690.47

[augie47]

('08 Code)
I have a roof top DC system to an inverter with ground-fault protection connecting the 480v interactive system by a breaker in MDP.
Am I correct in reading 690.47 that my equipment grounding conductors will satisfy the grounding and no grounding electrode (other that the existing AC service) is required ??

 

[Smart $]

('08 Code)
I have a roof top DC system to an inverter with ground-fault protection connecting the 480v interactive system by a breaker in MDP.
Am I correct in reading 690.47 that my equipment grounding conductors will satisfy the grounding and no grounding electrode (other that the existing AC service) is required ??

You left out a lot detail... :huh:

But essentially, yes, provided all the conditions of 690.47(C)(1) through (8) are met.

 

[jaggedben]

('08 Code)
I have a roof top DC system to an inverter with ground-fault protection connecting the 480v interactive system by a breaker in MDP.
Am I correct in reading 690.47 that my equipment grounding conductors will satisfy the grounding and no grounding electrode (other that the existing AC service) is required ??

In the '08 code, no.
You've got 690.47(D).

(It doesn't really make any sense, and a lot AHJs won't require it, but it's there.)

 

[Smart $]

Forgot about that one... :slaphead:

 

[augie47]

In the '08 code, no.
You've got 690.47(D).

(It doesn't really make any sense, and a lot AHJs won't require it, but it's there.)

a. If the roof-top array is fastened to the structural steel meeting 250.52 that would suffice ?
b. Does the '11 Code ease the requirement ?

 

[jaggedben]

a. If the roof-top array is fastened to the structural steel meeting 250.52 that would suffice ?

Hmmm. I don't see why not.

b. Does the '11 Code ease the requirement ?

Yes, by completely eliminating it. (It's back in 2014 though.)