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Discuss Earth fault on water pump in the Electrical Forum area at ElectriciansForums.net

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Alright folks,
First time poster but im at my wits end! Got a mobile welfare unit which has a small 3kw hand wash in it. The water to the hand wash is fed from a small pump which comes on when the sensor for the hand wash is activated. There is a flying earth lead from the pump which is now getting between 60 and 80 volts to neutral and the same to earth. With this lead disconnected everything works as it should but obviously when i connect it it just blows fuse straight away.
Initial thought was obviously a faulty pump so changed the pump but new one is doing exactly the same. Could this be down to bad neutral or something somewhere? Im completely lost. All other cables and circuits appear to be testing out fine unless im missing something stupid.

Should also mention its all fed from an on board generator.
Hope someone can point me in right direction,
Thanks
 
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Pete999

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I would advise you get an Electrician local to you to come and sort the problem for you, advising from a remote Forum, for something like this is ill advised, nothing like someone with eyes on the problem.
 
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Afternoon Pete,
Thanks for the response. I am an electrician, with 12 years experience but have never came across a fault like this before. Was just hoping someone else might have seen something similar. Appreciate your response tho, ill maybe phone a friend ☺
 

Pete999

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Arms
Esteemed
Afternoon Pete,
Thanks for the response. I am an electrician, with 12 years experience but have never came across a fault like this before. Was just hoping someone else might have seen something similar. Appreciate your response tho, ill maybe phone a friend ☺
Ah right sorry
 
Does the flying earth lead actually earth the pump or is it for supplementary purposes.
 
I think you need to isolate the power, connect the flylead and do some insulation resistance tests. You may well have a fault to a piece of floating exposed metalwork and by connecting the flylead you are completing the fault path. That is one possible scenario.
 
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I think you need to isolate the power, connect the flylead and do some insulation resistance tests. You may well have a fault to a piece of floating exposed metalwork and by connecting the flylead you are completing the fault path. That is one possible scenario.
Thats interesting and quite possible. The fly lead wasnt connected to the main cpcs, it was onto a bolt on the metal work. Ive had enough for today but will try that tomorrow and report back.20190717_171534.jpg
 
So the green/yellow wire is the flylead, connected into the pump? When connected to your arrowed earth stud the fuse goes?
 
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  • #9
So the green/yellow wire is the flylead, connected into the pump? When connected to your arrowed earth stud the fuse goes?
Yeah thats correct. And when its not connected to the earth stud and i put my meter across the green/yellow fly lead and my main earth or neutral im getting between 60 and 70 volts
 
By the main earth you mean that stud? What is the metalwork that stud is part of.
 
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  • #11
No sorry the main earth bar at the consumer unit. That is a metal casing which houses the pump and hand wash unit
 
B

Bobster

So the metal frame is connected to the MET at the CU correct?

What are the IR test results?
 
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