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Re: [Amps] what is a 4 wire 240VAC service?

To: <>, "Amps" <>
Subject: Re: [Amps] what is a 4 wire 240VAC service?
From: "Mark Robinson" <>
Date: Sun, 3 Apr 2011 22:51:41 -0400
List-post: <">>
It is a lot safer. They use isolation transformers and 115V on building 
sites in the UK.

UK code will not allow light switches in a bathroom. It either has to be a 
string pull switch in the bathroom or a wall switch on the wall outside the 
bathroom. There are no 240V power sockets allowed in the bathroom apart from 
transformer isolated razor outlets.

Lots of people in the UK die using 240V electric mowers and cutters outside. 
It isn't 120 0 120 like here. It is 240Vrms relative to the Neutral/Ground 
potential. That is 660V pk to pk relative to ground. You take a shock and it 
really hurts if it doesn't kill you.


----- Original Message ----- 
From: "Roger Parsons" <>
To: "Amps" <>
Sent: Sunday, April 03, 2011 8:27 PM
Subject: Re: [Amps] what is a 4 wire 240VAC service?

> There are a couple of things I don't understand: :-)
> (1) When it became clear, probably close to 100 years ago, that 120V was 
> too low a voltage to efficiently power room (or tubes with handles) 
> heaters and similar equipment, why did North America not follow the rest 
> of the world and move to a 230V system? That is, a 3 wire 230V AC service.
> (2) What bright spark decided that black was a good colour choice for the 
> hot wire?
> Actually, there are many other things I don't understand, but those will 
> do for now.
> 73 Roger
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