For an industrial machine, yes. See NFPA79:2007:5.3.2 as a reference. Don't forget the additional requirements for LOTO and the like. So a qualified yes.
If you're looking to create an outside disconnect for the power in a building .... this is exactly what shunt trips are made to do. Just be sure to instal the switch 'upside down.'
A shunt trip at the panel does not meet NEC requirements for a disconnect at the machine.
Could be if your trying to match the function of a knife switch, the feeder to a DP needs to disconnect (open) the feeder circuit, in other words the shunt breaker would be the one supplying the feeder to the DP not in the DP itself - just like a knife switch.Would a shunt trip breaker on an main distribution panel be an alternative to a main (knife switch)?
Utility service disconnecting means - 230.70 ?Means shall be provided to disconnect all conductors in a building or other structure from the service-entrance conductors.?My question is in regards to a 208v service main disconnect on the exterior
I'm looking at a job that has a bushbutton next to the CT can. The POCO requires a means on the exterior. I've only seen a shunt installed on kitchen equipment and some hospital gear, never on the main
It may satisfy code but the firemen etc that may need to use it probably won't have a clue.
Utility service disconnecting means - 230.70 ?Means shall be provided to disconnect all conductors in a building or other structure from the service-entrance conductors.?
We're allowed to use a pushbutton and shunt trip main around here also. Although it doesnt kill "All " of the power in the building, it does disconnect the conductors from the service-entrance conductors.
Which requirement?
430.102
The push button shunt system I believe falls under 230.70(A)(3). There are exceptions to 230.2 but the rule is building supplied by only one service. I believe the intent is to kill all power to the building or structure, usually for emergency personel, this can be done by one move of the hand or six. A building with more than one servcie can also be miss-wired in that circuits could mix from differant services - brainless but it's happened. :roll:Utility service disconnecting means - 230.70 ?Means shall be provided to disconnect all conductors in a building or other structure from the service-entrance conductors.?
We're allowed to use a pushbutton and shunt trip main around here also. Although it doesnt kill "All " of the power in the building, it does disconnect the conductors from the service-entrance conductors.
My question is in regards to a 208v service main disconnect on the exterior
I'm looking at a job that has a bushbutton next to the CT can. The POCO requires a means on the exterior. I've only seen a shunt installed on kitchen equipment and some hospital gear, never on the main
It may satisfy code but the firemen etc that may need to use it probably won't have a clue.
Well said ? it helps to remember the service disconnects purpose is to physically open the utilities serving conductors not just shut off power. With underground Service Lateral it delineates the Service Point (utility) from Premises Wiring (non-utility).I believe 230.70(A)(3) is saying that if you use a remote control device (shunt trip) to activate the service disconnect, the service disconnect is still required to be located in accordance with 230.70(A)(1). The shunt trip does not take the place of the properly located service disconnect.
The NEC does not necessarily require the disconnect to be located on the outside. If you have a disconnect on the inside, that complies with 230.70(A)(1) then the NEC is satisfied. If the POCO requires something more, then they will need to decide whether the shunt trip will satisfy them.