Eclipse Engineering Guide

NEMA ENCLOSURES
NEMA 1. General Purpose – Indoor
Sheet metal enclosures intended for indoor use. Primary purpose
is to prevent accidental personnel contact with enclosed
equipment, although they will also provide some protection
against falling dirt.
NEMA 2. Drip Proof – Indoor
Indoor enclosure that protects contents against falling noncorrosive
liquids and dirt. Must be equipped with a drain.
NEMA 3. Dust Tight, Raintight & Sleet-Resistant (Ice-
Resistant),
NEMA 3R. Rainproof & Sleet-Resistant (Ice-Resistant).
NEMA 3S. Dust Tight, Raintight & Sleet-Proof (Ice-Proof)
Outdoor enclosures for protection against windblown dust, rain
and sleet. All have provision for locking.
NEMA 4. Water Tight & Dust Tight – Indoor & Outdoor
Protect contents against splashing, seeping, falling, or hosedirected
water and severe external condensation. Commonly used
in food-processing plants where equipment hosedown is required.
NEMA 6. Submersible, Watertight, Dust Tight and Sleet (Ice)-
Resistant–Indoor & Outdoor
Capable of being submerged up to 30 minutes in up to 6 feet of
water without harm to the contents.
NEMA 7. Hazardous Locations – Indoor – Air Break
Equipment
Enclosures for use in atmospheres containing explosive gases
and vapors as defined in Class 1, Division I, Groups A, B, C or D
of the National Electrical Code. Enclosure must contain an internal
explosion without causing an external hazard. Construction
details vary with the nature of the explosive gas or vapor.
NEMA 8. Hazardous Locations – Indoor – Oil-Immersed
Equipment
Enclosures for oil-immersed circuit breakers in Class I,
Division I, Group A, B, C or D hazardous atmospheres.
NEMA 9. Hazardous Locations – Indoor – Air-Break
Equipment
Used in Class II, Division I, Group E, F, or G hazardous locations
as defined by the National Electrical Code. Enclosures are
designed to exclude combustible or explosive dusts.
NEMA 10. Mine Atmospheres
For use in mines containing methane or natural gas.
NEMA 11. Corrosion-Resistant and Drip Proof – Indoor
Indoor enclosures that protect contents from dripping, seepage
and external condensation of corrosive liquids, as well as corrosive
fumes.
NEMA 12. Industrial Use – Dust Tight & Drip Tight – Indoor
Protect enclosed equipment from lint, fibers, flyings, dust, dirt
and light splashing, seepage, dripping and external condensation
of noncorrosive liquids.
NEMA 13. Oil Tight & Dust Tight – Indoor
Protect enclosed equipment from lint, dust and seepage, external
condensation and spraying of water, oil, or coolant. They have
oil-resistant gaskets and must have provision for oiltight conduit
entry.
For more complete details on application and construction specifications
for NEMA Enclosures, refer to NEMA Standards
Publication No. ICS 6.
34
ELECTRIC MOTORS–
FULL LOAD CURRENT, AMPERES
Single
Three-Phase AC Motors
Induction Type –
Phase Squirrel Cage &
Horse AC Motors Wound-Rotor
Power 115V 230V 115V 230V 460V 575V
1/6 4.4 2.2 — — — —
1/4 5.8 2.9 — — — —
1/3 7.2 3.6 — — — —
1/2 9.8 4.9 4 2 1 .8
3/4 13.8 6.9 5.6 2.8 1.4 1.1
1 16 8 7.2 3.6 1.8 1.4
1-1/2 20 10 10.4 5.2 2.6 2.1
2 24 12 13.6 6.8 3.4 2.7
3 34 17 — 9.6 4.8 3.9
5 56 28 — 15.2 7.6 6.1
7-1/2 80 40 — 22 11 9
10 100 50 — 28 14 11
15 — — — 42 21 17
20 — — — 54 27 22
25 — — — 68 34 27
30 — — — 80 40 32
40 — — — 104 52 41
50 — — — 130 65 52
60 — — — 154 77 62
75 — — — 192 96 77
100 — — — 248 124 99
125 — — — 312 156 125
150 — — — 360 180 144
200 — — — 480 240 192