Date   : Fri, 18 Sep 2009 22:37:51 +0100
From   : jgh@... (Jonathan Graham Harston)
Subject: Leccy @ Acorn World '09

Pete Turnbull wrote:
> > is 120V, and in most of the inhabited parts of a building the highest
[snip]
> > places.)  So, compared to the European 230V system I guess they enjoy a
> > slightly reduced shock risk.
> 
> Logical, on the face of it, but apparently debatable.  There's research
> to suggest that 120V is about the worst possible voltage.
 
Also, the lower the voltage, the higher the current you need for
the same power. A 3kW heater needs 13A at 230v, easily carried on
1.5mm copper, whereas 3kW needs 25A at 120v, needing 4mm copper.
 
-- 
J.G.Harston - jgh@...                - mdfs.net/User/JGH
Taxation is like dairy farming. You have to extract the maximum
amount of milk with the minimum amount of moo.