X-Ray shunt trip, number of wires?

[Jmrs24]

I have a 100 amp shunt trip 3 phase breaker. It is fed from a 200 amp switch in the main switchgear, that has 100 amp fuses with adapters. The switch was a spare. According to 250.24 (C) do I have to run a neutral to the disconnect even if the X-Ray doesn't require one. If so do you treat the disconnect like a service and have to run a ground to building steel? A service is defined as the conductors and equipment for delivering electric energy from the serving utility to the wiring system of the premises served. Would the serving utility be the main switch gear and the premises served be the X-Ray equipment.

 

[KevinVost]

250.24 is for services. Your x-ray unit is not a service. If your specs for the unit do not call for a grounded conductor, you do not need to run one to the unit.

However, the unit will be located in a patient care area (see definition in art 100) and you need to comply with 517.13 (A) & (B) for recepticles and fixed equipment in patient care areas.

Welcome to the forum!

 

[Jmrs24]

Thanks for the info.

 

[chris kennedy]

Welcome to the Forum.

What does shunt trip have to do with your question? I have never supplied an X-ray from a shunt trip.

 

[LarryFine]

J., welcome to the forum! :smile:

A service is defined as the conductors and equipment for delivering electric energy from the serving utility to the wiring system of the premises served. Would the serving utility be the main switch gear and the premises served be the X-Ray equipment.

The service is the power company's electricity delivery system. The premises is the building being served, not the equipment within.

The service is everything up to the premises' main disconnect. Everything from the switchgear on is the building's wiring system.