"jamesgangnc" wrote in message
...
On May 2, 9:03 am, Tom Horne wrote:
On May 2, 7:45 am, jamesgangnc wrote:





On May 2, 6:37 am, "RBM" wrote:

"The Daring Dufas" wrote in
...

On 5/1/2011 9:12 PM, RBM wrote:
"The Daring wrote in message
...
On 5/1/2011 7:40 PM, wrote:
OK, here'e the questiond du jour. Was helping a friend and when
we
took off the circuit breaker panel cover we discovered that for
both
AC units, whoever did this used white for one of the 240V hots.
There
is no tape or tag to identify it as a hot. Is this allowed by
code?
Even if it is, seems bad practice to me. I would have used either
red
or black.

If you see a 10/2 with ground hooked to a two pole breaker on one
end
and
disconnect for an AC condensing unit, water heater or dryer plug
on the other end, you pretty much know that the white wire is
another
240 volt leg.

I agree with you, although, you should NEVER have a 10/2G feeding
an
electric dryer, unless you can find a piece of 10/2 SEU copper,
which
I've
never seen.
Despite the code, it is extremely rare that I ever see the white
wire
remarked

I've seen it for years but as of late the rule change calls for a
four
wire circuit. Years ago I installed a lot of dryers with 10/2 w/gr
but
now I use 10/3 w/gr or 8/3 w/gr. The smallest aluminum SEU you can
run
in a house around here is #2 which I often use for stoves. Moving an
old
dryer to a new location has us removing the old 3 wire cord and plug
for
the 4 wire cord and plug. I often run 10/2 w/gr to the disconnect
for a
2 ton condensing unit and never bother to mark the white wire
because it's
in the same jacket as the black and ground.

TDD

10/2g is fine for hot water heaters, or A/C units. It has never been
acceptable for an electric dryer, because the ground/neutral was
required to
be insulated. The only exception was using SUE cable, originating from
the
main service panel- Hide quoted text -

- Show quoted text -

Actually 10/2 with a three prong plug was acceptable for dyers for a
long time. Dryers have a metal strap inside them that connected
neutral and ground together. The code now calls for a 4 prong plug
and 10/3 with ground now. But I'll bet there are still millions of 3
prong installations out there. I don't know if replacing the dryer
meet the code requirement to upgrade to 10/3 since you are not
actually touching the circuit any. Existing circuits do not have to
be upgraded to meet newer code releases.

He was talking about moving the dryer not just replacing it.
--
Tom Horne- Hide quoted text -

- Show quoted text -

I didn't see anything in the thread about moving a dryer? The op
mentioned it related to the ac compressors. On pure 240 circuits such
as an ac compressor use of 2 conductors with a ground always has been
and is still accpetable. Same is true for hot water heaters. New
wiring for appliances that use both 240 and 120 such as stoves and
electric dryers now requires 3 conductors plus ground. And a 4 prong
outlet. RBM stated that 2 condutor with a ground was never accpetable
for dryers and that's just false. For many years dryers were wired
using 10/2 and the strap inside the dryer connected neutral and ground
together.

** NO, RBM stated that 10/2g was never acceptable for electric dryers. 10/2
copper SEU cable would be acceptable, but I have never seen it. You would
typically see 8/2 aluminum SEU. 10/2g Romex has NEVER been Nec approved for
electric dryers