[sdiy] should I connect the plug ground to thetransformerground?

[Dave Magnuson]

At 07:11 AM 8/20/01 -0700, James Husted wrote:
>on 8/20/01 1:12 AM, Tony Allgood at oakley at techrepairs.freeserve.co.uk
>wrote:
>
>> Hi all,
>> 
>> In the UK, you are not allowed to cut the earth cable anywhere. The
>> metal chassis, if it designed to be earthed, must be bonded to earth. If
>> you play your stuff live, you are liable to make it safe for all. That
>> means all earth bonding must be lower than 0.2 ohm from plug to all
>> parts of the chassis. Plastic stuff and other double insulated stuff is
>> free from this of course.
>> 
>I can really see this with 220V being the mains there! I've been shocked by
>the US's 117V and it wasn't pleasant, but 220V would be, well, shocking to
>say the least. One must always respect the power we all use.
>-James
>

I got belted by one leg of 480V-3 phase... I was servicing an air
conditioning roof-top unit in the rain.  A nice 1-1/2" or 2" spark jumped
out and hit the metal side panel as I was removing it.  Threw me about 5
feet, and I landed on my back about 2 feet from the roof edge.  My arm was
numb and tingling for hours.

I was only changing air filters and diagnosing a thermostat wiring problem
(24VAC), so I figured there was no reason to shut the power off.  Last time
I used *THAT* theory.  Lucky I'm not dead (from the shock or the potential
fall).  Respect your mains power.

Dave Magnuson


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