Equipment ground cable installation
Equipment ground cable installation
(OP)
We are designing the grounding for roof mounted HVAC units for an industrial building. The roof will consist of precast concrete planks covered by rigid insulation and topped with a membrane. The equipment grounding cable will be bare copper. In the interest of minimizing the number of roof penetrations, we are considering laying the equipment grounding cable on top of the precast concrete planks and below the rigid roof insulation, and connecting to each of the HVAC unit enclosures that would be grouped together, which would form a loop requiring only one penetration down to the next floor. (After this long introduction, my apologies) my question is, should we be concerned about the creation of a fire hazard by having the bare ground wire in contact with the rigid insulation?
Thanks, in advance for any and all responses.
Bxny
Thanks, in advance for any and all responses.
Bxny






RE: Equipment ground cable installation
RE: Equipment ground cable installation
What you are talking about is a supplemental grounding system that cannot replace the equipment grounding conductors. As mentioned, if you elect to install this grounding system, it must be bonded to the building ground system, preferably at multiple locations and also bonded to the equipment grounding conductor at each HVAC unit.
But if you run a proper equipment grounding conductor (green wire) you don't really need anything else per NEC.
As for the fire hazard issue, I don't really know - sorry.
RE: Equipment ground cable installation
RE: Equipment ground cable installation
RE: Equipment ground cable installation
Thanks for all your input.
bxny
RE: Equipment ground cable installation
RE: Equipment ground cable installation
RE: Equipment ground cable installation
RE: Equipment ground cable installation
RE: Equipment ground cable installation
RE: Equipment ground cable installation
RE: Equipment ground cable installation
Why not share your reasons for the extra grounding? The forum works best when information travels both ways. Maybe those confused by your application can learn something.