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Old 11-02-2019, 12:41 PM   #1
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Recommendation for exterior run


Hey folks,

I am running 210ft of 12/2 from a well pump to the main panel. What would be your preferred method?

1) Direct bury 12/2 wire ($117 at homedepot), save $100 on conduit

2) Use 12/2 wire ($117 at homedepot) run in $100 worth of 1" conduit

Play it safe with conduit and pull all that wire??

What do you think?
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Old 11-02-2019, 03:39 PM   #2
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Re: Recommendation for exterior run


Either way you must dig a ditch. PVC conduit, 3 #10 conductors, two phase conductors and a grounding conductor.
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Old 11-02-2019, 04:37 PM   #3
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Re: Recommendation for exterior run


Thank you for the reply. Yep ditch is already dug.

The pump is a 3 wire 220v setup, but you recommend going to #10? I ask because the manual for the pump states that at 12AWG my max run can be 430ft @ 9% voltage drop. Shouldn't I be plenty good there? I am only going 210ft.

Thanks!
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Old 11-02-2019, 05:29 PM   #4
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Re: Recommendation for exterior run


Run individual THWN conductors sized depending on the pump rating. Run 4 wires. Red, Black, White and Green. The white will be capped off in the well house until such time you decide to install a light or heater or other 120 volt appliance. It also helps to add a receptacle to the well house for general use. Pulling cable is a PITA. You don't have to bury conduit as deep as you will UF cable, either. How deep is your ditch?
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Old 11-05-2019, 02:14 PM   #5
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Re: Recommendation for exterior run


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Originally Posted by chandler48 View Post
Run individual THWN conductors sized depending on the pump rating. Run 4 wires. Red, Black, White and Green. The white will be capped off in the well house until such time you decide to install a light or heater or other 120 volt appliance. It also helps to add a receptacle to the well house for general use. Pulling cable is a PITA. You don't have to bury conduit as deep as you will UF cable, either. How deep is your ditch?
So right now the ditch is 18-22" deep but I can go deeper.

The reason I was thinking of use the 12/2 (or 12/3 after your suggestion) is that it is much cheaper than the individual THWN. Plus wouldn't the individual wires cause me to need conduit?

Great call on the extra wire though....will definitely want a light at least.
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Old 11-05-2019, 03:44 PM   #6
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Re: Recommendation for exterior run


Quote:
Originally Posted by Kwdelre View Post
Thank you for the reply. Yep ditch is already dug.

The pump is a 3 wire 220v setup, but you recommend going to #10? I ask because the manual for the pump states that at 12AWG my max run can be 430ft @ 9% voltage drop. Shouldn't I be plenty good there? I am only going 210ft.

Thanks!
I'm not sure if the manual is doing the VD correctly, but when figuring voltage drop, you use the from and the too distance.
If the distance in a straight line is 210', and means to the breaker, not just the ditch, you have the return distance also.
In this case the distance is 420'.

The best case is to use conduit and individual THWN wires, and I would do the #10.
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Old 11-05-2019, 04:44 PM   #7
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Re: Recommendation for exterior run


If you run UF cable the ditch will need to be 24". IMO, conduit and individual THWN wires are more stable and less likely to become compromised
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Old 11-05-2019, 06:56 PM   #8
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Re: Recommendation for exterior run


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Originally Posted by jbfan View Post
I'm not sure if the manual is doing the VD correctly, but when figuring voltage drop, you use the from and the too distance.
If the distance in a straight line is 210', and means to the breaker, not just the ditch, you have the return distance also.
In this case the distance is 420'.

The best case is to use conduit and individual THWN wires, and I would do the #10.
You guys have given me some tough choices now, lol.

If I do the #10 THWN in conduit....can I do #14 ground? And what size conduit? Can I get away with 1" or am I asking for trouble. I have neevr pulled 200 ft before.

Am I good with THHN in conduit?

I like your signature by the way. (fellow parrothead)
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Last edited by Kwdelre; 11-05-2019 at 07:04 PM.
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Old 11-05-2019, 06:59 PM   #9
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Re: Recommendation for exterior run


Always think about the future. Running 1 1/2" conduit may be overkill for the moment, but you may see the need for an upgrade sometime out there, and with the larger conduit in place you can feasibly pull larger wires. I would go with a #12 ground. Generally it is one size smaller than the energized conductors.

Use pull string sucked through the conduit with a vacuum cleaner and a "rat" tied to the end of the string, then pull all the wires you need. Just don't do as my helper did. We were sending 250' of string from a 500' spool. He was not paying attention and wound up with 40' of string in the vacuum cleaner. He didn't hear the "thud".
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Last edited by chandler48; 11-05-2019 at 07:02 PM.
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Old 11-05-2019, 07:02 PM   #10
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Re: Recommendation for exterior run


Full sized grounds required for #10, 12, 14

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Old 11-05-2019, 07:05 PM   #11
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Re: Recommendation for exterior run


Quote:
Originally Posted by chandler48 View Post
If you run UF cable the ditch will need to be 24". IMO, conduit and individual THWN wires are more stable and less likely to become compromised
Thank you sir, looks like this is the way to go.
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Old 11-05-2019, 09:33 PM   #12
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Re: Recommendation for exterior run


All I can find around me is THHN...will this suffice?
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Old 11-06-2019, 05:00 AM   #13
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Re: Recommendation for exterior run


THHN and THWN are basically the same, sold often as THHN. THHN is Thermal High Heat Resistant Nylon. THWN adds the water resistant nomenclature.
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Old 11-06-2019, 06:02 AM   #14
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Re: Recommendation for exterior run


Quote:
Originally Posted by Kwdelre View Post
All I can find around me is THHN...will this suffice?

Check at your local Home Depot or Lowers or the like in your area. The spool packaging usually only states THHN. Look closely at the printing on the insulation of the wire. You will see it is dual rated at THHN/THWN. Why they don't print it on the packaging I don't know.
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