How to Wire a Three-Phase Transformer for 208V

How to Wire a Three-Phase Transformer for 208V


Wiring a three-phase transformer for 208V can seem daunting, but with some basic electrical knowledge and the right materials, it can be a straightforward DIY project. A three-phase transformer allows you to step down higher voltage from the utility company to 208V that can power motors and other equipment.

Benefits of 208V Three-Phase Power

Step-by-Step Guide

Wiring a three-phase transformer is not complicated, but attention to detail is required. Follow these key steps:

Select an Appropriate Transformer

Install Mounting and Enclosure

Connect Primary Windings

Connect Secondary Windings

Install Grounding and Bonding

Check Voltages and Make Final Connections

Wiring Diagram

Here is a basic wiring diagram showing how to connect a 208V three-phase transformer:

Wiring Diagram


With the right preparation and safety precautions, wiring a transformer for 208V three-phase power is a manageable project for a qualified electrician. Following the steps for proper selection, mounting, grounding, and phasing is key. The result is reliable power supply for running larger motors and equipment that require the benefits of 208V three-phase. Take time to thoroughly plan and install your transformer wiring to avoid issues down the road.