Luckily, the house didn't burn.

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210.4b says that each mwbc shall be provided with a means that will simultaneously disc. all ungrounded conductors...so, regardless if it feeds on yoke or more, it needs a 2 pole breaker
 
NolaTigaBait said:
210.4b says that each mwbc shall be provided with a means that will simultaneously disc. all ungrounded conductors...so, regardless if it feeds on yoke or more, it needs a 2 pole breaker
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Or a handle tie. At least in the '08.

But a split-wired duplex may use the same circuit to feed both receptacles.... one hot and the other switched. And it's usually the same circuit doing both. So it's on only one SP breaker then.
 
480sparky said:
Or a handle tie. At least in the '08.

But a split-wired duplex may use the same circuit to feed both receptacles.... one hot and the other switched. And it's usually the same circuit doing both. So it's on only one SP breaker then.
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ok, thats what i thought...so this applies in commercial also?
 
peter d said:
Out of curiosity, why didn't you use a meter/main combo? We rarely use a separate meter can and disconnect like that around here for typical residential services.
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We don't see those around here.
None of the supply houses carry them.
I don't know why, I would love to do them with combos.
Might be a POCO thing.
 
wirebender:

Nice install on the upgrade. :)

I do see some of the neutrals appear to be discolored, were there other overload issues (like both red/black on same leg in the old panel) or was it due to the burning of the #12?

...No power, so I go to check the main panel and find an old six space bulldog panel with 2 single pole 20A and 4 single pole 15A pushbutton breakers, no two poles.
I open this panel and find some #8 aluminum and #12 copper tied into the lugs with the service entrance conductors. ....
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And what was the #8 that was hot-lugged in the old panel feeding?
 
wirebender said:
We don't see those around here.
None of the supply houses carry them.
I don't know why, I would love to do them with combos.
Might be a POCO thing.
Click to expand...

Yeah, more than likely your poco doesn't have a meter main combo on its approved list, which is a shame if they don't because they save lots of time. :cool:
 
mxslick said:
wirebender:

Nice install on the upgrade. :)
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Thank you.:smile:

mxslick said:
I do see some of the neutrals appear to be discolored, were there other overload issues (like both red/black on same leg in the old panel) or was it due to the burning of the #12?
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I don't believe there were other overload issues, I think the discoloration is just from aging. There were no MWBCs in the existing system. I added them to feed the circuits in the old service panel.

mxslick said:
And what was the #8 that was hot-lugged in the old panel feeding?
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The A/C. At least they had a fused disco at the unit there was some protection there.
 
peter d said:
Yeah, more than likely your poco doesn't have a meter main combo on its approved list, which is a shame if they don't because they save lots of time. :cool:
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I have mentioned the combos to my employer and leave it up to him to check whether they are allowed or not.
I can see where they would save time and be easier on me.
Of course, I work by the hour.:smile:
If I were still contracting I believe I would take a closer look at the situation and lobby the POCOs to approve them if they don't.
 
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