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Participant

Join Date: Dec 2008
Posts: 1

Leakage Voltages and Distribution Systems

12/16/2008 9:23 PM

I have a problem of leakage voltage in 230 volt ac distribution system for building module . I have observed a 65 volt volts on cable gland of distribution JBs but not on the main JB . The main JB material is cast iron but distribution JB material is fiber .Also main JB grounded but dist JBs are not grounded .Bistribution JBs used for power out lets etc

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Guru

Join Date: Jul 2008
Location: SoCal USA
Posts: 556
Good Answers: 23
#1

Re: regarding leakage voltage in distribution network

12/16/2008 11:44 PM

Mukesh, we could use a bit more detail.

The 65 volts; measured between the gland and where?

Distribution JBs can be ungrounded (by code in some places), but are they bonded? Is there a grounding cable with the conductor run that is used to bond non-electrical metallic parts back to the ground at the main JB?

What material is the gland? Is this in a wet environment?

Think of the many details we might not think of, but that you might know about installation now that I gave you a head start.

This kind of information detail that will help this forum examine your question.

That aside, I would request that you validate the measurement with an electronic tester, and a resistive coil tester (commonly called 'Wiggy' here), and then while the electronic tester is across the test point, add the wiggy across the same test point in parallel with the electronic tester. Report to us if there is a difference (change) in the electronic voltage value.

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Anonymous Poster
#2

Re: Leakage Voltages and Distribution Systems

12/18/2008 5:41 AM

Dear Friend

If the connecting cable is armoured by metal strip or wires then isolate supply and remove glan form both end

Take insulation magger test in between conductor-insulation - armour

You can also check by lamp test from one of the end

You must found the leakage

If it is not then cross check the gland installation

May be metal gland not properly installed for that this leakages observed

May this help you to find out leakage

After identfying the fault; for healthy and safe installation earthing to be done at both ends of the gland

Regards

Pushpak

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Power-User
Hobbies - HAM Radio - New Member

Join Date: Oct 2008
Location: Houston, Texas
Posts: 252
Good Answers: 5
#3

Re: Leakage Voltages and Distribution Systems

12/18/2008 2:42 PM

CJMcGill has you going the right way. Find out how much leakage current is present. His "Wiggie" test will tell you. If the leakage current is not excessive, i.e., little or no voltage indicated on the solenoid voltage tester (Wiggie) referenced to protective earth. Then there is little danger of electrocution.

IMO, it is usually best and often required by code to run a bonding wire through all non-conductive electrical boxes tying all of the conduit hubs and glands together and to return them to earth ground.

Merry Christmas!
TT3

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