Author Topic: How to complete wiring this exterior sump pump?  (Read 459 times)

a_scanner_brightly

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How to complete wiring this exterior sump pump?
« on: January 08, 2018, 11:59:53 AM »
Hi there!

I have a sump pit in an outside walkway, with a sump pump that's connected by extension cord to a nearby GFCI outlet.

Pictured here http://imgur.com/0bGj6wG

Works well, but the power cord sticking out of the pit doesn't look real hot and is probably not up to code.  Someone here mentioned it's a lawn mower risk and I agree.

What's the right way to go about fixing this?

I'm thinking of

1. placing a new GFCI outlet against the house on those red shingles close to the sump pit, maybe a foot or two above grade
2. encasing that GFCI outlet inside of a waterproof metal access box (a NEMA box?)
3. drilling a hole into the bottom of the NEMA box, wide enough to fit 2" wide rigid metal conduit
4. drill a similarly wide hole in the side of the sump pit, a few inches below grade
5. connect the two holes with a 90 degree rigid metal conduit run (goes straight down from the box, then swings 90 degrees to the right into the sump pit below grade)
6. run the power cord from the sump pump in the pit through the rigid metal conduit, and have the plugs terminate inside of the metal access box with the GFCI outlet

Protected from the elements, protected from lawn mower risk, no exposed soft wiring.

Is this all... kosher?
« Last Edit: January 08, 2018, 01:13:20 PM by a_scanner_brightly »

trammatic

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Re: How to complete wiring this exterior sump pump?
« Reply #1 on: January 08, 2018, 06:27:14 PM »
I like the idea of conduit to run the line, but think that you should just avoid the plug altogether.  Hard-wire the sump pump.

BudgetSlasher

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Re: How to complete wiring this exterior sump pump?
« Reply #2 on: January 08, 2018, 06:48:22 PM »
I have a couple comments.

1) What exactly are you thinking when you say a NEMA box? NEMA puts out a set of standards and the number after NEMA matters. What I am concerned about is that you could be installing a GFCI in such a manner that it could be considered inaccessible or concealed; if it is concealed it may not be kosher.

2) Why do you want to use 2" conduit? You probably don't need anything larger than 1/2".

I tend to agree with trammatic, personally I would hardwire the sump pump. Due to the pump's location it probably requires GFCI protection, which in a hardwired application would likely end up being a GFCI breaker.

maricela

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Re: How to complete wiring this exterior sump pump?
« Reply #3 on: January 08, 2018, 07:53:17 PM »
Mine is run in a buried conduit from the sump up under the house because the only electrical was on the back porch. There is a small hole drilled in the porch floor at the outlet and the plug comes up and is plugged in there

a_scanner_brightly

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Re: How to complete wiring this exterior sump pump?
« Reply #4 on: January 09, 2018, 10:23:22 AM »
I like the idea of conduit to run the line, but think that you should just avoid the plug altogether.  Hard-wire the sump pump.

Hmm, I'd like to hard-wire it too, but this pump has two power cords and it's not obvious how to do that.

One power cord runs to the pump's impeller and the other runs to the pump's float switch.  The impeller cord plugs into the float cord at the end of the run.  I'm guessing this is how the float controls the impeller.

Kinda like this: http://s3.supplyhouse.com/images/products/zoom/96847167-4.jpg

« Last Edit: January 09, 2018, 10:25:44 AM by a_scanner_brightly »

a_scanner_brightly

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Re: How to complete wiring this exterior sump pump?
« Reply #5 on: January 09, 2018, 01:05:45 PM »
Here's what the sump pump's current connection to a yellow extension cord looks like

https://imgur.com/ArNTSD5

That needs to change.   I'm a little hesitant about cutting the power cords from the pump open.  Not because I think I can't wire it, but because it doesn't tell a good story if there's ever a problem and it's slightly complicated by the controller action that's going on with the float switch.

So, I put this diagram together.  Basically

1.run romex from the GFCI inside of rigid metal conduit to an access box that's close to the sump pump
2. inside of the access box, put a female 120V socket on the end of the romex run, and
3. connect the unmodified sump pump to the female 120V socket.

https://imgur.com/XMxmck4

I don't really see how to get better than this without completely replacing the sump pump with a version that's meant to be hard wired.