redundant ground mc

[dibloafer]

where in the NEC does it specify what height you are required to use hospital grade (redundant ground) mc cable? My journeyman told me that anything below 7'6" aff in a health care facility where mc is used must be redundant ground, but I am having trouble locating where it gives such a height requirement in 517. or 330.

 

[augie47]

517.13 is probably what you are looking for, but, use caution, above the 7-1/2 ft the wiring method still has to have a sheath that complies as ab equipment ground so "standard" MC is still not acceptable (HCF is)