OK guy's I am working 4 A.M to noon -thirty and am too tired to look this one up, however it should be an easy one for you guy's.
Question: spider boxes feeding office furniture with several circuits and several whips (3/4 inch flex 8-12 feet long)must each whip contain a green grounding conductor?
I feel (IMHO) that one would suffice the code intention of bonding with conductor rather then a whip. The number of whips is immaterial, because we have established a fault path, which is the intention of the code.
I realize i am sticking my head out there with my "Humble Opinion" but, like I said I am tired.
Thanks Tesla, yes I understand about the decent ground. My question is more about the redundant grounds, you see each whip (3 qty) from my jbox to the spider box has a EGC in the flex with the branch circuits, wouldn't 1 qty EGC suffice the code for bonding the spider box? Or does the code require all 3 whips to have a grounding (earthing , I believe is the new language)conductor?
You need a ground in any FMC whip over 6 feet 250.18 and if "flexibility is required" you need a ground no matter how long it is 348.60 but this installation is more troubling when you look at 348.30 and supporting/securing that FMC. I have a little thing about this because of the number of times I have pulled a floor tile under a computer room floor and seen the FMC about 3" from the connector and looking at the THHN. Joe T may even have some of those pictures that I took. They ran in IAEI magazine at least twice. I would not run FMC anywhere that it will really be moved around much without clamping it beyond the box connector.