NEC 517.14

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I have essiential and normal circuits in patient chairs in 15 separate rooms of hemodialysis clinic.

Nec 2014 517.14 says to connect equipment ground bar to branch circuits serving same patient vicinity. I have two light fixtures one with 277V on essential and one with 120V on normal. Then I have three receptacles two on essential and one on normal 120V.

My question do I still bond the 277V lights to 120V lights and bond receptales panelboards separste or bond them together per NEC 517.14 even though I have different voltages?


Please note wanted to stress even though different voltages part.



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If I understand your question correctly, There is a required min 10 AWG copper bonding of the equipment ground buss in these areas.


So you run a min of a 10 AWG copper, bonding the equipment grounding busses of the panels serving the same area.


It doesn’t matter that the panels are different voltages
 
If I understand your question correctly, There is a required min 10 AWG copper bonding of the equipment ground buss in these areas.


So you run a min of a 10 AWG copper, bonding the equipment grounding busses of the panels serving the same area.


It doesn’t matter that the panels are different voltages
Also do the panelboards have to be with branch circuit loads? What if they uostream oanelboards feeding oanleboard with branch circuit load in patientvicinity area do the upstream have to be bonded as well?

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Also do the panelboards have to be with branch circuit loads? What if they uostream oanelboards feeding oanleboard with branch circuit load in patientvicinity area do the upstream have to be bonded as well?

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I don't really know what you are trying to say there but, 517.14 is simple, all the panelboards serving a patient care area will have their ground busses tied together with a minimum #10 bonding jumper.

The reason is for equipotential.

Roger
 
I don't really know what you are trying to say there but, 517.14 is simple, all the panelboards serving a patient care area will have there ground busses tied together with a minimum #10 bonding jumper.

The reason is for equipotential.

Roger
I have panel MDP which feeds panel LP1, LP2 via transformer, also feeds LX. LX feeds L2 and L3 panels.

Panel LP1 and LP2 one essiential one normal feeds 15 patient care vicinity areas lights and Panels L2 and L3 one essential and ine normal feeds receptacles 15 rooms.

My question: Do MDP and Panel LX need to be bonded as well or only those branch circuit panels LP1, LP2, L2 and L3 have to be bonded NEC 2014 517.14?

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No, MDP and LX don't need bonding because they don't supply branch circuits in the patient care area.

I'll say its very odd to have that many panels serving such a small room. Maybe even a violation if more than 2 panels serve receptacles at the same patient care location.

IMO, its even stranger to have both 277V and 120V lights in the same area. Especially now when multivolt ballasts and drivers are so common.
 
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