On Mon, 17 Dec 2018 11:05:32 -0500, wrote:

On Mon, 17 Dec 2018 04:36:04 -0800 (PST), trader_4
wrote:

On Monday, December 17, 2018 at 1:00:00 AM UTC-5, wrote:
On Sun, 16 Dec 2018 15:33:13 -0600, Dean Hoffman
wrote:

On 12/16/18 3:16 PM, trader_4 wrote:

I'm using 10 gauge wire. Purchased 20 feet 4 x 10 gauge. Hot, hot, neutral
and ground. $1.96 per foot to be installed into 1/2" PVC conduit as the main
part of the run is outdoors. Metal Clad can be used outdoor only if protected.
PVC can be used indoors, outdoors and underground.

I thought I was missing something there. On another thing that got no response,
did you see where he said he bought the wire already and it's 3 conductors?
He said he's doing the WH and a 20A receptacle. I don't see how you can do
that to code. The problem is with 3 conductors, it's an Edison circuit.
So, it has to have a double pole breaker. If he uses a 20A double pole,
then he's not code compliant with the WH, though we agree that it's so close
to being legal, that it wouldn't bother us. If he uses a 25A double pole,
then he's Kosher with the WH, but then he has a single 20A receptacle on a
25A circuit, which isn't allowed either. Hope he can take that wire back
and get 4 conductor, unless I'm missing something. Funny how these simple
things can get complicated.

Four conductors.
Quote: Purchased 20 feet 4 x 10 gauge Hot, hot, neutral and ground.

What is he going to connect the 4th wire to?
This is a 120v water heater.
A hot, a neutral and a ground.

I guess you didn't read his post or the couple where I commented on it.
He said he was installing one 20A receptacle too. That lead to the problems
with breaker sizing an Edison circuit to support both. And now that I think
about it, maybe there is a more fundamental problem? Can you use an Edison
circuit to support both a hard wired load like a water heater and a
receptacle? I've only seen them used for receptacles.

There is nothing wrong with Multiwire circuits feeding one receptacle
and one piece of fixed in place equipment. He can also protect it with
a handle tied pair of breakers and they do not have to be the same
size. As has been stated several times a 20a breaker would work here.
I would not have a serious problem with 12ga wire but he already
bought the 10.
What is he using for a disconnect if this is not cord and plug?
Well, cord and plug would be EXTREMELY out of the ordinary, and a
fused or non-fused disconnect would both be good candidates . Commonly
used for air conditioner comprssor/condensor units.

Something like an EATON DPB222R - designed foe 220 but often used for
120 as well.

Or a Square D Model # L211N - available from Lowes for about $35

Even simpler, a Leviton Model # 3031-2W mounted in a standard wiring
box - less than $20 at Home Despot. Don't know about in the USA but a
plug-in connection for a standard water heater doesn't meet code.

Plugging inthe eductor blower on a gas heater is allowed (it comes
with a 15 amp standard cord and plug)