Is it safe to feed a subpanel via breaker?

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Old 03-08-07, 10:46 AM
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Is it safe to feed a subpanel via breaker?

I was at my mother's (new to her) 1940s era house mapping out her electrical system. Along with ungrouned 3-hole receptacles, I discovered the subpanel is fed from the main panel by a 60A breaker. The subpanel is a 100A panel, but has no disconnect. Instead, the subpanel is fed through a regular 60A breaker in the bottom-most position. There are 2 20A circuits and 2 15A circuits on this subpanel.

Is this subpanel installation safe?
 
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Old 03-08-07, 10:58 AM
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You haven't told us anything that would make it unsafe.
 
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Old 03-08-07, 11:11 AM
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Thanks for your expertise, racraft.
 
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Old 03-08-07, 01:48 PM
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> I discovered the subpanel is fed from the main panel by a 60A breaker.

This is just fine provided the wire between the main and subpanel is at least #6 copper or #4 aluminum.

> The subpanel is a 100A panel, but has no disconnect.

Subpanels within the same building as the main panel do not require a separate disconnect. Furthermore, panels with 6 or fewer breakers do not require a main disconnect.

> Is this subpanel installation safe?

Seems so.
 
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Old 03-08-07, 03:07 PM
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The subpanel should be fed by a double pole breaker as indicated. There should also be at least one other wire for the neutral bus, hopefully ground bar as well.

But as indicated before, it isn't the amperage of the subpanel box you should worry about, but the feeder wire.for the 60A breaker, you would want at least #6 wire.
 
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