antarctidaonline
Member
- Location
- Russia, Samara
Hi all.
I just beginned study NEC and have a lot of questions. I hope I will be modest enough not to annoy you too much, but there is one question which is really interesting for me.
Consider an usual Class I, Division 2 location ? for example, pump room with normally adequate ventilation, but which may failure.
NEC says 501.115(B)(1):
"Type required.
...
unless general-purpose enclosures are provided and any of the following apply:
and exception (4):
?The device is a solid state, switching control without contacts, where the surface temperature does not exceed 80 percent of the autoignition temperature in degrees Celsius of the gas or vapor involved.?
So, according to it, can I use general-purpose enclosure (maybe IP68) for solid state power contactor, even if it will control AC 220 V circuit?
It is absolutely unthinkable in our practice, in Russia. Dangerous location with 220 V (or any not-nonincendive circuit) ? is Exd and only Exd, without variants.
Does anybody does different? Or do I misunderstand NEC?
I just beginned study NEC and have a lot of questions. I hope I will be modest enough not to annoy you too much, but there is one question which is really interesting for me.
Consider an usual Class I, Division 2 location ? for example, pump room with normally adequate ventilation, but which may failure.
NEC says 501.115(B)(1):
"Type required.
...
unless general-purpose enclosures are provided and any of the following apply:
and exception (4):
?The device is a solid state, switching control without contacts, where the surface temperature does not exceed 80 percent of the autoignition temperature in degrees Celsius of the gas or vapor involved.?
So, according to it, can I use general-purpose enclosure (maybe IP68) for solid state power contactor, even if it will control AC 220 V circuit?
It is absolutely unthinkable in our practice, in Russia. Dangerous location with 220 V (or any not-nonincendive circuit) ? is Exd and only Exd, without variants.
Does anybody does different? Or do I misunderstand NEC?