![]() In many cases, a backfed transformer will work fine without any issues but the 2014 NEC ® has new language making it clear that if reverse feeding a transformer, it must be done in accordance with the manufacturers installation instructions.įollowing the installation instructions when backfeeding a transformer may result in selecting the maximum permitted overcurrent device on the primary side to account for the larger inrush current. Often, the electrician will just install a step-down transformer and wire it in reverse in order to turn it into a step-up transformer. ![]() Step-up transformers are not as readily available as step-down transformers. If a specific piece of equipment is installed that requires 480 volts, a transformer can be installed. One of the most common applications is a dry-type transformer installed in a facility where the utility supplied voltage is 120/208 volts. ![]() Transformers are often wired in reverse with the primary conductors terminated to the secondary terminals and the secondary conductors terminated to the primary terminals. Code Change Summary: A new subsection was added to clear up confusion about backfeeding a transformer. ![]()
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