Building or structure disconnecting means

[hhsting]

I have Multibuilding Campus Style Complexes that comply with NEC 2017 Article 695.3(C). I have a customer-owned transformer that feeds the fire pump to the Fire Pump Building. The customer-owned transformer is located outside, and secondary conductors come into the Fire Pump Building fire pump controller disconnecting means. The customer-owned transformer is located outside, about 40 feet or more from the Fire Pump Building. The Fire pump Building also has another feeder feeding into Panelboard A with a main breaker for lights, receptacles, and unit heaters.

So the fire pump controller disconnecting means I don’t see it as building or structure disconnecting means, because it just disconnects the fire pump. The Panelboard A main breaker is also not a building or structure disconnecting means because it disconnects the light, power, and unit heaters, but not the fire pump.

My question is for the enforcement of NEC 2017 Article 250.32(B)(1) “…An equipment grounding conductor, as described in 250.118, shall be run with the supply conductors and be connected to the building or structure disconnecting means and to the grounding electrode…”. What would be considered as my building or structure disconnecting means in my case?

 

[don_resqcapt19]

The panel at the load end of the feeder conductors.

 

[hhsting]

The panel at the load end of the feeder conductors.

In case you haven’t noticed transformer feeding the fire pump controller is customer owned. The secondary conductors are feeder based on definition of NEC 2017 Article 100. They are i measured it 100 feet from the transformer and come into the building.

So fire pump controller with disconnecting means would not be considered building disconnecting means? So no grounding electrode from fire pump controller to the building grounding electrode?

 

[augie47]

225.30(A) would allow both the "lighting" panel and the fire pump controller to be " building disconnects" and both should be connected to the building grounding electrode system.

 

[don_resqcapt19]

In case you haven’t noticed transformer feeding the fire pump controller is customer owned. The secondary conductors are feeder based on definition of NEC 2017 Article 100. They are i measured it 100 feet from the transformer and come into the building.

So fire pump controller with disconnecting means would not be considered building disconnecting means? So no grounding electrode from fire pump controller to the building grounding electrode?

You have two feeders to the building as permitted by 225.30. Both have building disconnects at the load end, both require EGCs run with the feeders, and both require that the EGCs be connected to the grounding electrode system at the building.