I have used shunt trip CB's on elevator pit rooms. The requirements for it are in the Elevator code book, and in 620-51(B), talking about automatically opening it prior to the application of water. It is there to shunt (trip) the breaker in the event of a fire.
on the gas pump issue, could you route the nuetral on one pole of a double pole shunt trip breaker? not sure how you would get it to actuate, but it would open all the conductors.
[This message has been edited by trekkie76 (edited 10-13-2004).]
[This message has been edited by trekkie76 (edited 10-13-2004).]
