Outdoor Transformer used Indoors
Outdoor Transformer used Indoors
(OP)
Is it permissible to use an outdoor liquid-filled transformer, inside a building?
Assuming that it meets local fire regulations....would the transformer be subject to temperature issues...
thanks,
Assuming that it meets local fire regulations....would the transformer be subject to temperature issues...
thanks,






RE: Outdoor Transformer used Indoors
Before PCB oil was prohibited, Askarel (Interteen) filled transformers indoors was considered state-of-the-art for indoor transformers. I believe the original EPA building in Washington DC had indoor oil transformers with Askarel.
RE: Outdoor Transformer used Indoors
RE: Outdoor Transformer used Indoors
RE: Outdoor Transformer used Indoors
If a vault is required, see NEC 450.41 - 450.48. Note that drywall is not an acceptable method of achieving the vault fire rating. Vaults are required to be constructed of concrete with a 3-hour fire resistance.
Also -- Factory Mutual generally has much stricter requirements than NEC for transformer installations. Are you required to comply with FM?
Temperature can definitely be an issue. An exhaust fan should definitely be considered bare minimum requirement. As a ballpark number, the heat load in kW will be about 2% of the transformer nameplate capacity.