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Old 04-20-2012, 02:44 PM   #1
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Well pump wiring code question


Getting ready to replace my well jet pump with a 240 volt model (currently I use a 120 volt pump. Currently I have a 20 amp, 120 volt circuit that runs from the house to the pump house about 60 feet. I use that circuit for the pump, a light and a receptacle. I want to replace that circuit with a 20 amp MWBC using 12/3 UF cable from the sub panel in my detached barn to the pump house (about 20 feet).

Question: Can I use 1/2" seal-tite to run from the sub panel to a a junction box prior to going underground with the 12/3 UF? The seal-tight run would be about 30". (I have a bunch of seal-tite, connectors and #12 THWN that I bought cheap at a storage unit auction.) The seal-tite would be run in the stud bay and along side the ceiling joist to get from one side of the barn to the other.

Question: Can I use an unfused air conditioning disconnect at the pump house to disconnect the 2 ungrounded conductors of the MWBC.

I can find nothing in the NEC that would bar either of these items, but I am a code novice.

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Old 04-20-2012, 04:32 PM   #2
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Well pump wiring code question


Yes to both questions
The 12/3 uf will be a tight fit in the 1/2" sealtite.

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Old 04-20-2012, 04:37 PM   #3
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Originally Posted by jbfan View Post
Yes to both questions
The 12/3 uf will be a tight fit in the 1/2" sealtite.
Running #12 THWN in the seal-tite; then switching to the UF for the underground portion.

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Old 04-20-2012, 04:42 PM   #4
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Originally Posted by rjniles View Post
Running #12 THWN in the seal-tite; then switching to the UF for the underground portion.

Thanks
Even better!
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Old 04-20-2012, 05:39 PM   #5
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Well pump wiring code question


I agree with JB, it'll be compliant.

Just make sure the 12/3 includes a ground.
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Old 04-20-2012, 06:17 PM   #6
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Well pump wiring code question


Are running 240 for just the pump, and using the old wire to run the 120?
I don't think you can mix the two
They do make a disco with an outlet already installed,maybe you can get your 110 from the outlet?
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Old 04-20-2012, 06:28 PM   #7
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Well pump wiring code question


You are going to need a sub panel in the shed to create the 240 and 120 volt circuits.
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Old 04-20-2012, 06:59 PM   #8
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Well pump wiring code question


Joed suggests a sub panel at the pump house. This would be wise for future uses, but much more complicated. The code requires a sub panel is fed by a minimum of 30 amps (10 wire copper), separates the neutral and ground busses, has a grounding electrode (ground rod, well pump case or other) and more. If you stick to a MWBC, get a big waterproof j box, like 10" x 10" and all waterproof couplings for the penetrations.
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Old 04-20-2012, 07:10 PM   #9
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Well pump wiring code question


I reread your second question. You can do all your connections and penetrations in the AC disconnect if you don't exceed box fill and don't put multiple wires in one lug.
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Old 04-20-2012, 08:40 PM   #10
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Well pump wiring code question


Quote:
Originally Posted by joed View Post
You are going to need a sub panel in the shed to create the 240 and 120 volt circuits.
The existing 20 amp circuit will be removed. I will use the 20 amp MWBC for both the pump; light and GFCI receptacle. I believe there is an exception in the MWBC code section that allows it. I will come off the disconnect with a single 12/3 and break out the 240 and 120 in a junction box.


Edit-- 210.4(C) Exception #2 and requires a 2 pole common trip breaker
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Last edited by rjniles; 04-21-2012 at 05:15 AM. Reason: Added NEC reference
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Old 04-20-2012, 08:44 PM   #11
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Well pump wiring code question


Provided you use an internal common-trip double pole breaker, this is allowed.
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Old 04-21-2012, 05:39 AM   #12
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Well pump wiring code question


Reading another thread on wiring for an AC unit gave ma an idea:



I will use this for the disconnect and wire off the load side of the GFCI for my lights (eliminates the need for an additional junction box.) I will still need the 2 pole breaker in the originating sub panel
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Old 04-21-2012, 10:54 AM   #13
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Well pump wiring code question


Quote:
Originally Posted by rjniles View Post
Reading another thread on wiring for an AC unit gave ma an idea:



I will use this for the disconnect and wire off the load side of the GFCI for my lights (eliminates the need for an additional junction box.) I will still need the 2 pole breaker in the originating sub panel
That is what I posting about.
See post #6

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