Redundant grounding

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ks68jazz

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Using hospital grade AC cable ,what is the proper way to terminate both the insulated EGC and the separate aluminum ground wire in patient care areas? The code is kinda vague other than saying that you need redundant grounds.My boss says to take the aluminum ground back under the cable clamp and wrap around the cable , but that doesn't seem like a proper connection.
 
Re: Redundant grounding

You can do whatever you want to with the bonding strip.

Back wrap it

Cut it off

Land it under a ground screw. :)
 
Re: Redundant grounding

I second the motion

Originally posted by iwire:

My vote is to back wrap using it to hold the redhead in place. :)
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Basically, treat it like the strip in BX.
 
Re: Redundant grounding

Bob, unless "redhead" is a standard construction term for a specialized wiring device, then I'll have to ask you to be more genteel with your comments.
 
Re: Redundant grounding

I'm with Bob. The wire only needs to be in intimate contact with the jacket to perform it's function. You can terminate it any way that you like, or not at all by simply cutting or twisting it off. I usually like to cut it about an inch from the jacket and fold it over the antishort bushing.

[ January 04, 2006, 05:11 AM: Message edited by: infinity ]
 
Re: Redundant grounding

Charlie b, redhead = Anti Short Bushing

320.40

Roger
 
Re: Redundant grounding

Originally posted by charlie b:
Bob, unless "redhead" is a standard construction term for a specialized wiring device, then I'll have to ask you to be more genteel with your comments.
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Mr Beck I am surprised you would think that of me. :eek:

I think I am usually gender neutral in my posts.

Anyway These are the Redheads I am talking about.

Antishort-bushing.gif


Some call them red devils or anti short bushing.

The NEC calls them insulating bushings.

320.40 Boxes and Fittings.
At all points where the armor of AC cable terminates, a fitting shall be provided to protect wires from abrasion, unless the design of the outlet boxes or fittings is such as to afford equivalent protection, and, in addition, an insulating bushing......
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Re: Redundant grounding

JessicaCloseUp2_sml.jpg


You didn't really think this was a "red head", did ya?

(Jessica from "Who Framed Roger Rabbit")
 
Re: Redundant grounding

Originally posted by ks68jazz:
My boss says to take the aluminum ground back under the cable clamp and wrap around the cable , but that doesn't seem like a proper connection.
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Your boss is using incorrect terminology. It's not a grounding conductor, it's a bonding conductor to connect the spirals of the AC cable together.

I rarely ever use AC cable but when I do I always cut off the bonding strip.
 
Re: Redundant grounding

Originally posted by charlie b:
Bob, unless "redhead" is a standard construction term for a specialized wiring device, then I'll have to ask you to be more genteel with your comments.
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You're joking, right? :roll:
 
Re: Redundant grounding

Peter, read Bob's sentence again, after rubbing the real definition of "redhead" from your vocabulary.

I had to pick myself up off the floor to write this! :)
 
Re: Redundant grounding

Roger and Bob: Thanks for the education. I really did not know that there was an electrical construction component by the name "redhead." Bob, I apologize for mistaking your intentions.

George: Who says engineers don't have our share of colorful words and phrases? In fact, the earliest one I learned 40 years ago (from an uncle who did electronics work for the Air Force) had to do with color. It was a mnemonic for the color code for resistor values. I still remember the sequence of colors: Black, Brown, Red, Orange, Yellow, Green, Blue, Violet, Gray, White. I'll not repeat the mnemonic. It was both disrespectful to members of a specific ethnic group and an unkind reflection on the feminine half of humanity. More PC versions have been invented since.

There was also a mnemonic I learned in the Navy, for remembering the relationship between the gyroscopic and magnetic compass readings. The acronym was "TVMDCAW." It stood for, "True, Variation, Magnetic North, Deviation, Compass, (Add West)." The related mnemonic, like the one described above, would no longer be considered PC. If you were converting in the opposite sense, from magnetic to true, you added easterly deviation, and the acronym was "CDMVTEA." This mnemonic I can give you: "Can Dead Men Vote Twice At Elections."

So us enjuinears also have terms that are in need of being forgotten.
 
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