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Friday, December 15, 2017
Question:
Good day Charlie,
According to NEC 2017, Why is more restrictive 450-53(A)(1) Less Flammable Liquid-Insulated Transformer Indoor Installations, than 450-26 Oil-Insulated Transformers Installed Indoors?
J.J. Hernandez
A
Answer:
Hey J.J thanks for your question, I think you meant 450.23(A)(1) instead of 450-53(A)(1). The less flammable liquid filled transformer rules are actually less restrictive. Oil Insulated transformers indoors must be installed in a vault as covered in Part III of Article 450 as stated in 450.26.