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#178335 - 05/28/08 12:12 PM Water heater disconnect
jem Offline
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Registered: 04/30/07
Posts: 8
Loc: nc
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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#178341 - 05/28/08 01:50 PM Re: Water heater disconnect [Re: jem]
renosteinke Offline
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Registered: 01/22/05
Posts: 5316
Loc: Blue Collar Country
Yes, it would. What it would NOT be suitable for would be for two different legs of a 480 volt system.
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#178394 - 05/29/08 11:22 AM Re: Water heater disconnect [Re: renosteinke]
EV607797 Offline
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Registered: 10/25/06
Posts: 744
Loc: Fredericksburg, VA, USA
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.
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#178403 - 05/29/08 02:29 PM Re: Water heater disconnect [Re: EV607797]
gfretwell Offline


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Registered: 07/20/04
Posts: 9039
Loc: Estero,Fl,usa
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.
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#178408 - 05/29/08 05:03 PM Re: Water heater disconnect [Re: gfretwell]
EV607797 Offline
Member
Registered: 10/25/06
Posts: 744
Loc: Fredericksburg, VA, USA
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."
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#178410 - 05/29/08 05:31 PM Re: Water heater disconnect [Re: gfretwell]
sparkyinak Offline
Member
Registered: 07/08/07
Posts: 1307
Loc: Alaska
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
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#178412 - 05/29/08 06:02 PM Re: Water heater disconnect [Re: sparkyinak]
BryanInBalt Offline
Member
Registered: 05/11/07
Posts: 47
Loc: Baltimore
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?
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