Earthing a Borehole

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CHR15

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Hi!

I have recently installed a borehole pump in a pre-existing borehole on my property. The pump I installed is one of those kits (CRI Pumps- MK1). It works fine and delivers the predicted amount of water.
It came with a pre-spliced cable. The cable is too long, so I thought I'd shorten it. When I cut the submersible cable, I found that it is a 3 core cable. The wires connected are: Run, Start and Common. There is no earth connected. This is how CRI has wired it..
My question is: how do I earth the pump? Do I need to run an additional wire for earth? If so, do I just run an un-insulated copper wire, or does it need to be submersible?

Thanks for the help
Chris
 
Inside the connector box is a screw or a bolt attached to the body of the pump. That is where the earth wire goes

Just under the outside sheath of the submersible cable is the earth, usually all the way around the cable. You can bend back some of these, attach a green PVC cable and use a stainless steel clamp

Don't leave out the earthing
 
chrisc said:
Inside the connector box is a screw or a bolt attached to the body of the pump. That is where the earth wire goes

Just under the outside sheath of the submersible cable is the earth, usually all the way around the cable. You can bend back some of these, attach a green PVC cable and use a stainless steel clamp

Don't leave out the earthing
Click to expand...

Hi, thanks for the reply.
The cable is not screened - it looks just like cabtyre, except it has "submersible" and "made in india" printed on the outside. Only three wires - no screen.
Unless you mean the short section of flat wire before the splice - this might have an earth in it - then they must have just not connected it to anything...
I will earth it.. Will have to pull the pump and connect a bare earth, and cable tie it up the pipe..

Thanks
Chris
 
I have also always put a separate earth down if the cable doesn't have one, can't hurt it.
But is my 1m earth spike better than 30m or more down in a pool of water?
 
The whole pump and motor is submerged in water. Everything is earthed already.
 
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