This Unit is designed to enable candidates to know and understand the principles of three phase systems. It provides candidates with the opportunity to develop the knowledge and skills to enable them to describe the production and characteristics of a three phase supply. It also provides candidates with the opportunity to develop the necessary knowledge and skills to determine voltages and currents in both balanced and unbalanced three phase loads.

The Unit also allows candidates the opportunity to develop the knowledge and skills to calculate different types of power in three phase loads and also to describe the techniques used to measure active power in three phase systems.
On completion of the Unit the candidate should be able to:

1. Describe the production and characteristics of a three phase supply.
2. Analyse the response of balanced star and delta connected loads supplied by symmetrical three phase supplies.
3. Analyse the response of unbalanced star and delta connected loads supplied by three and four wire symmetrical three phase supplies.
4. Analyse power in three phase loads.