Transformer Calculations

Transformer Calculations

An understanding of basic transformer facts and NEC requirements will help you avoid potentially tragic errors.

A transformer transfers electrical energy from one system to another by induction. Except for grounding and bonding connections, there’s no physical connection between the two systems. For this reason, the NEC refers to transformers as “separately derived systems,” as shown in Fig. 1.

The ratio of the number of turns in the primary (supply) side to the number on the secondary (load) side determines how much the unit transforms the power supplied to it. This is

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