[Amps] NEC-think.

[R.Measures]

On Jan 5, 2006, at 10:09 PM, Alex Eban wrote:

> ...yes even then!
> What happens is that the trip switch has both the neutral wire AND the 
> live
> one passing through. What keeps it from tripping is the fact that both 
> the
> neutral and the live wires current are equal, so that the magnetic 
> fields
> created by each one cancel reciprocally.

The Neutral does not have a trip-switch / circuit-breaker, it is 
hard-wired -- unless a helicopter crashes into the breaker-box. ,

>  If a fault develops, the currents
> become unequal and the net result is the appearance of a magnetic 
> field that
> trips the switch. In that case the leakage current has to have a path 
> to
> ground in order for the system to operate. This is called differential
> operation and is based on the existence of the third wire in a 
> principial
> way: it has to exist for the protector to work.
> In my home , even though the neutral and ground wires are physically
> connected with one another and to the water pipe ground, there are 
> still 3
> wires going to each outlet, with only netral and live wires passing 
> through
> the protector.
> Saandy	4Z5KS.
>
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>
>
>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org