Dentist office equipment wiring

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ccha9219

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Has anyone done a slab in a dentist office? I have floor boxes in patient care areas feeding dental chairs. According to 517.13 it must be in metal raceway. I can't find any reference to "slabs" So my thought is this...
PVC to the nearest wall within 6'of the patient vicinity, stub up in ridgid, bond bushing to bond metal box...liquidtight to the floor box. Or since the patient vicinity does not go below floor level( 517.2 definitions) can I use pvc under ground to a floor box and if so how could I comply with 517.13 (a)? Also what is ment by "Fixed electrical equipment"? Is this our equipment (ie disconnects, ect..?) or medical equipment any thoughts would be gratly appreceated
thanks
 
Re: Dentist office equipment wiring

The branch circuit needs to be a wiring method that is listed as an EGC. With the definition of branch circuit in mind, you must use a steel raceway (or AC cable) all the way to the panel, not just to a J-Box.

The installations that I have seen use RMC with corrosion tape for this application.
 
Re: Dentist office equipment wiring

Pulling an isolated ground to the first metal j box would not provide the intended redundant grounding ...I know it's not the letter of the code but would that interpretation of the intent of 517.13 be acceptable? Or would I be better off running them all overhead in emt to a jbox within 6feet of the chair...then liquidtight or RMC to the floorbox?
 
Re: Dentist office equipment wiring

I agree with Ryan and your second option.

The truth is, for the application of 517.13, the insulated "wire conductor" is the secondary bonding conductor, the metalic raceway is the primary EGC.

Roger
 
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