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#52625 - 05/31/05 04:51 PM Disconnect
Electric Ian Offline
Member

Registered: 02/10/04
Posts: 132
Loc: MA, USA
I need to install a disconnect in very limited space for for a 4.5 KW water heater.
Any recommendations for a small footprint disconnect.

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#52626 - 05/31/05 05:06 PM Re: Disconnect
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
4500 / 240 = 18.75 amps.

How about a 30 amp rated two pole switch, it will fit in a single gang box.
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts

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#52627 - 05/31/05 06:32 PM Re: Disconnect
Electric Ian Offline
Member

Registered: 02/10/04
Posts: 132
Loc: MA, USA
That would work except the switch is going to be mounted under a vanity and I'm afraid a standard toggle switch might be inadvertantly turned off as items are placed under there for storage. For that reason I was leaning towards a pull out disconnect.

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#52628 - 05/31/05 06:35 PM Re: Disconnect
caselec Offline
Member

Registered: 04/14/02
Posts: 557
Loc: San Jose, CA
You could install a WP single receptacle cover on the switch to protect it.

Curt

[This message has been edited by caselec (edited 05-31-2005).]
_________________________
Curt Swartz

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#52629 - 05/31/05 06:37 PM Re: Disconnect
e57 Offline
Member

Registered: 05/27/03
Posts: 2837
Loc: S.F.,CA USA
Is this for that steam unit?
_________________________
Mark Heller
"Well - I oughta....." -Jackie Gleason

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#52630 - 05/31/05 06:41 PM Re: Disconnect
Electric Ian Offline
Member

Registered: 02/10/04
Posts: 132
Loc: MA, USA
e57, yes, it is.

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#52631 - 05/31/05 06:47 PM Re: Disconnect
Rich R Offline
Member

Registered: 04/25/05
Posts: 29
Loc: Florida
The smallest 30 A disconnect I have seen is roughly 6"wide by 6" high and around 3" thick.

Your best bet is the toggle switch with an off the shelf W/P cover like caselec suggested, I don't think you can get any smaller than that. If you want to get fancy try one of these
http://www.newark.com/product-details/text/CD121/4907.html

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#52632 - 05/31/05 06:49 PM Re: Disconnect
Electric Ian Offline
Member

Registered: 02/10/04
Posts: 132
Loc: MA, USA
Or one of these should do the trick: http://www.improvementscatalog.com/Parent.asp?product=158489x&dept%5Fid=0&subdept%5Fid=40

Thanks for your input.

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#52633 - 05/31/05 07:01 PM Re: Disconnect
e57 Offline
Member

Registered: 05/27/03
Posts: 2837
Loc: S.F.,CA USA
Still trying to figure out what part of the code these "steam units" fall under. See the code forum.

424 requires:
Disconnect within site of equipment or controler, and in some cases be able to locked open.

And 427 requires:
"disconnecting means shall be of the indicating type and shall be provided with a positive lockout in the “off” position."

Sounds like either way it may need to able to locked open.... Then again I have always done them with a lockable fusable disconnect switch, when I thought they were under a different code....
_________________________
Mark Heller
"Well - I oughta....." -Jackie Gleason

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#52634 - 05/31/05 08:02 PM Re: Disconnect
Electric Ian Offline
Member

Registered: 02/10/04
Posts: 132
Loc: MA, USA
Hmm, interesting. I was thinking that it just fell under the same category as a water heater, i.e. an appliance (422)

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