Re: ground loops

On 2026-07-11 02:43, Tim wrote:
> On Fri, 2026-07-10 at 14:29 -0400, Frank Bures wrote:
>> I vaguely remember that in the UK they would sell you an appliance with no
>> power plug on it, just a power cable with three wires protruding.  You were
>> supposed to get the plug yourself and have it attached.  I never understood
>> the logic behind this.  Is it still on?
> 
> I don't think it is any more.  The reason behind that, long ago, was
> there was more than one type of power plug in use across the country.
> Which sockets your house had depended on where you were.
> 
> As far as I know they use the same plug across the island these days,
> though theatre lighting can be an exception.  That's almost world-wide,
> it stops someone plugging ordinary appliances into the lighting grid.
> 
> Sometimes that's done in households, too.  You might find a wall socket
> with a round earth pin instead of flat one, it's meant for some kind of
> lighting (floor stand, table lamp, etc) that will be controlled by a
> light switch somewhere in the room.  Also, they'll have used thinner
> wiring leading to it that cannot supply the full load of a general
> purpose outlet, that's another reason to make it hard to plug something
> else into the socket.
> 

Thanks, Barry and Tim, for explanation.

Cheers
Frank

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