ECN Forum Forums Code Related Discussion NEC & other Code issues Dental Office

John,

So if there is no green dot, then the chair can be plugged into a regular receptacle with out redundant grounding, correct?

That may just mean the chair needs a HFC plug cap along with the 517 compliant circuit.
The real question is if a dentist treatment room is a patient care area. I tend to fall down on the "yes" side. I can't think of a more dangerous fault path than through the mouth.

Harold:

You may have to see the mfg specs for the chair. I have not come upon any that were not HCF/Grn dot male cap.

When I worked on wiring a new combined dentist and dermatologist clinic a few years ago, we used the HFC cable for everything in the patient care/exam rooms, including the chair and overhead exam light unit. We had a full basement below to work with in that situation though.
I also ran some EMT for a large branch circuit to one of the dermatologist’s treatment rooms where they had some kind of UV booth used to treat skin conditions like psoriasis.

If it’s in an above grade slab, I wonder if maybe the EC was planning to use that PVC as a sleeve to pull his HFC through later.