Dear Mr thronec (Industrial)(OP)17 Mar 21 19:35
T. " I was wondering if IP65 is the international equivalent to Class 1 Div 2 group B (hydrogen)? "
C. NO. IP65 is NOT the international equivalent to Class 1 Div 2 group B (hydrogen)
Che Kuan Yau (Singapore)
IP65 merely implies resistant to low pressure water jets, condensation, and water spray. It has nothing to do with flammability/explosivity/hazardous-location.
NEC 2017 Art.501.10 Wiring Methods (B) for class 1 division 2 states:
(4) Boxes and Fittings. Boxes and fittings shall not be required to be explosionproof except as required by 501.105(B)(2), 501.115(B)(1) , and 501.150(B)(1).
501.105 Meters, Instruments, and Relays.
501.115 Switches, Circuit Breakers, Motor Controllers, and Fuses.
501.150 Signaling, Alarm, Remote-Control, and Communications Systems.
So if the junction -or pull box-does not contain any of this devices you may use NEMA 4 [or 4x]. If it does, usually you need NEMA 7.However, there are conditions in which you may use still NEMA 4.See NEC art.501.105(B)(2), 501.115(B)(1) , and 501.150(B)(1).
In IEC land ATEX (Atmosperes Explosibles) is similar to the functional requirements of NEMA 7, and NEC listed location requirements. BUT NOT THE SAME. You can not meet the requirements of NFPA 70 (NEC) listed locations using ATEX equipment unless it also has a listing for the NEC application.
You also can not mix the Listed Location rules of the US National Electric Code with ATEX/IEC.
HOWEVER some equipment will be listed for both ATEX applications, and NEC listed locations. The equipment must pass the requirements of both sets of rules to carry this dual listing. This equipment could also carry an IP65 rating, but the IP 65 tells us nothing about the equipment's suitability for use in a hazardous (combustible) atmosphere.
IP 65 Protected from total dust ingress, Protected from low pressure water jets from any direction, limited ingress protection.
IP65 is similar to NEMA 4, or NEMA 6, but is not an exact match to either.
