Subpart K - Electrical
Transcript of Subpart K - Electrical
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OSHA OCCUPATIONAL SAFETY AND HEALTHADMINISTRATION
Subpart K - Electrical1926.403 General requirements
1926.403(a) Approval. “All electrical conductors and equipment shall be approved.”
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UNDERWRITERSLABORATORIES
ENCLOSED SWITCHIssue AK 3225
LISTED
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Subpart K - Electrical1926.403 General requirements
1926.403(b) “Examination, installation, and use of equipment-(1) Examination. “The employer shall ensure that electrical equipment is free from recognized hazards that are likely to cause death or serious physical harm to employees. Safety of equipment shall be determined on the basis of the following considerations:”
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OSHA OCCUPATIONAL SAFETY AND HEALTHADMINISTRATION
Subpart K - Electrical1926.403 General requirements
1926.403(b)(1)(i) “Suitability for installations and use in conformity with the provisions of this subpart. Suitability of equipment for an identified purpose may be evidenced by listing, labeling, or certification for that identified purpose.”
1926.403(b)(1)(ii) “Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus provided.”
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OSHA OCCUPATIONAL SAFETY AND HEALTHADMINISTRATION
Subpart K - Electrical1926.403 General requirements
1926.403(b)(1)(iii) “Electrical insulation.”
1926.403(b)(1)(iv) “Heating effects under conditions of use.”
1926.403(b)(1)(v) “Arcing effects.”
1926.403(b)(1)(vi) “Classification by type, size, voltage, current capacity, specific use.”
1926.403(b)(1)(vii) “Other factors which contribute to the practicable safeguarding of employees using or likely to come in contact with the equipment.”
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OSHA OCCUPATIONAL SAFETY AND HEALTHADMINISTRATION
Subpart K - Electrical1926.403 General requirements
1926.403(b)(2) Installation and use. “Listed, labeled, or certified equipment shall be installed and used in accordance with instructions included in the listing, labeling, or certification.”
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OSHA OCCUPATIONAL SAFETY AND HEALTHADMINISTRATION
Subpart K - Electrical1926.403 General requirements
1926.403(g) Marking. “Electrical equipment shall not be used unless the manufacturer’s name, trademark, or other descriptive marking by which the organization responsible for the product may be identified is placed on the equipment and unless other markings are provided giving voltage, current, wattage, or other ratings as necessary. The marking shall be of sufficient durability to withstand the environment involved.”
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Transformer Nameplate
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Motor Nameplate
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OSHA OCCUPATIONAL SAFETY AND HEALTHADMINISTRATION
Subpart K - Electrical1926.403 General requirements
1926.403(h)Identification of disconnecting means and circuits. “Each disconnecting means required by this subpart for motors and appliances shall be legibly marked to indicate its purpose, unless located and arranged so the purpose is evident. Each service, feeder, and branch circuit, at its disconnecting means or overcurrent device, shall be legibly marked to indicate its purpose, unless located and arranged so the purpose is evident. These markings shall be of sufficient durability to withstand the environment involved.”
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Subpart K - Electrical1926.403 General requirements
1926.403(i)(1)(i) Working clearances. Except as required or permitted elsewhere in this subpart, the dimension of the working space in the direction of access to live parts operating at 600 volts or less and likely to require examination, adjustment, servicing, or maintenance while alive shall not be less than indicated in Table K-1. In addition to the dimensions shown in Table K-1, workspace shall not be less than 30 inches wide in front of the electric equipment…………………………
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TABLE K-1 -- WORKING CLEARANCE
NOMINAL VOLTAGE TO GROUND (a) (b) (c)
0-150..............................…..... 3 3 3
151-600...................................... 3 3 ½ 4
1 Minimum clear distance may be 2 feet 6 inches for installationsbuilt prior to April 16, 1981.
2Conditions (a),(b), and (c) are as follows:
(a) Exposed live parts on one side and no live or grounded parts on the other side of the working space, or exposed live parts on both sides effectively guarded by suitable wood or other insulating material. Insulated wire or insulated busbars operating at not over 300 volts are not considered live parts.
(b) Exposed live parts on one side and grounded parts on the other side.
(c) Exposed live parts on both sides of the workspace [not guarded as provided in Condition (a)] with the operator between.
General Requirements
Minimum clear distance for conditions1
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OSHA OCCUPATIONAL SAFETY AND HEALTHADMINISTRATION
Subpart K - Electrical1926.403 General requirements
1926.403(i)(2) Guarding of live parts. (i) “Except as required or permitted elsewhere in this subpart, live parts of electric equipment operating at 50 volts or more shall be guarded against accidental contact by cabinets or other forms of enclosures, or by any of the following means:”
1926.403(i)(2)(i)(A) “By location in a room, vault, or similar enclosure that is accessible only to qualified persons.”
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Subpart K - Electrical1926.403 General requirements
1926.403(i)(2)(i)(B) “By partitions or screens so arranged that only qualified persons will have access to the space within reach of the live parts. Any openings in such partitions or screens shall be so sized and located that persons are not likely to come into accidental contact with the live parts or to bring conducting objects into contact with them.”
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Subpart K - Electrical1926.403 General requirements
1926.403(i)(2)(i)(C) “By location on a balcony, gallery, or platform so elevated and arranged as to exclude unqualified persons.”
1926.403(i)(2)(i)(D) “By elevation of 8 feet or more above the floor or other working surface and so installed as to exclude unqualified persons.”
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OSHA OCCUPATIONAL SAFETY AND HEALTHADMINISTRATION
Subpart K - Electrical1926.404 Wiring design and protection
1926.404(a) Use and identification of grounded and grounding conductors-(1) Identification of conductors. “A conductor used as a grounded conductor shall be identifiable and distinguishable from all other conductors. A conductor used as an equipment grounding conductor shall be identifiable and distinguishable from all other conductors.”
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Subpart K - Electrical1926.404 Wiring design and protection
1926.404(a)(2) Polarity of connections. “No grounded conductor shall be attached to any terminal or lead so as to reverse designated polarity.”
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120 V
120 V
240 V
HOT WIRE
GROUNDED WIRE
HOT WIRE
SYSTEM GROUNDAT TRANSFORMERON UTILITY POLE
TRANSFORMERSECONDARY
SERVICE HEAD
METER
TERMINALBLOCK
WHITE
BARE
BLACK
BREAKERS
Wiring Diagram
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Subpart K - Electrical1926.404 Wiring design and protection
1926.404(b) Branch circuits – (1) Ground-fault protection – (i) General. “The employer shall use either ground fault circuit interrupters as specified in paragraph (b)(1)(ii) of this section or an assured equipment grounding conductor program as specified in paragraph (b)(1)(iii) of this section to protect employees on construction sites. These requirements are in addition to any other requirements for equipment grounding conductors.”
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OSHA OCCUPATIONAL SAFETY AND HEALTHADMINISTRATION
Subpart K - Electrical1926.404 Wiring design and protection
1926.404(b)(1)(ii) Ground-fault circuit interrupters. “All 120-volt, single-phase, 15- and 20-ampere receptacle outlets on construction sites, which are not a part of the permanent wiring of the building or structure and which are in use by employees, shall have approved ground-fault circuit interrupters for personnel protection. Receptacles on a two-wire, single phase portable or vehicle mounted generator rated not more than 5kW, where the circuit conductors of the generator are insulated from the generator frame and all other grounded surfaces, need not be protected with ground-fault circuit interrupters.”
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When do we test?
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In-Line GFCI
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OSHA OCCUPATIONAL SAFETY AND HEALTHADMINISTRATION
Subpart K - Electrical1926.404 Wiring design and protection
1926.404(b)(1)(iii) Assured equipment grounding conductor program. “The employer shall establish an assured equipment grounding conductor program on construction sites covering all cord sets, receptacles which are not a part of the building or structure and equipment connected by cord and plug which are available for use by employees. This program shall comply with the following minimum requirements:”
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OSHA OCCUPATIONAL SAFETY AND HEALTHADMINISTRATION
Subpart K - Electrical1926.404 Wiring design and protection
1926.404(b)(1)(iii)(A) “A written description of the program, including the specific procedures adopted by the employer, shall be available at the jobsite for inspection and copying by the Assistant Secretary and any affected employee.”
1926.404(b)(1)(iii)(B) “The employer shall designate one or more competent persons (as defined in 1926.32(f) to implement the program.”
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Subpart K - Electrical1926.404 Wiring design and protection
1926.404(b)(1)(iii)(C) “Each cord set, attachment cap, plug and receptacle of cord sets, and any equipment connected by cord and plug, except cord sets and receptacles which are fixed and not exposed to damage, shall be visually inspected before each day’s use for external defects, such as deformed or missing pins or insulation damage, and for indications of possible internal damage. Equipment found damaged or defective shall not be used until repaired.”
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Subpart K - Electrical1926.404 Wiring design and protection
1926.404(b)(1)(iii)(D) “The following tests shall be performed on all cord sets, receptacles which are not a part of the permanent wiring of the building or structure, and cord-and plug-connected equipment required to be grounded:”
1926.404(b)(iii)(D)(1) “All equipment grounding conductors shall be tested for continuity and shall be electrically continuous.”
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OSHA OCCUPATIONAL SAFETY AND HEALTHADMINISTRATION
Subpart K - Electrical1926.404 Wiring design and protection
1926.404(b)(1)(iii)(D)(2) “Each receptacle and attachment cap or plug shall be tested for correct attachment of the equipment grounding conductor. The equipment grounding conductor shall be connected to its proper terminal.”
1926/404(b)(1)(iii)(E) “All required tests shall be performed:”
1926.404(b)(1)(iii)(E)(1) “Before first use;”
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Subpart K - Electrical1926.404 Wiring design and protection
1926.404(b)(1)(iii)(E)(2) “Before equipment is returned to service following any repairs;
1926.404(b)(iii)(E)(3) “Before equipment is used after any incident which can be reasonably suspected to have caused damage (for example, when a cord set is run over); and”
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Subpart K - Electrical1926.404 Wiring design and protection
1926.404(b)(1)(iii)(E)(4) “At intervals not to exceed 3 months, except that cord sets and receptacles which are fixed and not exposed to damage shall be tested at intervals not exceeding 6 months.”
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OSHA OCCUPATIONAL SAFETY AND HEALTHADMINISTRATION
Subpart K - Electrical1926.404 Wiring design and protection
1926.404(f)(6) Grounding path. “The path to ground from circuits, equipment, and enclosures shall be permanent and continuous.”
1926.404(f)(7)(iv)(C)(6)…………………… Listed or labeled tools and appliances protected by a system of double insulation, or its equivalent, need not be grounded. If such a system is employed, the equipment shall be distinctively marked to indicate that the tool or appliance utilizes a system of double insulation.
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Marked Double Insulated
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Marked Double Insulated
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Marked Double Insulated
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Subpart K - Electrical1926.405 Wiring methods, components,
and equipment for general use1926.405(b)Cabinets, boxes, and fittings. (1) Conductors entering boxes, cabinets, or fittings. “Conductors entering boxes, cabinets, or fittings shall be protected from abrasion, and openings through which conductors enter shall be effectively closed. Unused openings in cabinets, boxes, and fittings shall also be effectively closed.”
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OSHA OCCUPATIONAL SAFETY AND HEALTHADMINISTRATION
Subpart K - Electrical1926.405 Wiring methods, components,
and equipment for general use1926.405(b)(2) Covers and canopies. “All pull boxes, junction boxes, and fittings shall be provided with covers. If metal covers are used, they shall be grounded. In energized installations each outlet box shall have a cover, faceplate, or fixture canopy. Covers of outlet boxes having holes through which flexible cord pendants pass shall be provided with bushings designed for the purpose or shall have smooth, well rounded surfaces on which the cords may bear.”
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OSHA OCCUPATIONAL SAFETY AND HEALTHADMINISTRATION
Subpart K - Electrical1926.405 Wiring methods, components,
and equipment for general use1926.405(g)(2)(ii) Marking. “Type SJ, SJO, SJT, SJTO, S, SO, ST, and STO cords shall not be used unless durably marked on the surface with the type designation, size, and number of conductors.”
1926.404(g)(2)(iii) Splices. “Flexible cords shall be used only in continuous lengths without splice or tap. Hard service flexible cords No. 12 or larger may be repaired if spliced so that the splice retains the insulation, outer sheath properties, and usage characteristics of the cord being spliced.”
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Don’t Use Flat Extension Cords
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Subpart K - Electrical1926.405 Wiring methods, components,
and equipment for general use
1926.405(g)(2)(iv) Strain relief. “Flexible cords shall be connected to devices and fittings so that strain relief is provided which will prevent pull from being directly transmitted to joints or terminal screws.”
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