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Home Portable Generator Sub-Panel Installation Copyright-GeneratorPanelOpen-460x613-IMG_6562

Copyright-GeneratorPanelOpen-460×613-IMG_6562

The arrow indicates the change from two single pole circuit breakers to one, two pole, 30 amp circuit breaker to feed the new generator sub-panel.

This Square D generator sub-panel is different in several ways from a regular sub-panel. It comes with two main breakers, one for street power and one for generator power. They are interlocked together to prevent both from being on at the same time. In addition each main breaker has a clamp on it holding it to the busbar as is required by article 408.36(D) in the National Electrical Code

The upper arrow points to the 10/3 Romex cable that is coming from the generator inlet mounted outside which will supply power to the generator sub-panel from the generator when needed. The lower arrow points to the 10/3 Romex cable that is coming from the main panel to feed the Square D generator sub-panel on street power.
The upper arrow points to the cable feed that is coming from the generator inlet mounted on the outside of the house. The other arrow points to the interlock device attached to the generator circuit breaker. The interlock prevents the two main circuit breakers from being on at the same time.