Any equipment that the patient interacts with needs to "double or redundant" ground. I.e. emt with a ground or med grade mc or ac cable.mjjg92 said:Running a circuit to an xray machine which is located in the hallway of a dental office ,not in a patient care room. Am I required to use Hospital Grade MC cable ? Its going to a 20 amp 240 V wall receptacle.
Some MC is listed as an EGC [250.118(10)], but not all.why not mc? its the same thing only lighter?:001_huh:
2011 NEC said:250.118 (10) Type MC cable that provides an effective ground-fault current path in accordance with one or more of the
following:a. It contains an insulated or uninsulated equipment grounding conductor in compliance with 250.118(1)
b. The combined metallic sheath and uninsulated equipment grounding/bonding conductor of interlocked metal tape–type MC cable that is listed and identified as an equipment grounding conductor
c. The metallic sheath or the combined metallic sheath and equipment grounding conductors of the smooth or corrugated tube-type MC cable that is listed and identified as an equipment grounding conductor
It is pointing out the difference between AC and MC, so it does answer/relate to the question.:whistling2:thanks, 18 doesnt answer my question about mc
Of course the #12 EGC is "as least as good as ac" with a #16 bonding strip.it has a continuos wire, asually #12 that should make it at least as good a egc as ac?
HCF (health care facility) cable incorporates both the bond strip and a green insulated ground which creates the redundant ground path.A fault in MC cable sheathing will follow the spiral of the sheath. It will not go linearly down the cable. This makes that conductor extremely long and a much higher resistance.
The bonding strip in AC cable bonds each spiral to make the sheathing act as a linear conductor.
If there was a lightning strike and that AC cable took a hit, I wonder if there would be a good chance of that bonding strip (pretty thin aluminum) would have a point it burnt in two? If it did, how would we ever know?The bonding strip in AC cable bonds each spiral to make the sheathing act as a linear conductor.
If the panoramic x-ray is used to x-ray a person it becomes a health care areanec-wise, yes ,code-wise it depends on where you are and what type of building, i.e., a strip mall may not require it