CONTROL TRANSFORMERS
Transformers used only for the purpose of supplying
power to control motors and equipment come under the
category of a Class 1 circuit, NEC Section 725-/1. The installation of these transformers is covered by NEC Article
450, as discussed in this unit. Control transformers
are available with a fuse holder on the primary side to
provide transformer protection, as required in NEC Sections
725- JJ, 725- I 2, and 430-72.