Grounding for IT system

[m sleem]

Please confirm whether the triangle shape for the IT Grounding system is coded

in NEC or not. We usually design that network for the IT systems but we do not know

where is the source?.


Please see the attached.

 

[ceb58]

Please confirm whether the triangle shape for the IT Grounding system is coded

in NEC or not. We usually design that network for the IT systems but we do not know

where is the source?.


Please see the attached.

That looks more like a Motorola's R-56 standard.

 

[augie47]

IMHO, if the diagram you show was solely for the IT system (not the service), it would be supplemental grounding.
250.4(A)(5) requires a fault path that does not depend on the earth.
The triangular grounding is often shown on engineering drawing, but, as far as I know is not addressed by the NEC.

 

[qcroanoke]

That looks more like a Motorola's R-56 standard.

Does R-56 allow clamps on ground rods?
Have not seen that in R-56 but I try real hard not to.......

 

[ceb58]

Does R-56 allow clamps on ground rods?
Have not seen that in R-56 but I try real hard not to.......

Know what you mean. R-56 dose allow a non-reversible high compression clamp.