Re: Old Audio Receiver Hum?

From: harrogate2 (harrogate2_at_ntlworld.com)
Date: 01/05/05 

Date: Wed, 05 Jan 2005 22:18:50 GMT

"Bradley1234" <someone@yahoo.com> wrote in message
news:68YCd.16730$Y57.13606@trnddc08...
> What test tools do you have?? DVM, soldering iron, scope, etc?
>
> Safety training? there are usually unsafe 120vAC points in older
equipment.
> The household power is dangerous because at 60 cycles/second if you
get a
> shock it will try to make your heart go at 60/second instead of
about 60 per
> minute. The individual heart muscles will fibrilate in different
> directions, out of sync, many times unable to recover.
>
> Every house should own a defibrillator device, they are cheap these
days
>

What a load of crap!

The danger from electricity is NOTHING to do with supply frequency -
it is all about current. A current of 30mA - that is 0.03A - passing
through your body across your heart will usually be fatal. 10mA may
cause problems, but in a healthy person will usually not be fatal.

120V (to earth) as used in the US is specifically chosen since it is
rarely high enough to cause 30mA current flow through the body: by the
same token here in the UK and across most of Europe, 110V (actually
55-0-55) is used professionally for power tools etc.

However our normal mains is 220V in Europe, 240V in the UK (that is to
earth) and can be fatal. I understand that in the US 240V is available
across both supply lines but it is actually 120-0-120 and thus much
less dangerous. 

--
Woody
harrogate2 at ntlworld dot com

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