Class 1 Div 2 seal requirements
Class 1 Div 2 seal requirements
(OP)
My question is are you required to have seals on nema 4 boxs with terminal strip wiring, or rosemount transmitters 4-20ma wiring in a class 1 div. 2 area
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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Class 1 Div 2 seal requirements
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RE: Class 1 Div 2 seal requirements
There is differing opinions on the question of the transmitter seal. Many apply the exception to 501.105(B)(2) to the transmitter and say that the transmitter enclosure is not required to be of explosion proof construction and therefore seals are not required in the division 2 area.
Others say that while the maximum normal operating temperature of the transmitter is very likely to be below 80% of the auto ignition temperature of gasses involved it is possible under conditions of transmitter malfunction that the temperature will exceed the 80% value and that seals are required.
Most of the plants in my area take the first view on this and do not require seals for the transmitters.
RE: Class 1 Div 2 seal requirements
One other question what about lighting fixtures rated class 1 div.2 I don,t recall ever seeing seals on lighting in past plants I worked in and this plant does not have seals on lighting also is this O.K.
Thanks
Chass989
RE: Class 1 Div 2 seal requirements
RE: Class 1 Div 2 seal requirements
RE: Class 1 Div 2 seal requirements
Yes, in general seals are required at the classification boundaries. I took the question as asking about seals at each light fixture in the classified area.