OVERCURRENT PROTECTION
Wiring a transformer circuit is one of the most difficult
of wiring tasks, unless the installer understands
transformer fundamentals. This unit deals with dry-type
transformers operating at 600 V and less. Rules for sizing over current protection for this type of transformer are
covered in NEC Section 450-J(b). It must be noted that
these rules apply only to the transformer itself, and not
necessarily to the input and output circuit wires. Sizing
and protecting transformer input and output wires is covered
in the next section.