I ask an electrician to install several outlets on three breakers. I
found that the electrician uses only five wires in the trunking.
Apparently, there is one grounding, one neutral and three hot wires. The
grounding and neutral wires are shared by three breakers.
How safe is it to do it this way? (Please forget about NEC as this is
not in the US.)
Who knows, but no matter what country he's in that method would be
With three circuits, at least two of them would share the same "hot"
wire with the neutral having to bear (up to) twice the load that it's
rated for. This assumes all wires are of the same gauge and rated for
the same current as the breaker.
On Wednesday, November 19, 2014 12:58:45 PM UTC-5, philo wrote:
The OP didn't say it's a residence or give any indication at all as to wher
it's located. He did say it's not in the USA and IDK about you, but
while I've traveled around the world quite a bit, I can't say that I've
analyzed how the systems work even in the countries that I have visited,
much less all the other countries.
I assumed he was talking about his own house, but who knows.
Also: Even though at least one person here mentioned that three phase
residential power is common in Europe it is still a safe assumption to
say single phase is the most widely used /residential/ distribution
That said: It is probable that if someone from outside the US asked a
question here...they very well may in Europe so my initial assumption
could very well have been wrong.
My only experience with European power distribution was when I was
stationed in Germany in the early 70's. Some of my friends had
turn-tables that were designed for 60hz and Germany was 50hz.
Though they could use a step down transformer to give them 115v, the
turn-table was too slow...so I had them wrap a few turns of electrical
tape around the drive wheel.
Oh, I'm in Myanmar. Here, you have single and three phases co-exist in
residential dwellings, sometimes in the same building. And every house
has a generator is the owner can afford one. Blackout happens several
times a day. Every major piece of appliance is protected with a
safeguard which cuts off the current if voltage is too high or too low,
most of the time too low. The voltage is usually around 180 volt.
Yeah, 'cepting up way early he's insisted there are only two service
leads to the panel so it can't be three phase.
I'd also suspect that 3- and single-phase don't exist side-by-side
routinely even in Myanmar in residential dwellings unless they're
sizable apartment complexes--it isn't logical they'd go to the expense.
It's frustrating that the OP doesn't just follow-up with a picture or
two on one of the hosting sites...it would be interesting to see the
actual setup if nothing else.
Except he said "three" circuits and a total of five wires. 3 hot, 1
neutral, I ground
Putting code aside, from a purely safety stand point
it would be safe only if the wires were double the gauge required...
and that /not/ all three shared the same "hot" side.
I rather doubt that's the case.
Yes, but very unlikely to see 3 phase in a residence.
Only once have I seen it...and it was simply because the people had
purchased a small warehouse with an elevator and converted the building
to a residence.
The three phase circuitry was completely separate from all other wiring
and used exclusively for the elevator.
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