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#45570 12/02/04 09:45 AM
Joined: Nov 2004
Posts: 80
B
Bert66 Offline OP
Member
Guys I've done very little commercial or open wall work. My question is I'm wiring a work shop (40 x 40), open beams and purlins. Sould I use BX as my trunk line then enter a junction box then use EMT to drop down to the recepticals and light switches.

Also since I will be useing single stranded wire (black, white, & green) should I run my ground (green) conductor all the way back to the service panel or is it acceptable to bond the ground in the metal boxes useing the EMT as a path for the ground as long as I use a bonding ring that the panel.

#45571 12/02/04 11:39 AM
Joined: May 2001
Posts: 376
F
Member
I run bx to emt all the time is the bx going to be hidden in a ceiling?I would run a ground in the emt because both compression and screw type connectors are crap.Then again i usually skin the bx to length and use a BX to EMT connector to transition to the pipe without a box and you have bare ground right there at the devise.

#45572 12/02/04 04:38 PM
Joined: Jan 2003
Posts: 4,391
I
Moderator
Frank what kind of 'BX' has a bare 'ground'?


Bob Badger
Construction & Maintenance Electrician
Massachusetts
#45573 12/02/04 06:36 PM
Joined: Aug 2002
Posts: 1,691
S
Member
Frank

I really hope you're NOT mistaking the aluminium bonding wire (that's supposed to be bent over the red devil and wrapped around the jacket) to be the same as the bare ground wire in NM cable!!! [Linked Image]

#45574 12/02/04 06:58 PM
Joined: Dec 2000
Posts: 4,287
Member
Bert,
You should be fine doing the job as you stated, as long as it's all installed properly, and there aren't any local ordinances prohibiting it.
Either Type MC or AC cable will work well.
EMT is approved for grounding by the NEC, and bonding jumpers should be installed to the devices from the boxes that they are in.

Frank, I'm curious
Why do you think all EMT connectors are crap?
What is a BX to EMT Connector?

#45575 12/02/04 09:11 PM
Joined: Feb 2003
Posts: 231
R
Member
These emt-bx connectors come in handy. BX or AC90 does have a bare bond wire inside. http://www.foxelectricsupply.com/co...asp?qsCatID= 24991&qsProductNo=8610

[This message has been edited by RobbieD (edited 12-02-2004).]

[This message has been edited by RobbieD (edited 12-02-2004).]

#45576 12/02/04 09:25 PM
Joined: Jan 2003
Posts: 4,391
I
Moderator
The bare strip in AC is not a grounding conductor.

You can wrap it back or cut it off flush with the armor.

Quote
320.100 Construction.
Type AC cable shall have an armor of flexible metal tape and shall have an internal bonding strip of copper or aluminum in intimate contact with the armor for its entire length.


Bob Badger
Construction & Maintenance Electrician
Massachusetts
#45577 12/02/04 09:38 PM
Joined: Feb 2003
Posts: 687
A
Member
Was there a problem with these 1/2 pipe to 3/8 flex connectors having the UL listing removed? If so why? I know a number of inspectors that won't accept these. I could not find them in a Regal catolog.

Here is the Arlington Industries page: http://www.aifittings.com/b_9.htm#860

Next to all the 1/2-3/8 ones it says * CSA only.

Tom

[This message has been edited by Active 1 (edited 12-02-2004).]

#45578 12/02/04 11:52 PM
Joined: May 2001
Posts: 376
F
Member
OK guy's maybe were talking about different cable.I thought he was referring to AC90.When we order bx 12/2 from the wholesalers around here we actually get AC90.I have to specify BX skin and diameter if I just want the aluminum cladding.The only time we use bx skin is for fire alarm or communication circuits and it never has the bonding strap in fact i thought they didn't make it like that anymore.Same goes for the connector.EMT is almost always run with a ground around here because a lot of the time the connectors come loose and compromise the ground from vibration improper installation or rough usage.While inspection will pass some EMT installations without a ground wire they generally let you know they don't like it.I would run AC90 to EMT with a connector or go all pipe before i bothered with pulling wire in bx skin.Sorry for the slang terminology but bx and AC90 is the same here my mistake.
RobbieD,
Thats the connector i was talking about.

Iwire,I have never seen the bonding strip come in AC90 just the bare ground wire.

[This message has been edited by frank (edited 12-02-2004).]

#45579 12/03/04 12:01 AM
Joined: May 2001
Posts: 376
F
Member
RobbieD
I think i now see the misunderstanding.We are in Canada different rules i guess.Ho well just trying to help.



[This message has been edited by frank (edited 12-02-2004).]

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