WHAT YOU NEED TO KNOW

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Every residential house has 2 incoming legs of power connected to their electrical panel. This is called a single phase system. The legs of power are called phase A and phase B. Each leg carries 120 volts of power. You need 2 legs of power because there are appliances in your home that require 240 volts to operate. The 2 phases interweave each other in the electrical panel. You must install 2 pole breakers to power these appliances. Another type of electrical system is the three phase system.

Three phase systems are found in commercial buildings. When installing electrical circuits in your breaker box you want to balance phase A and phase B evenly. This will produce a more efficient electrical system. Performing a load calculation will help you balance your electrical loads.