filterengineer
Member
- Location
- NC
I have a location rated Class II, Group G, Div 2, where we are installing power transformers, 3ph, 480/240 VAC, 150kvA. These are dry-type transformers. NEC 502.100 (B)(3) states that:
"Dry-type transformers shall be installed in vaults of have their windings and terminal connections enclosed in tight metal housings without ventilating or other openings and shall operate at not over 600 volts, nominal".
We prefer not to install these transformers in vaults, due to space limitations. I've tried to source these transformers but can't find a supplier that has them specifically rated for a Class II, Div 2 location. There are many out there rated for Class I, Div 2 locations, but that is for combustible gases/vapors, not combustible dust.
I'm sure others have run into this issue. Can someone advise of their approach?
Thanks
"Dry-type transformers shall be installed in vaults of have their windings and terminal connections enclosed in tight metal housings without ventilating or other openings and shall operate at not over 600 volts, nominal".
We prefer not to install these transformers in vaults, due to space limitations. I've tried to source these transformers but can't find a supplier that has them specifically rated for a Class II, Div 2 location. There are many out there rated for Class I, Div 2 locations, but that is for combustible gases/vapors, not combustible dust.
I'm sure others have run into this issue. Can someone advise of their approach?
Thanks