Re: being shocked by Amp casing



"Chungho@xxxxxxxxxxxxxx" wrote:

hi all, perhaps slightly off-topic but you guys have been of great
help to me in the past

When I was installing a new hifi amplifier last night, I realised i
was being lightly shocked each time i touched the amplifier case while
I was lying on the floor trying to re-route some of the speaker cables
behind the cabinet.

The shock is definatly between the Amplifier case and the floor. ( no
frayed wires - new installation)
the amplifier is supplied by a 2 wire AC cord ( no earth )
what is causing this?
is this dangerous?

Can I add my own earth wire ( joined to the case, to the AC socket
Earth Plug) ? will this help?

Sounds like either your receptical is wired incorrectly or your
amp doesn't have a polarized plug and is plugged in reversed or
you have a problem inside your amp (system)....

The tingle you feel is because you aren't fully grounded yourself
as you are lying on the floor.. you are partially insulated.. But,
yes, this dangerous.. If you were to grab something that is
plugged in properly... You will complete the circuit causing a
severe shock... as it is likely that the case of something else
will/may be fully grounded.

This can also cause damage to your system if you connect one
item to a properly wired socket and another item in a socket that is
reversed. At minimum... you'll see sparks.

Inspect your wall sockets. The small blade is HOT and the large
blade is neutral/Ground (For US of course). Use a meter to measure
voltage in the socket. You should only get 120 (+ or - a few volts) ONLY if
the small blade is connected to one of your test leads. Otherwise the
socket is NOT wired correctly. Radio Shack used to sell three light
outlet testers.. (Basically three neon bulbs connected to the outlet blades
delta style...) not sure if they still do.... But try them out if your have
one near you...

Sorry, PURE NONSENSE.

I have seen tiny sparks in low light, interconnecting pieces of IT equipment.
ALL PERFECTLY LEGAL.

Graham

.

Relevant Pages

  • Re: being shocked by Amp casing
    ... When I was installing a new hifi amplifier last night, ... Can I add my own earth wire (joined to the case, to the AC socket ... blade is neutral/Ground. ...
    (sci.electronics.basics)
  • Re: being shocked by Amp casing
    ... When I was installing a new hifi amplifier last night, ... Can I add my own earth wire (joined to the case, to the AC socket ... blade is neutral/Ground. ... He had *reversed* the connections there (white to ...
    (sci.electronics.basics)
  • Re: being shocked by Amp casing
    ... When I was installing a new hifi amplifier last night, ... Can I add my own earth wire (joined to the case, to the AC socket ... blade is neutral/Ground. ... He had *reversed* the connections there (white to ...
    (sci.electronics.basics)
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