A sub-panel is a smaller circuit panel breaker fed from a 240-volt circuit breaker in the main electric service panel. It looks and operates just like the main panel, but it's smaller and contains ...

Here’s what to know about testing your 240V circuit breaker panel. What to Look for in the Breaker Box. Unless your home is very old and has never had its electrical service updated, it has 240 ...

Main circuit breaker switches: These are typically located at the top or side of the electrical box. This switch is the primary electrical safety device that can be used to turn off the power to ...

How Your Circuit Breaker Panel Works. ... Main breaker . This is the on/off switch to the entire breaker panel. A 200-amp breaker is appropriate for a home upwards of 2000 square feet.