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Water heater disconnect #178335 05/28/08 02:12 PM
Joined: Apr 2007
Posts: 8
J
jem Offline OP
New Member
Would a double pole 30 amp, 120-277 volt spec grade switch be a suitable disconnecting means for a 240 volt, 5500 watt storage type water heater.

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Re: Water heater disconnect [Re: jem] #178341 05/28/08 03:50 PM
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Posts: 5,316
renosteinke Offline
Cat Servant
Member
Yes, it would. What it would NOT be suitable for would be for two different legs of a 480 volt system.

Re: Water heater disconnect [Re: renosteinke] #178394 05/29/08 01:22 PM
Joined: Oct 2006
Posts: 745
E
EV607797 Offline
Member
Call me crazy, but the last time I checked, a 2P30 amp switch (spec. grade obviously) costs more than an unfused air conditioner disconnect. Not to mention having to man-handle four or five #10's into a device box.


---Ed---

"But the guy at Home Depot said it would work."
Re: Water heater disconnect [Re: EV607797] #178403 05/29/08 04:29 PM
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Posts: 9,571
G
gfretwell Offline
Member
There aren't many 1g device boxes big enough for 5 #10s and a device (17.5 cu/in) I would use a 4x4 with a ring.


Greg Fretwell
Re: Water heater disconnect [Re: gfretwell] #178408 05/29/08 07:03 PM
Joined: Oct 2006
Posts: 745
E
EV607797 Offline
Member
That's pretty much what I meant, Greg. Even in a big box, that's still a bit of work. I don't like to work any more than I have to.

It appears that many 30/60A disconnects use the same housings with different guts, so a 30 amp pullout disconnect is chock full of room.

I had to wrestle with one of those toggle "motor starter" switches in a DEEP box last week in a block wall. It was still enough to break a sweat to get it put back together.


---Ed---

"But the guy at Home Depot said it would work."
Re: Water heater disconnect [Re: gfretwell] #178410 05/29/08 07:31 PM
Joined: Jul 2007
Posts: 1,335
S
sparkyinak Offline
Member
Originally Posted by gfretwell
There aren't many 1g device boxes big enough for 5 #10s and a device (17.5 cu/in) I would use a 4x4 with a ring.
Most boxes I have use are 22 cubic inches in volume.

Come guys. You don't let some #10 wires hand you your hinnie to you, do ya'? I thought you guys were big bad sparkies. smile


"Live Awesome!" - Kevin Carosa
Re: Water heater disconnect [Re: sparkyinak] #178412 05/29/08 08:02 PM
Joined: May 2007
Posts: 47
B
BryanInBalt Offline
Member
When I rough in a 30A for a dryer I'll use a 2gang box rather than taking the time to wrestle with a 1gang box work. The extra 30cents doesn't seem to be worth the extra work to me.

I would do the same for a water heater (where cord/plug are allowed) or use NO box and a cheap disconnect like EV6something mentioned.

Why make anything harder than it has to be?


Design-Build isn't supposed to mean design *as* you build.

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