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H. Bruce 09-22-2010 07:49 PM

Voltage Problem
 
This evening I decided to install a new light fixture in my backporch and found a voltage problem as described below.

1. Voltage between hot wire and ground, breaker on and light switch off
1 volt.
2. Voltage between hot wire and neutral, breaker on and light switch off
1 volt
3. Voltage between hot wire and neutral, breaker on and light switch on
120 volts.

Why is there 1 volt remaining on the first two when in fact there shouldn't be any? Any help would greatly be appreciated, thanks

nap 09-22-2010 08:17 PM

are you using a digital multimeter (DMM)? If so, you likely have "phantom voltage". It isn't really phantom but an induced voltage with such a low current capacity it is basically disregarded.

frenchelectrican 09-22-2010 09:25 PM

Nap have the point if you have ditgal Voltmeter they can pick up ghost voltage by induction of other conductors.

If you have a indentscent bulb hooked up you will read zero as you highlight first two parts.

Merci.
Marc

H. Bruce 09-23-2010 08:41 PM

I do not have a digital multimeter, I'm using one with a meter on it. Thanks to both of you for answering. Will I just go a head and install
the new light fixture, but what about that 1 volt? Will it not cause a problem?

frenchelectrican 09-23-2010 08:43 PM

Quote:

Originally Posted by H. Bruce (Post 506344)
I do not have a digital multimeter, I'm using one with a meter on it. Thanks to both of you for answering. Will I just go a head and install
the new light fixture, but what about that 1 volt? Will it not cause a problem?

naw I don't think so as long you hook them up in correct way.

Some of the voltmeter can be supersenstive that why sometime can get false reading.

Merci.
Marc

H. Bruce 09-24-2010 12:14 PM

Thanks "frenchelectrican" and "nap" for the information and help I certainly appreciated it. I always thought for induction to be involved the wire had to be in the form of a coil such as a transformer.

I scrolled down the page and see a similar posting or thread ,"small voltage on circuit with breaker off ", by jasonmechler (24 aug 09).

Thanks to all and good afternoon from Eastern Canada.
Bruce


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