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Old 12-09-2013, 07:56 PM   #1
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Default Hospital Grade M.C cable

Im currently wiring a physician's doctors office. Alot of hospital grade mc cable but with the inspectors blessing got it approved to use all purpose cable on anything above ceiling. Was elated to not have to use the hospital grade mc on all my 24 light fixtures meaning not having to take that ground to the dog houses! What a time saver.
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Old 12-09-2013, 08:00 PM   #2
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What is all purpose cable?
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Old 12-09-2013, 08:04 PM   #3
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The NEC does not require hospital grade MC for the lighting.
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Old 12-09-2013, 08:07 PM   #4
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The NEC does not require hospital grade MC for the lighting.
I think hes using MCAP.
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Old 12-09-2013, 08:16 PM   #5
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Correct, mcap its got the aluminum ground.
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Old 12-09-2013, 08:21 PM   #6
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What is all purpose cable?
Mc cable with a bonding strip in it instead of a copper ground. Like ac cable.
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Old 12-09-2013, 08:39 PM   #7
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BBQ you might want to take a look at 517.11 (patient care vicinity) my interpretation when it says and extending vertically not less than 7 1/2 ft above the floor) I think that your hots and legs coming down to your switches must be hospital grade mc. Your whips in between lights dont have to be. Whats your opinion?
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Old 12-09-2013, 08:45 PM   #8
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That is the way I was taught. If the wire goes below 7.5 feet and the device opens into a patient care area it needs to have a redundant ground.
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Old 12-09-2013, 08:59 PM   #9
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Yes It has an aluminum ground in it that you bend back 120 degrees past the sheath and cut off and when you insert the cable into the connector and tighten that gives you your ground. Just make sure that locknut is tight or you could potentially lose it.
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Old 12-09-2013, 08:59 PM   #10
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BBQ you might want to take a look at 517.11 (patient care vicinity) my interpretation when it says and extending vertically not less than 7 1/2 ft above the floor) I think that your hots and legs coming down to your switches must be hospital grade mc. Your whips in between lights dont have to be. Whats your opinion?

I don't think he was disagreeing with you.

The cable you are calling hospital grade mc, Is actually called Health Care Facilities Cable of HCFC for short.
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Old 12-09-2013, 09:01 PM   #11
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BBQ you might want to take a look at 517.11 (patient care vicinity) my interpretation when it says and extending vertically not less than 7 1/2 ft above the floor) I think that your hots and legs coming down to your switches must be hospital grade mc. Your whips in between lights dont have to be. Whats your opinion?
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That is the way I was taught. If the wire goes below 7.5 feet and the device opens into a patient care area it needs to have a redundant ground.
Regular MC still can not be used for the lights above 7.5 feet in a patient care area but AC can, see the exceptions to 517.13(B), the insulated conductor is not required but a metallic raceway recognized as an EGC is.

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Old 12-09-2013, 09:04 PM   #12
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Yes It has an aluminum ground in it that you bend back 120 degrees past the sheath and cut off and when you insert the cable into the connector and tighten that gives you your ground. Just make sure that locknut is tight or you could potentially lose it.
I didnt think there was approved connectors for AP that had a locknut
I always use the Arlington snap in connectors
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Old 12-10-2013, 11:46 AM   #13
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Regular MC still can not be used for the lights above 7.5 feet in a patient care area but AC can, see the exceptions to 517.13(B), the insulated conductor is not required but a metallic raceway recognized as an EGC is.

Roger
Thanks Roger I have seen some inspectors interpret the 7 1/2ft rule and let regular m/c go.
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Old 12-10-2013, 12:25 PM   #14
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Quote:
Originally Posted by JustinJ View Post
BBQ you might want to take a look at 517.11 (patient care vicinity) my interpretation when it says and extending vertically not less than 7 1/2 ft above the floor) I think that your hots and legs coming down to your switches must be hospital grade mc. Your whips in between lights dont have to be. Whats your opinion?
As roger said, the exception that allows the 7-1\2'(517.13 (B)(1)(3) ex. #2) points back to 517.13(A), which says the metallic raceway, armor, or sheath shall itself qualify as an EGC, which regular MC does not.
Like you I have most definitely seen regular old mc used for lighting in areas considered to be patient care.
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Old 12-10-2013, 05:41 PM   #15
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Thanks Roger I have seen some inspectors interpret the 7 1/2ft rule and let regular m/c go.
Then those inspectors need to go back to school !

I disapprove about 35% of ceiling inspections in patient care areas as the EC does not use the proper wiring methods. It has become such an issue that I printed out copies of 517.13 to give to the electrician when discussing it with them.
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Old 12-10-2013, 06:49 PM   #16
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It has become such an issue that I printed out copies of 517.13 to give to the electrician when discussing it with them.
I know that is not an inspectors job but I say thanks to you and other inspectors that do that.
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