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.
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.
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.
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.
