On Sun, 4 Feb 2007 17:45:45 +0100 (CET), Peter Chadwick wrote:
>Bob said:
>>Neutral never equals Ground.<
>This is true, but it is hopefully, but not necessarily, at ground
potential, depending on where it is grounded. I measured 24 volts
with a 500mA availability between neutral and ground at the last
place I lived. The voltage varied with load on the housing estate
- the 'ground' was back at the sub-station, and the neutral was
not grounded at each house. The miracles of Protective Multiple
Earthing (PME) as applied in the UK.
Peter,
It is important to realize the difference in neutral bonding in
the UK between in North America. In the UK, the bond between
neutral and ground is done by the power company OUTSIDE the
customer premises. In North America, the bond between neutral and
ground is done INSIDE the customer premises where the power enters
the premises.
In both cases, Bob's advice is spot on.
There is a discussion of these differences in a tutorial "white
paper" I wrote a few years ago.
http://audiosystemsgroup.com/SurgeXPowerGround.pdf
73,
Jim Brown K9YC
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