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Posted by JM on April 26, 2006, 11:04 pm
I use a telephone pickup plugged into a Radio Shack amplifier ( cheapo box
around about 2.5"x2.5"x 1" powered with a 9v battery) It works best if the
circuit is loaded with a high wattage appliance such as a space heater.
Turn the volume high, a loud 60Hz buzz is heard over the speaker when the
telephone pickup head is over the wires.
John
show/hide quoted text
> Sasha wrote:
>> Is there relaible device that can track hot 110V wires inside
>> sheetrocked walls? Where can I get it?
> YES, they do make one. It finds/detects ONLY hot wires. It's mainly used
> to check voltage at electrical boxes, outlets, and etc., but it will
> detect through paneling and sheetrock.
> It's called the Greenlee Voltage Detector, Cat. No. 1110 and can be
> purchased at HD/Lowes in the electrical department.
> J
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Posted by Sasha on April 28, 2006, 1:13 pm
I beleive I have the same tester and it only rings when you move close
to electrical box. I tried to scan entire wall with known hot wire
behind itand it didn't give any signal.
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Posted by Stan on April 28, 2006, 4:09 pm
show/hide quoted text
>I beleive I have the same tester and it only rings when you move close
> to electrical box. I tried to scan entire wall with known hot wire
> behind itand it didn't give any signal.
Question: The wires within the wall were alive; but you could not get any
indication; right?
Was the test tried when there was current 'flowing through the wires' to
some appliance/device etc. plugged in further down the circuit?
Reason I ask is because I have once or twice been able to detect certain
wiring location (using something that draws quite a few amps, such as a hair
dryer/heat gun etc. = 12amps. 2 115 volts) not something lightweight (such
as 40 watt lamp bulb = 0.3 amps) using a small powerful hand held magnet and
feeling the vibration caused by the significant amount of AC current flowing
through the wires!
In some cases it seemed that even though the two wires carrying current, hot
and neutral, are very close together and their respective magnetic fields
will thereby tend to cancel, there is enough difference between them to
detect in certain cases.
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Posted by Artemis on April 29, 2006, 9:06 am
Stan wrote:
show/hide quoted text
> Question: The wires within the wall were alive; but you could not get any
> indication; right?
> Was the test tried when there was current 'flowing through the wires' to
> some appliance/device etc. plugged in further down the circuit?
> Reason I ask is because I have once or twice been able to detect certain
> wiring location (using something that draws quite a few amps, such as a hair
> dryer/heat gun etc. = 12amps. 2 115 volts) not something lightweight (such
> as 40 watt lamp bulb = 0.3 amps) using a small powerful hand held magnet and
> feeling the vibration caused by the significant amount of AC current flowing
> through the wires!
> In some cases it seemed that even though the two wires carrying current, hot
> and neutral, are very close together and their respective magnetic fields
> will thereby tend to cancel, there is enough difference between them to
> detect in certain cases.
>
>
You must be wearing your tinfoil hat for this method to be effective.
--
Art
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Posted by Dave H. on April 29, 2006, 11:33 am
"Artemis" wrote...
show/hide quoted text
> Stan wrote:
>> Question: The wires within the wall were alive; but you could not get any
>> indication; right?
>> Was the test tried when there was current 'flowing through the wires' to
>> some appliance/device etc. plugged in further down the circuit?
>> Reason I ask is because I have once or twice been able to detect certain
>> wiring location (using something that draws quite a few amps, such as a
>> hair dryer/heat gun etc. = 12amps. 2 115 volts) not something lightweight
>> (such as 40 watt lamp bulb = 0.3 amps) using a small powerful hand held
>> magnet and feeling the vibration caused by the significant amount of AC
>> current flowing through the wires!
>> In some cases it seemed that even though the two wires carrying current,
>> hot and neutral, are very close together and their respective magnetic
>> fields will thereby tend to cancel, there is enough difference between
>> them to detect in certain cases.
> You must be wearing your tinfoil hat for this method to be effective.
Nope, the hat doesn't matter, as it's a method that will work even through
the tinfoil. The foil would block the electrostatic field from the cabling
(which would be negligible for 220V 2-phase power, anyway), but the
electromagnetic field from the long narrow single-turn solenoid (the two
phases or the phase/neutral pair) will pass through the foil (whether a hat
or plasterboard backing) just fine - with a strong enough magnet, you'd be
able to feel the vibrations alright, a search coil would be even better.
Dave H.
(The engineer formerly known as Homeless)
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>> Is there relaible device that can track hot 110V wires inside
>> sheetrocked walls? Where can I get it?
> YES, they do make one. It finds/detects ONLY hot wires. It's mainly used
> to check voltage at electrical boxes, outlets, and etc., but it will
> detect through paneling and sheetrock.
> It's called the Greenlee Voltage Detector, Cat. No. 1110 and can be
> purchased at HD/Lowes in the electrical department.
> J