will be

retained by the facility manager until replaced by a more current record.2. With regard to “electrical work” performed by Lunar Employees, the following safety criteria apply:

a. No repair, adjustment, modification, or installation of any energized electrical circuit, component tool, or machine will be performed by any unqualified employee of Lunar or its contracted affiliates. Only after it is confirmed certain that exposure to electrical shock potential is removed will such work being performed.

b. For the facility occupied by Lunar, any modifications and improvements to the fixed electrical distribution system of the structure will be installed by a licensed electrical contractor; however, a Lunar staff member so licensed and qualified may perform limited electrical work on premises.


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ATTACHMENTSAttachment A DefinitionsAccepted. An installation is "accepted" if a permit for the work was issued, was inspected and found by a nationally recognized testing laboratory or local inspector having jurisdiction to conform to specified plans or to procedures of applicable codes and laws.Accessible. (As applied to wiring methods.) Capable of being removed or exposed without damaging the building structure or finish, or not permanently closed in by the structure or finish of the building. (See "concealed" and "exposed.")Accessible. (As applied to equipment.) Admitting close approach; not guarded by locked doors, elevation, or other effective means. (See "Readily accessible.")Ampacity. Current-carrying capacity of electric conductors expressed in amperes.Appliances. Utilization equipment, generally other than industrial, normally built in standardized sizes or types, which is installed or connected as a unit to perform one or more functions such as clothes washing, air conditioning, food mixing, deep frying, etc.Approved. Acceptable to the authority enforcing this subpart. The authority enforcing this subpart is the Assistant Secretary of Labor for Occupational Safety and Health. The definition of "acceptable" indicates what is acceptable to the Assistant Secretary of Labor, and therefore approved within the meaning of this Subpart.Approved for the purpose. Approved for a specific purpose, environment, or application described in a particular standard requirement.Armored cable. Type AC armored cable is a fabricated assembly of insulated conductors in a flexible metallic enclosure.Askarel. A generic term for a group of nonflammable synthetic chlorinated hydrocarbons used as electrical insulating media. Askarels of various compositional types are used. Under arcing conditions the gases produced, while consisting predominantly of noncombustible hydrogen chloride, can include varying amounts of combustible gases depending upon the askarel type.Attachment plug (Plug cap)(Cap). A device which, by insertion in a receptacle, establishes connection between the conductors of the attached flexible cord and the conductors connected permanently to the receptacle.Automatic. Self-acting, operating by its own mechanism when actuated by some impersonal influence, as, for example, a change in current strength, pressure, temperature, or mechanical configuration.Bare conductor. See Conductor.Bonding. The permanent joining of metallic parts to form an electrically conductive path which will assure electrical continuity and the capacity to conduct safely any current likely to be imposed.Bonding jumper. A reliable conductor to assure the required electrical conductivity between metal parts required to be electrically connected.Branch circuit. The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s).Building. A structure which stands alone or which is cut off from adjoining structures by fire walls with all openings therein protected by approved fire doors.Cabinet. An enclosure designed either for surface or flush mounting, and provided with a frame, mat, or trim in which a swinging door or doors are or may be hung.Cable tray system. A cable tray system is a unit or assembly of units or sections, and associated fittings, made of metal or other noncombustible materials forming a rigid structural system used to support cables. Cable tray systems include ladders, troughs, channels, solid bottom trays, and other similar structures.Cablebus. Cablebus is an approved assembly of insulated conductors with fittings and conductor terminations in a completely enclosed, ventilated, protective metal housing.Center pivot irrigation machine. A center pivot irrigation machine is a multi-motored irrigation machine which revolves around a central pivot and employs alignment switches or similar devices to control individual motors.Certified. Equipment is "certified" if it (a) has been tested and found by a nationally recognized testing laboratory to meet nationally recognized standards or to be safe for use in a specified manner, or (b) is of a kind whose production is periodically inspected by a nationally recognized testing laboratory, and (c) it bears a label, tag, or other record of certification.Electrical Program 2015

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Conduit body. A separate portion of a conduit or tubing system that provides access through a removable cover(s) to the interior of the system at a junction of two or more sections of the system or at a terminal point of the system. Boxes such as FS and FD or larger cast or sheet metal boxes are not classified as conduit bodies.Controller. A device or group of devices that serves to govern, in some predetermined manner, the electric power delivered to the apparatus to which it is connected.Cooking unit, counter-mounted. A cooking appliance designed for mounting in or on a counter and consisting of one or more heating elements, internal wiring, and built-in or separately mountable controls. (See Oven, wall-mounted.)Covered conductor. See Conductor.Cutout. (Over 600 volts, nominal.) An assembly of a fuse support with either a fuseholder, fuse carrier, or disconnecting blade. The fuseholder or fuse carrier may include a conducting element (fuse link), or may act as the disconnecting blade by the inclusion of a nonfusible member.Cutout box. An enclosure designed for surface mounting and having swinging doors or covers secured directly to and telescoping with the walls of the box proper. (See Cabinet.)Damp location. See Location.Dead front. Without live parts exposed to a person on the operating side of the equipment.Device. A unit of an electrical system which is intended to carry but not utilize electric energy.Dielectric heating. Dielectric heating is the heating of a nominally insulating material due to its own dielectric losses when the material is placed in a varying electric field.Disconnecting means. A device, or group of devices, or other means by which the conductors of a circuit can be disconnected from their source of supply.Disconnecting (or Isolating) switch. (Over 600 volts, nominal.) A mechanical switching device used for isolating a circuit or equipment from a source of power.Dry location. See Location.Electric sign. A fixed, stationary, or portable self-contained, electrically illuminated utilization equipment with words or symbols designed to convey information or attract attention.Enclosed. Surrounded by a case, housing, fence or walls which will prevent persons from accidentally contacting energized parts.Enclosure. The case or housing of apparatus, or the fence or walls surrounding an installation to prevent personnel from accidentally contacting energized parts, or to protect the equipment from physical damage.Equipment. A general term including material, fittings, devices, appliances, fixtures, apparatus, and the like, used as a part of, or in connection with, an electrical installation.Equipment grounding conductor. See Grounding conductor, equipment.Explosion-proof apparatus. Apparatus enclosed in a case that is capable of withstanding an explosion of a specified gas or vapor which may occur within it and of preventing the ignition of a specified gas or vapor surrounding the enclosure by sparks, flashes, or explosion of the gas or vapor within, and which operates at such an external temperature that it will not ignite a surrounding flammable atmosphere.Exposed. (As applied to live parts.) Capable of being inadvertently touched or approached nearer than a safe distance by a person. It is applied to parts not suitably guarded, isolated, or insulated. (See Accessible. and Concealed.)Externally operable. Capable of being operated without exposing the operator to contact with live parts.Feeder. All circuit conductors between the service equipment, or the generator switchboard of an isolated plant, and the final branch-circuit overcurrent device.Fitting. An accessory such as a locknut, bushing, or other part of a wiring system that is intended primarily to perform a mechanical rather than an electrical function.Fuse. (Over 600 volts, nominal.) An overcurrent protective device with a circuit opening fusible part that is heated and severed by the passage of overcurrent through it. A fuse comprises all the parts that form a unit capable of performing the prescribed functions. It may or may not be the complete device necessary to connect it into an electrical circuit.Ground. A conducting connection, whether intentional or accidental, between an electrical circuit or equipment and the earth, or to some conducting body that serves in place of the earth.Grounded. Connected to earth or to some conducting body that serves in place of the earth.Grounded, effectively. (Over 600 volts, nominal.) Permanently connected to earth through a ground connection of sufficiently low impedance and having sufficient ampacity that ground fault current which may occur cannot build up to voltages dangerous to personnel.Electrical Program 2015


Grounded conductor. A system or circuit conductor that is intentionally grounded.Grounding conductor. A conductor used to connect equipment or the grounded circuit of a wiring system to a grounding electrode or electrodes.Grounding conductor, equipment. The conductor used to connect the non-current-carrying metal parts of equipment, raceways, and other enclosures to the system grounded conductor and/or the grounding electrode conductor at the service equipment or at the source of a separately derived system.Grounding electrode conductor. The conductor used to connect the grounding electrode to the equipment grounding conductor and/or to the grounded conductor of the circuit at the service equipment or at the source of a separately derived system.Ground-fault circuit-interrupter. A device whose function is to interrupt the electric circuit to the load when a fault current to ground exceeds some predetermined value that is less than that required to operate the overcurrent protective device of the supply circuit.Guarded. Covered, shielded, fenced, enclosed, or otherwise protected by means of suitable covers, casings, barriers, rails, screens, mats, or platforms to remove the likelihood of approach to a point of danger or contact by persons or objects.Heating equipment. For the purposes of 1910.306(g), the term "heating equipment" includes any equipment used for heating purposes if heat is generated by induction or dielectric methods.Hoistway. Any shaftway, hatchway, well hole, or other vertical opening or space in which an elevator or dumbwaiter is designed to operate.Identified. Identified, as used in reference to a conductor or its terminal, means that such conductor or terminal can be readily recognized as grounded.Interrupter switch. (Over 600 volts, nominal.) A switch capable of making, carrying, and interrupting specified currents.Irrigation machine. An irrigation machine is an electrically driven or controlled machine, with one or more motors, not hand portable, and used primarily to transport and distribute water for agricultural purposes.Isolated. Not readily accessible to persons unless special means for access are used.Isolated power system. A system comprising an isolating transformer or it equivalent, a line isolation monitor, and its ungrounded circuit conductors.Labeled. Equipment is "labeled" if there is attached to it a label, symbol, or other identifying mark of a nationally recognized testing laboratory which, (a) makes periodic inspections of the production of such equipment, and (b) whose labeling indicates compliance with nationally recognized standards or tests to determine safe use in a specified manner.Lighting outlet. An outlet intended for the direct connection of a lampholder, a lighting fixture, or a pendant cord terminating in a lampholder.Listed. Equipment is "listed" if it is of a kind mentioned in a list which, (a) is published by a nationally recognized laboratory which makes periodic inspection of the production of such equipment, and (b) states such equipment meets nationally recognized standards or has been tested and found safe for use in a specified manner.Location - (i) Damp location. Partially protected locations under canopies, marquees, roofed open porches, and like locations, and interior locations subject to moderate degrees of moisture, such as some basements, some barns, and some cold-storage warehouses.(ii) Dry location. A location not normally subject to dampness or wetness. A location classified as dry may be temporarily subject to dampness or wetness, as in the case of a building under construction.(iii) Wet location. Installations underground or in concrete slabs or masonry in direct contact with the earth, and locations subject to saturation with water or other liquids, such as vehicle-washing areas, and locations exposed to weather and unprotected.May. If a discretionary right, privilege, or power is abridged or if an obligation to abstain from acting is imposed, the word "may" is used with a restrictive "no," "not," or "only." (E.g., no employer may ...; an employer may not ...; only qualified persons may ...)Medium voltage cable. Type MV medium voltage cable is a single or multiconductor solid dielectric insulated cable rated 2000 volts or higher.Metal-clad cable. Type MC cable is a factory assembly of one or more conductors, each individually insulated and enclosed in a metallic sheath of interlocking tape, or a smooth or corrugated tube.


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Mineral-insulated metal-sheathed cable. Type MI mineral-insulated metal-sheathed cable is a factory assembly of one or more conductors insulated with a highly compressed refractory mineral insulation and enclosed in a liquid tight and gastight continuous copper sheath.Mobile X-ray. X-ray equipment mounted on a permanent base with wheels and/or casters for moving while completely assembled.Nonmetallic-sheathed cable. Nonmetallic-sheathed cable is a factory assembly of two or more insulated conductors having an outer sheath of moisture resistant, flame-retardant, nonmetallic material. Nonmetallic sheathed cable is manufactured in the following types:(i) Type NM. The overall covering has a flame-retardant and moisture-resistant finish.(ii) Type NMC. The overall covering is flame-retardant, moisture-resistant, fungus-resistant, and corrosion-resistant.Oil (filled) cutout. (Over 600 volts, nominal.) A cutout in which all or part of the fuse support and its fuse link or disconnecting blade are mounted in oil with complete immersion of the contacts and the fusible portion of the conducting element (fuse link), so that arc interruption by severing of the fuse link or by opening of the contacts will occur under oil.Open wiring on insulators. Open wiring on insulators is an exposed wiring method using cleats, knobs, tubes, and flexible tubing for the protection and support of single insulated conductors run in or on buildings, and not concealed by the building structure.Outlet. A point on the wiring system at which current is taken to supply utilization equipment.Outline lighting. An arrangement of incandescent lamps or electric discharge tubing to outline or call attention to certain features such as the shape of a building or the decoration of a window.Oven, wall-mounted. An oven for cooking purposes designed for mounting in or on a wall or other surface and consisting of one of more heating elements, internal wiring, and built-in or separately mountable controls. (See Cooking unit, counter-mounted.)Overcurrent. Any current in excess of the rated current of equipment or the ampacity of a conductor. It may result from overload (see definition), short circuit, or ground fault. A current in excess of rating may be accommodated by certain equipment and conductors for a given set of conditions. Hence the rules for overcurrent protection are specific for particular situations.Overload. Operation of equipment in excess of normal, full load rating, or of a conductor in excess of rated ampacity which, when it persists for a sufficient length of time, would cause damage or dangerous overheating. A fault, such as a short circuit or ground fault, is not an overload. (See Overcurrent.)Panelboard. A single panel or group of panel units designed for assembly in the form of a single panel; including buses, automatic overcurrent devices, and with or without switches for the control of light, heat, or power circuits; designed to be placed in a cabinet or cutout box placed in or against a wall or partition and accessible only from the front. (See Switchboard.)Portable X-ray. X-ray equipment designed to be hand-carried.Power and control tray cable. Type TC power and control tray cable is a factory assembly of two or more insulated conductors, with or without associated bare or covered grounding conductors under a nonmetallic sheath, approved for installation in cable trays, in raceways, or where supported by a messenger wire.Power fuse. (Over 600 volts, nominal.) See Fuse.Power-limited tray cable. Type PLTC nonmetallic-sheathed power limited tray cable is a factory assembly of two or more insulated conductors under a nonmetallic jacket.Power outlet. An enclosed assembly which may include receptacles, circuit breakers, fuseholders, fused switches, buses and watt-hour meter mounting means; intended to supply and control power to mobile homes, recreational vehicles or boats, or to serve as a means for distributing power required to operate mobile or temporarily installed equipment.Premises wiring system. That interior and exterior wiring, including power, lighting, control, and signal circuit wiring together with all of its associated hardware, fittings, and wiring devices, both permanently and temporarily installed, which extends from the load end of the service drop, or load end of the service lateral conductors to the outlet(s). Such wiring does not include wiring internal to appliances, fixtures, motors, controllers, motor control centers, and similar equipment.Qualified Electrician. One who has demonstrated their knowledge of the National Electrical Code, State and Local Regulations regarding electrical installations and public safety through training and evaluations. Depending upon the type and location of the location of the electrical installation this person may be required to hold a license issued by the State or Locality where the work is being performed.Electrical Program 2015


Qualified person. One familiar with the construction and operation of the equipment and the hazards involved.Note 1: Whether an employee is considered to be a "qualified person" will depend upon various circumstances in the workplace. It is possible and, in fact, likely for an individual to be considered qualified" with regard to certain equipment in the workplace, but "unqualified" as to other equipment.(See 1910.332(b)(3) for training requirements that specifically apply to qualified persons.)Note 2: An employee who is undergoing on-the-job training and who, in the course of such training, has demonstrated an ability to perform duties safely at his or her level of training and who is under the direct supervision of a qualified person is considered to be a qualified person for the performance of those duties.Raceway. A channel designed expressly for holding wires, cables, or busbars, with additional functions as permitted in this subpart. Raceways may be of metal or insulating material, and the term includes rigid metal conduit, rigid nonmetallic conduit, intermediate metal conduit, liquidtight flexible metal conduit, flexible metallic tubing, flexible metal conduit, electrical metallic tubing, underfloor raceways, cellular concrete floor raceways, cellular metal floor raceways, surface raceways, wireways, and busways.Readily accessible. Capable of being reached quickly for operation, renewal, or inspections, without requiring those to whom ready access is requisite to climb over or remove obstacles or to resort to portable ladders, chairs, etc. (See Accessible.)Receptacle. A receptacle is a contact device installed at the outlet for the connection of a single attachment plug. A single receptacle is a single contact device with no other contact device on the same yoke. A multiple receptacle is a single device containing two or more receptacles.Receptacle outlet. An outlet where one or more receptacles are installed.Remote-control circuit. Any electric circuit that controls any other circuit through a relay or an equivalent device.Sealable equipment. Equipment enclosed in a case or cabinet that is provided with a means of sealing or locking so that live parts cannot be made accessible without opening the enclosure. The equipment may or may not be operable without opening the enclosure.Separately derived system. A premises wiring system whose power is derived from generator, transformer, or converter winding and has no direct electrical connection, including a solidly connected grounded circuit conductor, to supply conductors originating in another system.Service. The conductors and equipment for delivering energy from the electricity supply system to the wiring system of the premises served.Service cable. Service conductors made up in the form of a cable.Service conductors. The supply conductors that extend from the street main or from transformers to the service equipment of the premises supplied.Service drop. The overhead service conductors from the last pole or other aerial support to and including the splices, if any, connecting to the service-entrance conductors at the building or other structure.Service-entrance cable. Service-entrance cable is a single conductor or multiconductor assembly provided with or without an overall covering, primarily used for services and of the following types:(i) Type SE, having a flame-retardant, moisture-resistant covering, but not required to have inherent protection against mechanical abuse.(ii) Type USE, recognized for underground use, having a moisture-resistant covering, but not required to have a flame-retardant covering or inherent protection against mechanical abuse. Single-conductor cables having an insulation specifically approved for the purpose do not require an outer covering.Service-entrance conductors, overhead system. The service conductors between the terminals of the service equipment and a point usually outside the building, clear of building walls, where joined by tap or splice to the service drop.Service entrance conductors, underground system. The service conductors between the terminals of the service equipment and the point of connection to the service lateral. Where service equipment is located outside the building walls, there may be no service-entrance conductors, or they may be entirely outside the building.Service equipment. The necessary equipment, usually consisting of a circuit breaker or switch and fuses, and their accessories, located near the point of entrance of supply conductors to a building or other structure, or an otherwise defined area, and intended to constitute the main control and means of cutoff of the supply.Service raceway. The raceway that encloses the service-entrance conductors.Shielded nonmetallic-sheathed cable. Type SNM, shielded nonmetallic-sheathed cable is a factory assembly of two or more insulated conductors in an extruded core of moisture-resistant, flame-resistant nonmetallic material,


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covered with an overlapping spiral metal tape and wire shield and jacketed with an extruded moisture-, flame-, oil-, corrosion-, fungus-, and sunlight-resistant nonmetallic material.Show window. Any window used or designed to be used for the display of goods or advertising material, whether it is fully or partly enclosed or entirely open at the rear and whether or not it has a platform raised higher than the street floor level.Sign. See Electric Sign.Signaling circuit. Any electric circuit that energizes signaling equipment.Special permission. The written consent of the authority having jurisdiction.Storable swimming or wading pool. A pool with a maximum dimension of 15 feet and a maximum wall height of 3 feet and is so constructed that it may be readily disassembled for storage and reassembled to its original integrity.Switchboard. A large single panel, frame, or assembly of panels which have switches, buses, instruments, overcurrent and other protective devices mounted on the face or back or both. Switchboards are generally accessible from the rear as well as from the front and are not intended to be installed in cabinets. (See Panelboard.)Switches.General-use switch. A switch intended for use in general distribution and branch circuits. It is rated in amperes, and it is capable of interrupting its rated current at its rated voltage.(ii) General-use snap switch. A form of general-use switch so constructed that it can be installed in flush device boxes or on outlet box covers, or otherwise used in conjunction with wiring systems recognized by this subpart.(iii) Isolating switch. A switch intended for isolating an electric circuit from the source of power. It has no interrupting rating, and it is intended to be operated only after the circuit has been opened by some other means.(iv) Motor-circuit switch. A switch, rated in horsepower, capable of interrupting the maximum operating overload current of a motor of the same horsepower rating as the switch at the rated voltage.Switching devices. (Over 600 volts, nominal.) Devices designed to close and/or open one or more electric circuits. Included in this category are circuit breakers, cutouts, disconnecting (or isolating) switches, disconnecting means, interrupter switches, and oil (filled) cutouts.Transportable X-ray. X-ray equipment installed in a vehicle or that may readily be disassembled for transport in a vehicle.Utilization equipment. Utilization equipment means equipment which utilizes electric energy for mechanical, chemical, heating, lighting, or similar useful purpose.Utilization system. A utilization system is a system which provides electric power and light for employee workplaces, and includes the premises wiring system and utilization equipment.Ventilated. Provided with a means to permit circulation of air sufficient to remove an excess of heat, fumes, or vapors.Volatile flammable liquid. A flammable liquid having a flash point below 38 degrees C (100 degrees F) or whose temperature is above its flash point.Voltage (of a circuit). The greatest root-mean-square (effective) difference of potential between any two conductors of the circuit concerned.Voltage, nominal. A nominal value assigned to a circuit or system for the purpose of conveniently designating its voltage class (as 120/240, 480Y/277, 600, etc.). The actual voltage at which a circuit operates can vary from the nominal within a range that permits satisfactory operation of equipment.Voltage to ground. For grounded circuits, the voltage between the given conductor and that point or conductor of the circuit that is grounded; for ungrounded circuits, the greatest voltage between the given conductor and any other conductor of the circuit.Watertight. So constructed that moisture will not enter the enclosure.Weatherproof. So constructed or protected that exposure to the weather will not interfere with successful operation. Rainproof, raintight, or watertight equipment can fulfill the requirements for weatherproof where varying weather conditions other than wetness, such as snow, ice, dust, or temperature extremes, are not a factor.


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Attachment B

Health & Safety Procedures

Approved: Management Date:2015

Page: 1 of 3

PROCEDURE: Grounding of Portable Generators

PURPOSE: To describe the action necessary for properly grounding of portable generators.

ACTION:

Much confusion and controversy surrounds grounding and ground fault circuit interrupter (GFCI) requirements for small portable and vehicle-mounted generators. Much of this confusion is due to the way the term grounding is used in the National Electrical Code (NEC) and OSHA regulations. The three defined functions are:

1) Equipment grounding, which involves connecting all enclosures together via the green wire and conduits between enclosures. If properly executed and maintained, this process has two results:

It prevents dangerous voltage between enclosures. It provides a low-impedance path so that fault current will be high enough to trip a circuit

breaker or blow a fuse.2) System grounding. As used here, the term system refers to the set of actual (live) current-carrying

conductors from source to loads. Therefore, a grounded system is one with a main “bonding jumper” connecting the current-carrying conductor to the enclosure at the source, creating the grounded conductor (the white wire). The main bonding jumper goes only to the grounding terminal in the source enclosure, not to earth /water piping. This process completes the path from the collective equipment-grounding conductor to the system’s grounded conductor, which completes the grounded-fault path or “loop.” The ground fault loop starts at one output terminal (transformer or generator), runs out over one “hot” conductor (i.e., the black wire), finds the fault, and returns to the source over the equipment grounding conductor, where it finds the main bonding jumper to the source’s other terminal. This loop clears ground faults without involving any connection to a grounding electrode (i.e., the earth). Ground-fault protection is accomplished by connecting things together, not to earth.

3) The third function of grounding has nothing to do with clearing ground faults. Among earth, water piping and building steel, none have low enough impedance to pass the high fault current necessary to dependably operate over-current devices. A grounding electrode conductor is needed to protect against intruding voltages (lightning, accidental high-voltage cross, transformer inter-winding failure, etc.). It connects the entire electrical installation to its surroundings in order to prevent dangerous voltages between electrical enclosures and building steel, piping, earth etc.


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If equipment and system grounding have been properly executed, ground faults will be cleared whether or not a grounding electrode is installed. In the case of small portable generators, the possibility of any of these intruding voltages is so remote that the electrode connection, which can be expensive, is not required.

With these clarifications in mind, questions surrounding portable generators are more easily answered. Relevant requirements are essentially the same for vehicle-mounted generators. In addition, OSHA requirements and the NEC are quite similar; therefore, references here are made to the NEC.


Approved: Management Date: 2015

Page: 2 of 3


To minimize the possibility of multiple ground faults and other complications, the generator should supply only equipment mounted on the generator or connected via receptacles on the generator. This restriction eliminates use of panels or connection clusters to subfeed cords and tools. In addition, output cannot be connected to fixed wiring.

NEC 250-6(a) and (b) state that with this limitation, and if all equipment supplied from the generator is properly bonded to the generator frame (equipment grounding) via the green wire and grounding-type receptacles, the “frame shall be permitted to serve as the grounding electrode.” Note that this covers functions 1 (equipment grounding required) and 3 (grounding electrode not required).

NEC 250-6(c) requires that a “neutral conductor (if one exists) shall be grounded to the generator frame.” Therefore, in 240/120-volt (three-wire) generators with a neutral conductor, that conductor must be grounded through a main bonding jumper in the generator. However, because a two-wire, 120-volt generator has no neutral, neither conductor must be grounded. Because generators are equipped with different output arrangements, the user must determine whether an isolated two-wire, 120-volt output exists.

Under NEC 305-6(a), receptacles on construction sites must provide redundant ground-fault protection to people (in addition to the equipment-grounding conductor). The exception applies only to small portable generators that have:

1) No more than five kilowatt (kW) output;2) Two-wire, 120-volt, single-phase ungrounded (“isolated”) output.

These criteria ensure that even if a person standing in a puddle holds a tool with a ground fault, s/he will not receive a shock because no path will be available for the ground-fault current to return to the source and complete the ground-fault loop. Current will only flow if it finds a complete loop from the source through the person, earth, piping, etc., back through the main bonding jumper. If no main bonding jumper exists, this cannot occur. For the same reason, a GFCI cannot work on this circuit and, therefore, is not required.

However, one must ensure that generator output is truly isolated, as variations and field alterations can provide this main bonding jumper. In such cases, the person can be shocked; therefore, a GFCI will work and must be used. To verify isolation, a qualified person must test for continuity between the two output slots (in a receptacle) and the generator frame. This test must show infinite resistance (no connection). Voltmeters and most three-wire circuit testers, which draw power from the generator, provide dependable results. In addition, one should check the required connection between the grounding slot of each receptacle to the generator frame.


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Following is a field checklist:

1) Check the generator nameplate for this information: Not more than five kW; Output voltage two-wire, 120 volts only.

2) Verify that output is truly isolated. If so, a GFCI is not required.


Approved: Management Date: 2015

Page: 3 of 3


3) Output voltage three-wire, 240/120 volts. This system has a neutral that should be grounded; therefore, a GFCI is required.

4) Some generators have separate 240-volt winding feeding 240-volt receptacles, and separate 120-volt winding (which must be isolated) feeding 120-volt receptacles. Test 120-volt receptacles only to verify output isolation. If isolated, these receptacles don’t require GFCI protection.

5) OSHA § 1910.334(a)(4) covers use of portable tools in wet environments. GFCI protection may be appropriate.

6) OSHA § 1910.268 (i)(5),(i)(6) covers use of portable tools in telecommunications. GFCI protection may be appropriate.

As noted, GFCIs may not be required on some small generators. However, to take advantage of this exception, one must verify output isolation. Tests must be performed whenever a main bonding jumper may have been (or potentially could be) added. Some inspectors require that these jumpers be added. Therefore, when generators are used on several shifts or in different locations, one cannot assume isolation. Thus, GFCI protection should be used voluntarily in order to eliminate the test for isolation while ensuring employee safety.


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Attachment C


Approved: Management Date:2015

Page: 1 of 1

PROCEDURE: Installation of Interrupter

PURPOSE: To describe the action necessary for properly installing an interrupter.

ACTION:

SAFETY HAZARDS:

High Voltage Bad Grounding

SAFETY PRECAUTIONS:

Check with meter for power “off” Check all connection insulate all exposed connections

1) Visually inspect ground wire to rectifier case

2) Open rectifier

3) Turn off A.C. power to rectifier

4) Disconnect D.C. lead to pipeline or anode

5) Connect lead to interrupter to rectifier.

6) Connect other lead from interrupter to rectifier.

7) Test interrupter and sync if necessary

8) Re-energize rectifier


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Attachment D


Approved: management Date:2015

Page: 1 of 1

PROCEDURE: Transformer Rectifier Installation

PURPOSE: To describe the action necessary for properly installing a transformer rectifier.

ACTION:SAFETY HAZARDS:

1) Welding burn to the eyes and skin2) Moving rectifiers of large size and weight3) Electrical shock from the A.C. line4) Electrical shock from the D.C. rectifier output.

SAFETY PRECAUTIONS:

1) Wear proper protective clothing to prevent burns.2) Use appropriate lifting devices/sufficient number of men for moving and

mounting large rectifiers.3) Assure all A.C. power is off with proper lock out Tag out procedures.4) Pay careful attention to methods used to determine rectifier efficiency so

as not to subject yourself to D.C. or A.C. shocks.Procedure:

1) Weld mounting bolts/channel to structure

2) Mount rectifier to bolts and secure

3) Lockout and tag appropriate A.C.

4) Install A.C. and D.C. conduits into rectifier

5) Make internal A.C. and D.C. wiring connections

6) Restore power

7) Test rectifier for proper operation.


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Electrical Standards for Construction Safety_Elect… · Web viewCONTROL LLC. Date. 2019...

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Transcript of Electrical Standards for Construction Safety_Elect… · Web viewCONTROL LLC. Date. 2019...