rcwilson
Senior Member
- Location
- Redmond, WA
Contractor installed a security system in a gas compressor room running wiring in rigid conduit. Room is classified as Class 1 Div 2. These circuits are low voltage (power over ethernet) but not intrinsically safe. Conduit is appropriately sealed at Class 1 Div 2 to non-hazardous boundary. Equipment is all Class 1 Div 2 rated.
Some conduit runs are assembled with the C-H "HDG" 3-piece, concrete tight couplings that connect conduit without turning, like a union. These couplings are not listed in the catalogs as Class 1 Div 2. Some electricians on site are saying all the HDG couplings need to be replaced with explosion proof unions.
Contractor is quoting 501.10 B (4) "Boxes and fittings shall not be required to be explosion proof..." Per definitions, a coupling is a fitting.
Are these couplings suitable for this application? (I tried to find UL file E-19189 for the HDG coupling but haven't located it yet.)
Some conduit runs are assembled with the C-H "HDG" 3-piece, concrete tight couplings that connect conduit without turning, like a union. These couplings are not listed in the catalogs as Class 1 Div 2. Some electricians on site are saying all the HDG couplings need to be replaced with explosion proof unions.
Contractor is quoting 501.10 B (4) "Boxes and fittings shall not be required to be explosion proof..." Per definitions, a coupling is a fitting.
Are these couplings suitable for this application? (I tried to find UL file E-19189 for the HDG coupling but haven't located it yet.)