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Fox's Mercantile

On 12/10/18 4:04 AM, wrote:
On Sunday, 9 December 2018 19:14:44 UTC, Ron D. wrote:
tabby says...

All domestic mains current loads are balanced, ie live & neutral carry the same & opposite current, resulting in nearly zero magnetic field. Pacemakers, like any life-critical medical equipment, are designed & tested to meet harsh real-world conditions & keep going.

Nope:

The neutral carries the "difference current" in the legs of a split phase system. It can be 180 or -180 out of phase (Said for ease of understanding). It can also be zero, but not likely,

The "difference current" is more accurate. While voltage is usually sinusoidal, current doesn't have to be. Voltage is what's regulated. inductive loads are one matter, but laptop switching power supplies is another.

I think you'll find house sockets are wired single phase.

NT

Actually, the term "Split Phase" is accurate.
The source is a center tapped 240 volt winding.
-180 0 +180 degrees.
Either side to center (neutral) is 120v, and across both sides (hot)
is 240v.
The usual problem is when people insist on calling it 2-phase due to
the +/- nature of it.
It is not, the primary is single phase.

The real problem occurs in a 3-phase Wye system.
A-N, B-N and C-N are each 120 volts. Until someone who doesn't know
how it works, takes A-B and tells the consumer it's 240v. And then
typically table saws go up in flames, because they REALLY do no like
running at 208 volts with a 120 instead of 180 phase shift across
the windings.

--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com