A wired doorbell system has three components: a low-voltage (15- to 20-volt) transformer, a chime and a doorbell button. They are connected by 18- or 20-gauge low-voltage wires. Although it’s at low ...

An autotransformer is a transformer having part of its winding included in both the input and output circuit. A simple autotransformer connection is shown in Fig. 1. Note that because there is a ...

In this episode, EC&M's Code Consultant Russ LeBlanc identifies a wiring problem with this Class 1 transformer. He points out a violation of the requirements of Sec. 725.46 of the 2014 NEC. In this ...