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(LIFE SAFETY WARNING! [disclaimer]

For informational purposes only!

Electricity is dangerous!

You can be injured or killed!

Improper installations can cause fire, injury and death!

Should you be doing this yourself?)

What is the largest size of sub-panel and wire that should be used from a 200 amp service for a basement apartment?

Sorry, it depends ...

Literally, it is a question of which manufacturer's load center the sub-panel is being derived from.

Some manufacturers, Square D [QO line] for example, have a 200 amp breaker, QO2200BB, that can be installed in the panel as a branch breaker. This would theoretically allow you to install a 200 amp sub-panel in the apartment.

You need to calculate the load for the apartment and size your branch breaker accordingly.

Remember that the neutral has to be isolated from the ground buss in the sub-panel.


As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.




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โˆ™ 2009-08-09 07:04:15
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Q: What is the largest size of sub-panel and wire that should be used from a 200A service for a basement apartment?
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