DIY Home Improvement Forum banner
1 - 18 of 18 Posts

·
Registered
Joined
·
8 Posts
Discussion Starter · #1 ·
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?
 

·
Semi-Pro Electro-Geek
Joined
·
3,403 Posts
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!
 

·
" Euro " electrician
Joined
·
5,369 Posts
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.

Merci,
Marc
 

·
" Euro " electrician
Joined
·
5,369 Posts
the computer got screwy on moi opps.,,
 

·
Registered
Joined
·
8 Posts
Discussion Starter · #8 ·
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.
 

·
" Euro " electrician
Joined
·
5,369 Posts
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.

Merci,
Marc
 
  • Like
Reactions: JSAustin

·
Registered
Joined
·
8 Posts
Discussion Starter · #10 ·
Yes the 1 HP motor has internal thermal protection so no external protection required. As of today, the project is ready for the inspector...
 

·
Registered
Joined
·
57 Posts
Gfci?

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.
 

·
Registered
Joined
·
8 Posts
Discussion Starter · #12 ·
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.
 

·
" Euro " electrician
Joined
·
5,369 Posts
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
 

·
Registered
Joined
·
57 Posts
Gfci?

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.
 

·
" Euro " electrician
Joined
·
5,369 Posts
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
 

·
Registered
Joined
·
57 Posts
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
I am with you on agricultural irrigation where open field pumps are exempt. Post 11 is just a heads up based on previous data from a well drilling subscription I received in the last year. (National Driller) I just have not been able to refer to the particular article at the moment.
 

·
Registered
Joined
·
8 Posts
Discussion Starter · #17 ·
I suppose it could go either way. l let you know how the Montgomery County, North Carolina building inspectors interpretthe NEC. July 4th holiday adds another day of delay to the project. Thanks again, I appreciate all the input.
 

·
Registered
Joined
·
8 Posts
Discussion Starter · #18 ·
The Inspector came yesterday and approved the install with a standard breaker. His main concern was the wire type was a UF wire, not NM-B and that the motor had the # 10 equipment ground. As everything else in the circuit was rated at or above a 1 HP motor - it passed the first time. A first for me as well! Thanks to all the advice. Great chat information.
 
1 - 18 of 18 Posts
Top