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Temperature classification
Another important consideration is the temperature classification of the electrical equipment. The surface temperature
or any parts of the electrical equipment that may be exposed to the hazardous atmosphere should be tested that it
does not exceed 80% of the auto-ignition temperature of the specific gas or vapor in the area where the equipment is
intended to be used.
The temperature classification on the electrical equipment label will be one of the followings (in degree Celsius):
USA °C
International
(IEC) °C
Germany °C
Continuous - Short Time
T1 - 450
T3A - 180
T1 - 450
G1: 360 - 400
T2 - 300
T3B - 165
T2 - 300
G2: 240 - 270
T2A - 280
T3C - 160
T3 - 200
G3: 160 - 180
T2B - 260
T4 - 135
T4 - 135
G4: 110 - 125
T2C - 230
T4A - 120
T5 - 100
G5: 80 - 90
T2D - 215
T5 - 100
T6 - 85
T3 - 200
T6 - 85
Table 1: Temperature Classification
What does it mean to have Class 1, Div 1, Zone 1 Certification?
A device that is designed for locations where flammable vapors are continuously present is designated with a CSA
Class 1, Div 1 certification and ATEX Zone 1 device. Those certified devices can be used in environments in which an
explosive atmosphere consisting of a mixture with air of dangerous substances in the form of gas, vapor or mist is
likely to occur in normal operation occasionally. It may be obvious, by now, that the correct designation is extremely
important for worker safety reasons. Failing to correctly designate a product can result in an injury or fatal disaster,
severe damage to both facilities and resources, and bring about legal ramifications or other risks. Of course, this
certification comes only after thorough and rigorous testing by experienced, independent third parties.
RealWear HMT-
1Z1 is the world’s first and only Class 1, Div 1, Zone 1 Certified Wearable Computing device which can
be safely used in such hazardous locations. Here are the current certifications for the RealWear HMT-1Z1:
ATEX
II 2G Ex ib IIC T4 Gb
II 2D Ex ib IIIC T135°C Db IP6X
IECEx
Ex ib IIC T4 Gb
Ex ib IIIC T135°C Db IP6X
NEC500
Class I, Division 1, Groups A,B,C,D T4
Class II & III, Division 1, Groups E,F,G
Table 2: RealWear Certifications (as of 5.25.18)