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#46869 - 01/04/05 06:01 PM Building Disconnect
shortcircuit Offline

Registered: 06/27/04
Posts: 608
Loc: massachusetts
Today at the supply house I asked for a Nema 3R 240 volt 60 amp single phase non-fusible disconnect switch suitible for service equipment.Well they came out with a 3-pole safety switch.

I want to use this for a Building Disconnecting Means on the exterior of the accessory building before entering to the panel.My overcurrent protection is where the feeder originates.

Maybe it is more common to use a Nema 3R circuit breaker enclosure with a circuit breaker as the disconnect instead of a non-fusible switch.

What have you used or seen in the field. Any part #'s would be helpful.


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#46870 - 01/04/05 07:04 PM Re: Building Disconnect
resqcapt19 Offline

Registered: 11/10/00
Posts: 2209
Loc: IL
I don't think that you will find many non-fusible disconnects that are listed as service equipment.

#46871 - 01/05/05 06:31 AM Re: Building Disconnect
JBD Offline

Registered: 07/12/01
Posts: 599
Loc: WI, USA
Most of Square D's non-fusible 240V and 480V disconnects/safety switches are UL Listed as service entrance.

Square D does not make a knive blade design 2 pole non-fusible switch except as NEMA 3R 240V 30 & 60A sizes. So, it is likely that your supply house only stocks 3 pole devices.

#46872 - 01/05/05 11:06 AM Re: Building Disconnect
velect Offline

Registered: 05/01/04
Posts: 79
Loc: st joseph mi usa
A breaker disconnect would be a lot less expensive. Almost half the price

#46873 - 01/05/05 05:07 PM Re: Building Disconnect
Wirenuttt Offline

Registered: 11/10/02
Posts: 267
Loc: Massachusetts
We sell the enclosed circuit breaker 3R for service disconnects. It is a lot less expensive. Smallest we sell is the 100 amp rated size. Just place a 60 amp 2-pole cb in it.

#46874 - 01/06/05 05:59 AM Re: Building Disconnect
Steve Miller Offline

Registered: 08/30/01
Posts: 322
Loc: Loudoun Cty, VA
If there is a breaker at the source of the feeder and it's coming from another panel, it's a sub panel not service eqpt. Use any 3R disconnect.

#46875 - 01/06/05 06:10 PM Re: Building Disconnect
shortcircuit Offline

Registered: 06/27/04
Posts: 608
Loc: massachusetts
I decided to get a Nema 3R circuit breaker enclosure suitable for service equipment for my accessory building disconnect which has a feeder run underground to it from a seperate building.

A knife style non-fusible disconnect suitable for service equipment was unavailable in the supply house.

I wanted to use a knife style disconnect outside the building because I envisioned that it would be easier for emergency personal to identify it as the building disconnect and it would be just a throw of a handle to shut down the building power.

Steve Miller...225.31 requires a disconnect and 225.36 says it must be suitable for service equipment.




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