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Disconnect #52625
05/31/05 06:51 PM
05/31/05 06:51 PM
E
Electric Ian  Offline OP
Member
Joined: Feb 2004
Posts: 133
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.

Work Gear for Electricians and the Trades
Re: Disconnect #52626
05/31/05 07:06 PM
05/31/05 07:06 PM
I
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
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
Re: Disconnect #52627
05/31/05 08:32 PM
05/31/05 08:32 PM
E
Electric Ian  Offline OP
Member
Joined: Feb 2004
Posts: 133
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.

Re: Disconnect #52628
05/31/05 08:35 PM
05/31/05 08:35 PM
C
caselec  Offline
Member
Joined: Apr 2002
Posts: 558
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
Re: Disconnect #52629
05/31/05 08:37 PM
05/31/05 08:37 PM
E
e57  Offline
Member
Joined: May 2003
Posts: 2,876
S.F.,CA USA
Is this for that steam unit?


Mark Heller
"Well - I oughta....." -Jackie Gleason
Re: Disconnect #52630
05/31/05 08:41 PM
05/31/05 08:41 PM
E
Electric Ian  Offline OP
Member
Joined: Feb 2004
Posts: 133
MA, USA
e57, yes, it is.

Re: Disconnect #52631
05/31/05 08:47 PM
05/31/05 08:47 PM
R
Rich R  Offline
Member
Joined: Apr 2005
Posts: 27
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

Re: Disconnect #52632
05/31/05 08:49 PM
05/31/05 08:49 PM
E
Electric Ian  Offline OP
Member
Joined: Feb 2004
Posts: 133
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.

Re: Disconnect #52633
05/31/05 09:01 PM
05/31/05 09:01 PM
E
e57  Offline
Member
Joined: May 2003
Posts: 2,876
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
Re: Disconnect #52634
05/31/05 10:02 PM
05/31/05 10:02 PM
E
Electric Ian  Offline OP
Member
Joined: Feb 2004
Posts: 133
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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