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Old 08-15-2016, 10:23 AM   #1
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One neutral for multiple hits?


More of a just curious question but I've seen conduit with one neutral and 3 or 4 different hots for different circuits. When pulling wire in conduit do you only have to have one neutral for multiple circuits? Or should each circuit have its own neutral pulled back to the panel? Don't deal with conduit much but Iight add some circuits to my garage and was thinking about using conduit surface mounted so just setting I got to thinking about last night. Say I wanted to add 3 or 4 outlets each on their own breaker. Can I just run 4 hots and one neutral or do I need a separate neutral for each circuit like romex has?
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Old 08-15-2016, 10:38 AM   #2
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Re: One neutral for multiple hits?


You need a separate neutral for each circuit. You could run 2 MWBCs. From a 2 pole breaker run 2 hots, 1 neutral for each circuit
That will give you 4 dedicated receptacles. You only need 1 ground or use the metal conduit as ground. The receptacles must be GFCI protected.
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Old 08-15-2016, 02:16 PM   #3
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Re: One neutral for multiple hits?


Keep in mind that most new circuits in a dwelling now require AFCI protection, so running MWBCs (shared neutral circuits) is not the best idea. Two-pole AFCI breakers are not widely available yet, and not for all panels.
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Old 08-15-2016, 03:17 PM   #4
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Re: One neutral for multiple hits?


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Originally Posted by Speedy Petey View Post
Keep in mind that most new circuits in a dwelling now require AFCI protection, so running MWBCs (shared neutral circuits) is not the best idea. Two-pole AFCI breakers are not widely available yet, and not for all panels.
Petey, the poster says the 4 new circuits are for the garage.The 2014 NEC does not require AFCI for garages (YET). Also He is in Wisconsin which apparently is on 2011
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Old 08-15-2016, 06:03 PM   #5
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Re: One neutral for multiple hits?


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Petey, the poster says the 4 new circuits are for the garage.The 2014 NEC does not require AFCI for garages (YET). Also He is in Wisconsin which apparently is on 2011
Ah! Missed that, thanks.
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Old 08-15-2016, 07:35 PM   #6
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Re: One neutral for multiple hits?


You should not have seen 4 hot wires and one neutral.

But in a commercial or industrial building it is common to have 3 phase feeds and branch circuits and these have 3 hots and one (sometimes no) neutral.
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Last edited by AllanJ; 08-15-2016 at 07:45 PM.
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Old 08-16-2016, 04:47 PM   #7
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Re: One neutral for multiple hits?


Correction: We can have numerous hot conductors all sharing the same neutral in a conduit where some of those hot conductors are controlled by upstream switches
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Old 08-18-2016, 10:55 PM   #8
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Re: One neutral for multiple hits?


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Correction: We can have numerous hot conductors all sharing the same neutral in a conduit where some of those hot conductors are controlled by upstream switches
They do all have to be on the same breaker. You can't pair hots from one circuit with neutrals from another. If you do that, you risk overloading the neutral. It's not clear to me if the OP has that situation or not.
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