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Old 06-22-2011, 06:19 PM   #1
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NB Cable inside conduit - ok for outdoor use?


I am thinking no way - but figured I should ask the experts. I have some new #8 NB cable I want to run to a irrigation pump for 70 feet. This conduit will be under an existing wood deck (i.e.outdoors) but above grade. To complete the 140 foot run to the pump, I would add a junction box and convert the wire to #8 THWN and a #10 THWN ground wire as the remaining run of wire will be underground. Would this fly with the inspector?

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Old 06-22-2011, 06:21 PM   #2
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NB Cable inside conduit - ok for outdoor use?


If you mean NM cable the answer is no. Not allowed in wet locations, even in pipe.

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Old 06-22-2011, 06:30 PM   #3
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NB Cable inside conduit - ok for outdoor use?


The inside of conduit in a wet location is considered a wet location. Rightfully so, because it always seems to get (and stay) even wetter and grosser than the surroundings!
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Old 06-22-2011, 06:44 PM   #4
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Yes NM-B - Thanks that was my thoughts as well...
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Old 06-22-2011, 06:44 PM   #5
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Yes I did mean NM-B - Thanks!
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Old 06-23-2011, 01:51 AM   #6
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NB Cable inside conduit - ok for outdoor use?


First thing first .,, No NM cable are used in outdoor location at all even with conduit { pipe }

Second thing is how big this pump is ? et what voltage you are plan to hook it up as well.

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Old 06-23-2011, 02:21 AM   #7
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the computer got screwy on moi opps.,,
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Old 06-23-2011, 04:17 PM   #8
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The whole NM-B discussion is a lost cause as I expected.
To answer your 2nd point .. 115 volts - 1 hp - draws ~16 amps when running - #8-2 with #10 ground UF wire about 140 feet, circuit breaker set at 30 amps.
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Old 06-23-2011, 09:51 PM   #9
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NB Cable inside conduit - ok for outdoor use?


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The whole NM-B discussion is a lost cause as I expected.
To answer your 2nd point .. 115 volts - 1 hp - draws ~16 amps when running - #8-2 with #10 ground UF wire about 140 feet, circuit breaker set at 30 amps.
Do this pump motour have exteral overload or interal overload protection ? if not then you will have to down size the breaker down to either 20 or 25 amp breaker otherwise if the motor stall it may not trip the 30 amp breaker if have overload protection then you are fine with part due the NEC code can allow up to 250% of FLA rating of the motour.

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Old 06-29-2011, 06:10 PM   #10
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NB Cable inside conduit - ok for outdoor use?


Yes the 1 HP motor has internal thermal protection so no external protection required. As of today, the project is ready for the inspector...
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Old 06-29-2011, 09:29 PM   #11
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NB Cable inside conduit - ok for outdoor use?


JSAustin, No NM-B to wet location. UF-B could be direct buried w/o conduit. In either case be prepared to install a GFCI breaker if local code is NEC.
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Old 06-30-2011, 03:45 PM   #12
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Thanks RBJ for the heads up.
This is a dedicated circuit to the pump (Also approved for outdoor use). There will be no 115 ac outlets installed on this circuit so no contact to humans. Mr. Inspector will let me know if I need a GFI to meet The Code. Either way - I will post his findings after inspection.
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Old 07-01-2011, 12:18 AM   #13
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NB Cable inside conduit - ok for outdoor use?


I don't think so you don't need GFCI however there may a local code requirement that it will need it for irriagtion pump.

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Old 07-02-2011, 02:54 AM   #14
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I don't think so you don't need GFCI however there may a local code requirement that it will need it for irriagtion pump.

Merci,
Marc
Hi Marc, In domestic and bodies of water (Ponds, irrigation) check out [682.23(B)] where like well pumps and pool pumps...are being hit for GFCI installs up to 60 amps.
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Old 07-02-2011, 10:48 PM   #15
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NB Cable inside conduit - ok for outdoor use?


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Hi Marc, In domestic and bodies of water (Ponds, irrigation) check out [682.23(B)] where like well pumps and pool pumps...are being hit for GFCI installs up to 60 amps.
Rbj.,

I will not challange you but the 682.23B is for pool system so the irriration for watering the feilds do not use the GFCI at all unless I stated only if the local code do show up but I know in State of Wisconsin the irragation water pump do not use the GFCI at all unless you are next to the pool pump and for subersable well pump never use the GFCI at all.

If the submersable pump used for fonation water only then Oui GFCI protected.

BTW French codes are pretty simauir to this so there is no Conneries on this matter.


Merci,
Marc

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