ECN Forum Forums General Topics of the Trade General Discussion Area Different building code books?

It may be fair to say that, for electrical systems, the NEC is sort of the “tip of the iceberg.”

There are thousands of electrical standards for other than premises wiring—like in utility and industrial settings.

Here’s a group of standards for small to very large transformers… http://standards.ieee.org/catalog/olis/dtransformers.html