Home Tweakers' Asylum

Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

... the code issue? nt

The primary prob in mixing CBs in a panelboard is with the coordination of all devices; the TCCs (time current curves.)

IMO, what UL is trying to prevent is the opening of a Main before a Branch CB. It can happen; been there, seen it.

This can can have *huge* economic and safety issues in an Industrial or Commercial install. Much less I'd say in a typical residential application. Unless Grandma is on a ventilator in the back bedroom...

Another issue is getting the AIC ratings all bass-ackwards.



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  • ... the code issue? nt - cdb 20:42:44 11/08/06 (0)


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