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Electrical Panel Diagram

Electrical Circuits Page 2

NM cable To loads in building

A phase

power bus

Ground bar

To ground

120 V

B phase

From power

company

transformer

Neutral

120 V

A phase

B phase 120 V circuit breaker

B phase

power bus

Neutral bar

Electrical Panel

Main breaker

Usually mounted in the panel or near the electric power meter

Electric meter

To ground

A phase 120 V circuit breaker

2-pole 240 V breaker (A and B phase)

Basic Electricity

Electrical Voltages

Electrical Ground

Low Voltage

Electrical Definitions

Ohm’s Law

Electrical Circuits

Multi-Wire Branch Circuits

Circuit Current Ratings

NM Cable (Romex®)

Wire Connectors