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Old 07-06-2012, 09:40 PM   #1
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Two different panels/circuits sharing the same conduit


I have a situation where I would like to use the same conduit run to carry wire from a main panel and a sub-panel. The answer to the question why is that in a power outage the sub-panel is generator protected. There is a circuit on the sub-panel which doesn't need generator protection and there is a circuit on the main panel that does. Given the two panels are 70 feet from each other and the two circuits outlets in question overlap by 20 feet - I just want to run each one in the same conduit past each other effectively, but mentally I seem to think this isn't a good idea - i don't think there is a technical issue here, but can't find the code related to this ... thoughts?

Thanks!

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Old 07-06-2012, 10:22 PM   #2
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Two different panels/circuits sharing the same conduit


I'm no electrician, but the first thing that comes to mind is problems with induction.

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Old 07-06-2012, 10:24 PM   #3
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Two different panels/circuits sharing the same conduit


There is no code rule against this.

Some job specifications/building rules wont allow it, however
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Old 07-06-2012, 10:31 PM   #4
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Two different panels/circuits sharing the same conduit


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Originally Posted by wkearney99 View Post
I'm no electrician, but the first thing that comes to mind is problems with induction.
Not an issue if he brings the neutrals also, which is required btw. Second problem, which may not be a problem, is derating because of the added current carrying conductors in the same conduit.
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Old 07-07-2012, 12:00 AM   #5
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Two different panels/circuits sharing the same conduit


Are you asking if you can run a second set of wires thru the pipe that feeds your main panel?

If so, the answer is no you can't.

230.7 Other Conductors in Raceway or Cable. Conductors
other than service conductors shall not be installed in
the same service raceway or service cable.
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Old 07-07-2012, 02:26 AM   #6
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Two different panels/circuits sharing the same conduit


It sounds like this is a feed between the main panel and a sub panel. A set of wires feed power from the main panel to the sub panel, the sub panel also has generator backup power provided to it, one circuit in the sub panel does not need backup power but another circuit in the main panel does. The op wants to know if he can feed power between the sub panel and the main panel to provide backup power to one circuit in the main panel through the same conduit that feeds the sub panel.
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Old 07-07-2012, 06:15 AM   #7
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Two different panels/circuits sharing the same conduit


Quote:
Originally Posted by k_buz View Post
Are you asking if you can run a second set of wires thru the pipe that feeds your main panel?

If so, the answer is no you can't.

230.7 Other Conductors in Raceway or Cable. Conductors
other than service conductors shall not be installed in
the same service raceway or service cable.
Sounds to me like the OP has a raceway between a sub-panel and a main panel... Not likely an issue with what he described he wants to do.
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Old 07-07-2012, 07:25 AM   #8
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Two different panels/circuits sharing the same conduit


The issue is going to be how an interlock or transfer switch is connected.
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Old 07-07-2012, 07:43 AM   #9
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Two different panels/circuits sharing the same conduit


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Originally Posted by Jim Port View Post
The issue is going to be how an interlock or transfer switch is connected.
I don't see the issue, he is just extending loads from one location to another, no different than if he physically removed the wire from panel 'a' and brought it into panel 'b' and vice versa.
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Old 07-08-2012, 02:59 PM   #10
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Two different panels/circuits sharing the same conduit


Thanks for all the input guys! It isn't in the main raceway from panel a to panel b, merely some 1/2 inch emt off the panel. Don't think any derating is required given only 6 ccc are in the emt (2 hot/neutral pairs and a hot/switch pair - so you don't have to have a neutral for every hot in this section of emt). Thanks again all is good!

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