NORTH AMERICAN HAZARD CATEGORY
ExampleNEC 500-503NEC 505
CLASS I
(Gases and Vapors) |
Acetylene
Hydrogen
Ethylene
Propane |
Group A
Group B
Group C
Group D |
IIC
IIC or IIB+H2
IIB
IIA |
CLASS II
(Dusts) |
Metal dust
Coal dust
Grain dust |
Group E
Group F
Group G |
|
AREA CLASSIFICATION
Continuous
hazardIntermittent
hazardHazard under
abnormal conditions
| NORTH AMERICA |
Division 1 |
Division 1 |
Division 2 |
IEC/CENELEC/EUROPE
/NEC505+ |
Zone 0
(Zone 20 dust) |
Zone 1
(Zone 21 dust) |
Zone 2
(Zone 22 dust) |
TEMPERATURE CLASSIFICATION
Max. surface
temp.(°C)NEC
Table500-3(d)IEC79-8
T ClassEN 50 014
| 450°C |
T1 |
T1 |
T1 |
| 300°C |
T2 |
T2 |
T2 |
| 280°C |
T2A |
-- |
-- |
| 260°C |
T2B |
-- |
-- |
| 230°C |
T2C |
-- |
-- |
| 215°C |
T2D |
-- |
-- |
| 200°C |
T3 |
T3 |
T3 |
| 180°C |
T3A |
-- |
-- |
| 165°C |
T3B |
-- |
-- |
| 160°C |
T3C |
-- |
-- |
| 135°C |
T4 |
T4 |
T4 |
| 120°C |
T4A |
-- |
-- |
| 100°C |
T5 |
T5 |
T5 |
| 85°C |
T6 |
T6 |
T6 |
INGRESS PROTECTION: (IP) CODES AND NEMA TYPES
FIRST NUMERAL
Protection against solid bodiesSECOND NUMERAL
Protection against liquid
| 0 - NO PROTECTION |
0 - NO PROTECTION |
| 1- OBJECTS EQUAL TO OR GREATER THAN 50 mm |
1 - VERTICALLY DRIPPING WATER |
| 2 - OBJECTS EQUAL TO OR GREATER THAN 12.5 mm |
2 - 75 TO 105°-ANGLED DRIPPING WATER |
| 3 - OBJECTS EQUAL TO OR GREATER THAN 2.5 mm |
3 - SPRAYING WATER |
| 4 - OBJECTS EQUAL TO OR GREATER THAN 1.0 mm |
4 - SPLASHING WATER |
| 5 - DUST-PROTECTED |
5 - WATER JETS |
| 6 - DUST-TIGHT |
6 - HEAVY SEAS, POWERFUL WATER JETS |
| |
7 - EFFECTS OF IMMERSION |
| |
8 - INDEFINITE IMMERSION |
NEMA and UL Types of Enclosures.
Type 3 Enclosure
Type 3 enclosures are intended for outdoor use primarily to provide a degree of protection against windblown dust, rain, sleet and external ice formation.
Type 3R Enclosure
Type 3R enclosures are intended for outdoor use primarily to provide a degree of protection against falling rain and external ice formation.
Type 3S Enclosure
Enclosures are intended for outdoor use primarily to provide a degree
of protection against rain, sleet, windblown dust, and to provide
for operation of external mechanisms when ice laden.
Type 4 Enclosure
Type 4 enclosures are intended for indoor or outdoor use primarily to provide a degree of protection against windblown dust and rain, splashing water, hose-directed water and external ice formation.
Type 4X Enclosure
Type 4X enclosures are intended for indoor or outdoor use primarily to provide a degree of protection against corrosion, windblown dust and rain, splashing water, hose-directed water and external ice formation.
Type 7 Enclosure
Type 7 enclosures are for use indoors in locations classified as Class I, Groups A, B, C or D, as defined in the National Electrical Code®.
Type 9 Enclosure
Type 9 enclosures are for use in indoor locations classified as Class II, Groups E, F or G, as defined in the National Electrical Code®.
Type 12 Enclosure
Type 12 enclosures are intended
for indoor use primarily to provide degree of protection against dust, falling dirt and dripping noncorrosive liquids. | 
