The Association of Electrical Equipment and Medical Imaging Manufacturers ENCLOSURE TYPES...

The Association of Electrical Equipment and Medical Imaging Manufacturers

ENCLOSURE TYPES

Environmental Conditions

and the Appropriate::


Understanding the Environment

Indoors / Outdoors

Water -- Drip / Rain / Hose / Submersion / Ice

Dust -- Settling, Circulating, or Windblown Dust

Corrosive Liquids / Oil / Noncorrosive Liquids

Hazardous Location -- Gas / Combustible Dust


•Common To All Enclosures

Provide A Degree Of Protection To Personnel Against Incidental Contact With The Enclosed Equipment

Rod Test: NEMA 1, 2, 3R


•Driptight - Falling dirt or moisture will not enter

the enclosure

•Dusttight - Circulating or airborne dust will not

enter the enclosure•Rainproof -

Exposure to beating rain will not interfere with the operation of the apparatus or result in wetting of live parts and wiring within the enclosure

Definitions


•Raintight - Exposure to beating rain will not

result in entrance of water

•Watertight - Water will not enter enclosure when

subjected to a stream of water

Definitions


•Indoor Use•General Purpose (Not Exposed To Unusual Conditions)

•Degree of Protection From Falling Dirt

Type 1


•Indoor Use

•Degree Of Protection From:

Falling Dirt Dripping Non-

Corrosive Liquid

Light Splashing of Non-Corrosive Liquid

Type 2


•Indoor or Outdoor Use

•Degree of Protection From: Falling Dirt, Rain, Sleet, and

Snow Windblown Dust

•Undamaged by the External Formation of Ice.

Type 3



•Degree of Protection From:

Falling Dirt, Rain, Sleet, and Snow

•Not Dustproof, Snowproof, or Sleetproof

•Undamaged by the External Formation of Ice

Type 3R




Falling Dirt, Rain, Sleet, Snow, and Windblown Dust

•External Mechanism(s) remain Operable When Ice Laden

Type 3S




Windblown Dust and Rain

Splashing Water Hose Directed Water Undamaged by the

External Formation of Ice

Type 4


Windblown Dust and Rain

Splashing Water Hose Directed

Water Damage from

External Ice Formation

Corrosion Resistive



Type 4X


•Indoor Use


Falling Dirt, Settling Airborne Dust, Lint, Fibers, and Flyings

Dripping and Light Splashing of Noncorrosive Liquids

Type 5




Falling Dirt Hose Directed Water Damage From External

Ice Formation Entry of Water During

Occasional Temporary Submersion at a Limited Depth

Type 6



•Degree of Protection From: Falling Dirt Hose Directed Water Damage From External Ice

Formation Entry of Water During Prolonged

Submersion at a Limited Depth

Type 6P


Indoor use in locations classified as Class I, Groups A, B, C, or D, as defined in the NEC®.

Protection against Hazardous Location atmospheres containing Gases and Vapors.

Type 7


Indoor or Outdoor use in locations classified as Class I, Groups A, B, C, or D, as defined in the NEC®.

Protection against Hazardous Location atmospheres containing Gases and Vapors.

Arcing contacts, connections, … are immersed in oil in order to confine ignition source.

Type 8


Indoor use in locations classified as Class II, Groups E, F, or G, as defined in the NEC®.

Protection against Hazardous Location atmospheres containing Dust.

Type 9


Capable of meeting the requirements of the (MSHA) Mine Safety and Health Administration, 30 C.F.R., Part 18.

Type 10


Indoor use primarily to provide a degree of protection against:

• Circulating Dust

• Falling Dirt

• Dripping Noncorrosive Liquid• Circulating Lint, Fibers and Flyings (Nonhazardous and not considered Class III Type ignitable fibers or flyings)

Type 12 with Knockouts

Type 12

Type 12K


Indoor or Outdoor use primarily to provide a degree of protection against:

•Dust

•Spraying of Water, Oil, and Noncorrosive Coolant

•Oil and Coolant Seepage

Type 13


Comparison of Indoor Enclosure Applications

Enclosure Type

Condition of Protection 1 2 4 4X 5 6 6P 12(K) 13

Falling Dirt X X X X X X X X X

Falling Liquids and Light Splashings -- X X X X X X X X

Circulating dust, lint, fibers, & flyings -- -- X X -- X X X X

Settling airborne dust, lint, fibers & flyings* -- -- X X X X X X X

Hosedown and Splashing water -- -- X X -- X X -- --

Oil and Coolant seepage -- -- -- -- -- -- -- X X

Oil or Coolant spraying and splashing -- -- -- -- -- -- -- -- X

Corrosive Agents -- -- -- X -- -- X -- --

Occasional Temporary Submersion -- -- -- -- -- X X -- --

Occasional Prolonged Submersion -- -- -- -- -- -- X -- --

* These fibers and flyings are nonhazardous materials and are not

considered Class III type ignitable fibers or combustibles flyings

Table: NEMA 250


Comparison of Outdoor Enclosure Applications

Enclosure Type

Condition of Protection 3 3R 3S 4 4X

Rain, snow, sleet X X X X X

Sleet (External Operating Mech. Operable w/ ice) -- -- X -- --

Windblown dust X -- X X X

Hosedown -- -- -- X X

Corrosive Agents -- -- -- -- X

Table: NEMA 250

The Association of Electrical Equipment and Medical Imaging Manufacturers Comparison of Indoor Enclosure

Applications for Hazardous Locations

Table: NEMA 250

See NFPA 497M for complete listing of atmosphere classifications

NFPA 496, Purged and Pressurized Enclosures ..., outlines alternatives to

Type 7 & 9 Enclosures when adequate positive pressure ventilation is used.

Type 7 & 8 Type 9

Atmosphere Containing: Class A B C D E F G 10

Acetylene I X -- -- -- -- -- -- --

Hydrogen, manufactured gas I -- X -- -- -- -- -- --

Diethel ether, ethylene, cyclopropane I -- -- X -- -- -- -- --

Gasoline, hexane, butane, naphtha,

propane,acetone,toluene, isoprene I -- -- -- X -- -- -- --

Metal dust II -- -- -- -- X -- -- --

Carbon black, coal dust, coke dust II -- -- -- -- -- X -- --

Flour, starch, grain dust II -- -- -- -- -- -- X --

Fiber flyings III -- -- -- -- -- -- X --

Methane with or without coal dust MSHA -- -- -- -- -- -- -- X


•European System of specifying the degree of protection provided by the enclosure.

•NEC® does not accept IP designations as an alternative for Type ratings.

•IEC 60529 does not address mechanical damage, risk of explosion, or corrosion.

•UL 50E and NEMA 250 do evaluate mechanical characteristics such as corrosion, icing, oil, …

IEC Enclosure Designations


Example: IP10•The IEC designation consists of the letters IP followed by two numerals.

•The first numeral indicates the degree of protection provided against persons and solid foreign objects entering the enclosure.

•The second numeral indicates the degree of protection provided against the harmful ingress of water into the enclosure.

IEC Enclosure Designations


NEMA Enclosure Type IP Second

Character

IP First

Character 1 2 3 3R 3S 4 4X 5 6 6P 12 12K 13

IP0_ IP_0 IP1_ IP_1 IP2_ IP_2 IP3_ IP_3 IP4_ IP_4 IP5_ IP_5 IP6_ IP_6

IP_7 IP_8 A B A B A B A B A B A B A B A B A B A B A B A B A B

A = A shaded block in the “A” column indicates that the NEMA Enclosure Type exceeds the

requirements for the respective IEC 60529 IP First Character Designation. The IP First Character Designation is the protection against access to hazardous parts and solid foreign objects.

B = A shaded block in the “B” column indicates that the NEMA Enclosure Type exceeds the

requirements for the respective IEC 60529 IP Second Character Designation. The IP Second Character Designation is the protection against the ingress of water.

(This Table cannot be used to convert IEC IP Designations to NEMA Enclosure Types)

Conversion of NEMA Types to IEC IP

Designations


EXAMPLE OF TABLE USE An IEC IP 45 Enclosure Rating is specified. What NEMA Type Enclosures meet and exceed the IP 45 rating? Referencing the first character, 4, in the IP rating and the row designated “IP4_” in the leftmost column in the table; the blocks in Column “A” for NEMA Types 3, 3S, 4, 4X, 5, 6, 6P, 12, 12K and 13 are shaded. These NEMA ratings meet and exceed the IEC protection requirements against access to hazardous parts and solid foreign objects. Referencing the second character, 5, in the IP rating and the row designated “IP_5” in the rightmost column in the table; the blocks in Column “B” for NEMA Types 3, 3S, 4, 4X, 6 and 6P are shaded. These NEMA ratings meet and exceed the IEC requirements for protection against the ingress of water. The absence of shading in Column “B” beneath the “NEMA Enclosure Type 5” indicates that Type 5 does not meet the IP 45 protection requirements against the ingress of water. Likewise the absence of shading in Column “B” for NEMA Type 12, 12K and 13 enclosures indicates that these enclosures do not meet the IP 45 requirements for protection against the ingress of water. Only Types 3, 3S, 4, 4X, 6 and 6P have both Column “A” in the “IP4_” row and Column “B” in the “IP_5” row shaded and could be used in an IP45 application. The NEMA Enclosure Type 3 not only meets the IP 45 Enclosure Rating, but also exceeds the IEC requirements because the NEMA Type requires an outdoor corrosion test; a gasket aging test; a dust test; an external icing test; and no water penetration in the rain test. Slight differences exist between the IEC and NEMA test methods, but the IEC rating permits the penetration of water if “it does not deposit on insulation parts, or reach live parts.” The IEC rating does not require a corrosion test; gasket aging test; dust test or external icing test. Because the NEMA ratings include additional test requirements, this table cannot be used to select IP Designations for NEMA rated enclosure specifications. Since the IEC protection requirements become more stringent with increasing IP character value, once a NEMA rating meets the requirements for an IP designation, it will also meet the requirements for all lower IP designations. This is apparent from the shaded areas shown in the table.

Understanding the Enclosure Conversion Table

(The Table cannot be used to convert IEC IP Designations to NEMA Enclosure Types)


Multiple Types on Enclosure

Type 3, 3R, 4X, 5, 12

Stainless Steel or other materials approved

for the use (Corrosion Protection)

Gasketing (Dust and Water Protection)

Drain Plug (Remove for Type 3R)


UL 231 - Power Outlet

-Water Splash Test

-GFCI Requirements

NEC® Branch Circuits

590.4 Temporary Installations

555.19(A)(3) Marinas and

Boatyards

551.78(A) Recreational Vehicle

Parks

Power Outlet


•More Information?UL “White” BookElectrical Equipment For Use In Ordinary Locations, Page 133Hazardous Locations Equipment Directory, Page 101

NEMANEMA Standard 250-2013Global Publications (800) 854-7179

The Association of Electrical Equipment and Medical Imaging Manufacturers ENCLOSURE TYPES...

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