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Current in Neutral Wire

10/11/2012 11:26 PM

I was trying to replaced the old fluorescent light fittings with new fitting and just wondered neutral wire got some voltage able to give me a shock.

Here is the scenario,

Breaker power supplying to fluorescent light was switched off

Live, Neutral and ground wires from fluorescent light wiring connection was disconnected.

But when i touch neutral wire there is a current but live and ground no current.

Somebody please explain this situation? Is it possible to energize neutral wire even those it not connecting with live?

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#1

Re: Current in nutral wire

10/11/2012 11:31 PM

Yes. One way it can happen is if the neutral to ground (earth) connection is poor or open. In that case, you may get "backfeed" from some other circuit.

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#2

Re: Current in neutral wire

10/12/2012 12:29 AM

There are two or three options.

1. You have a faulty Earth \ Neutral link and getting a back feed.

2. Your Neighbor has this problem and your place is the return path...

3. There is a fault in your house wiring and someone has transposed the Active\Neutral at some point in the wiring in your house.
This means that the Active is on the neutral in one or more areas of the wiring in the house.

Get a Licensed Electrician to look at the problem for you!

Regards,
Sapper

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#3

Re: Current in nutral wire

10/12/2012 3:12 AM

A voltage on the neutral is to be expected. It is an expression of the neutral current and the ground loop impedance.

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#4

Re: Current in Neutral Wire

10/12/2012 11:10 PM

NE to earth connection is open.

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#5

Re: Current in Neutral Wire

10/12/2012 11:10 PM

I've had a similar surprise!

Often times the neutral wire is daisy chained from one light to the next. Even if the live is isolated on the light you're working on - the power was probably on at another light (perhaps another room). If the neutral wires remain connected, then no problem (as long as you do not have any of the errors already mentioned) but if the neutral wire is disconnected from the daisy chain, you'll experience your issue if you touch the neutral coming from the other light...

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