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Old 04-01-2010, 11:56 AM   #46
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This diagram look ok?


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Originally Posted by Rudeboy View Post
As for an easier install I would wire the three ways differently:
Hot to one two gang box (the bx), pigtail it so you have two commons.
Switch legs to other box (commons also).
Two individual 14-3's from box to box which will be your travellers.
Splice all your neutrals and grounds together and you're done.
Not quite sure how this differs from the other two diagrams. In your example, is the light fed from the bx box, or the other box?

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Old 04-01-2010, 11:57 AM   #47
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MC cable has a grounding conductor inside. BX never had a grounding conductor.
mc and bx are the same thing. Trade name for aluminum sheath cable is bx. Common trade pratice is also to always use the white as the feed and the black as the return. I believe this is also code. Reason being that if someone takes apart the fixture they will see the white wire maretted with the black and know that this is not a neutral. The neutral is supposed to be marked...this is just some added insurance.
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Old 04-01-2010, 11:59 AM   #48
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mc and bx are the same thing. Trade name for aluminum sheath cable is bx. Common trade pratice is also to always use the white as the feed and the black as the return. I believe this is also code. Reason being that if someone takes apart the fixture they will see the white wire maretted with the black and know that this is not a neutral. The neutral is supposed to be marked...this is just some added insurance.
MC and BX are NOT the same thing. At least not in the US.
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Old 04-01-2010, 12:11 PM   #49
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MC and BX are NOT the same thing. At least not in the US.
take a peek....u.s wire site...bx does infact have a ground and they refer to mc and bx in the same sentence.
http://images.google.ca/imgres?imgur...fGHYW0lQed2ohe
apparently bx is just a generic name given to all AC cable nowadays.

Last edited by andrew79; 04-01-2010 at 12:14 PM.
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Old 04-01-2010, 12:17 PM   #50
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This diagram look ok?


BX is an old type of modern AC cable. Neither has an internal equipment ground. MC cable has an internal insulated equipment grounding conductor. The sheathinng of MC cable is not an equipment grounding means.The sheathing of AC and previously BX cable is allowed as the grounding means. Just because someone writes and article comparing the two does not mean they are the same. They are even covered by different articles of the NEC.

Last edited by brric; 04-01-2010 at 12:26 PM.
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Old 04-01-2010, 12:33 PM   #51
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can you provide me with that section of code from the nec?....i'd be interested in comparing it with ours.
you can get cable with and insulated ground here or you can get cable with a bare ground. The later is what we call bx.

Last edited by andrew79; 04-01-2010 at 12:36 PM.
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Old 04-01-2010, 12:50 PM   #52
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Articles 320 and 330.
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Old 04-01-2010, 01:08 PM   #53
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i seem to recall back when i was an apprentice someone telling me not to get into an arguement over bx with a person from the states . I'm assuming this is why. I wonder if it has to do with the fact that in canada your not allowed to use the sheath as a ground. Probably why they include the bare conductor inside with the wires here and not there.

Last edited by andrew79; 04-01-2010 at 01:12 PM.
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Old 04-01-2010, 01:12 PM   #54
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This diagram look ok?


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i seem to recall back when i was an apprentice someone telling me not to get into an arguement over bx with a person from the states . I'm assuming this is why.
I just want to get correct information out there.
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Old 04-01-2010, 01:15 PM   #55
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i edited my above post....i'm assuming that using the sheath as a ground is ok in the u.s? can you confirm this for me?
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Old 04-01-2010, 01:23 PM   #56
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i edited my above post....i'm assuming that using the sheath as a ground is ok in the u.s? can you confirm this for me?
AC/BX the sheath is acceptable as a grounding means.

MC cable the sheath is not a grounding means, hence the grounding conductor

To complicate things further, Southwire is making a new MC/Ap (all purpose) which does have a sheath rated for equipment grounding as well as the grounding conductor thus making it acceptable for use with redundant grounding required for health care facilities.

IMO MC cable is superior because of the integral equipment grounding conductor.
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Old 04-01-2010, 01:30 PM   #57
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i've always like our version of "bx" for the same reasons...i like to be looking at my ground. Too many times have i seen a bad installation where someone split the sheath by bending it to tight and just left it installed. Having the grounding conductor is a big plus as it leaves alot less room for error.
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Old 04-01-2010, 03:19 PM   #58
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Not quite sure how this differs from the other two diagrams. In your example, is the light fed from the bx box, or the other box?
It's basically the same as your first diagram except for using four switches rather than 2 duplex switches.
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Old 04-03-2010, 10:34 PM   #59
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This diagram look ok?


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Originally Posted by secutanudu View Post
Not quite sure how this differs from the other two diagrams. In your example, is the light fed from the bx box, or the other box?
The other box. Sorry I didn't really look at your diagram.

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