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#174787 - 02/13/08 09:31 PM Can I run MC to emergency lgts & exit signs?  
Trick440  Offline
Member
Joined: Aug 2005
Posts: 248
Waterford, MI, USA
I recieved some violations:

1. Provide suitable outlet boxes for all installed emergency lighting and exit sign equipment identifying it as suitable for connection to a metallic wiring method, or provide access to this equipemtn to verify internal bonding means. MEC 314.3


....what I did was ran MC, from a j-box went over a foot, then through a concrete block into the back of an all plastic emergency light., no internal bonding avalible. This is Michigan so MC cannot be used for grounding/bonding.

wait, wait ok I guess could open my code book every once in awhile.. I would need non metallic. How should I do this... put a j-box in the opposite side of the cement block and run... erm.. something non metallic... romex? that doesn't sound right... its an old apartment building they turned into condos.

Last edited by Trick440; 02/13/08 09:39 PM.

Shake n Bake

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#174788 - 02/13/08 09:44 PM Re: Can I run MC to emergency lgts & exit signs? [Re: Trick440]  
drum  Offline
Member
Joined: Sep 2007
Posts: 14
USA
Maybe run ENT?


#174805 - 02/14/08 08:22 AM Re: Can I run MC to emergency lgts & exit signs? [Re: drum]  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,863
Brick, NJ USA
Trick:
Are you saying you ran MC into the KO at the back of the exit unit? I assume you connected the EGC in the MC to the grd connection within the exit unit, right?

Then based on what you said above.....open the exit unit so the AHJ can see the EGC connection within the device.

Or...does MEC 314.3 require a 'box' at each device (luminaire) location?


John

#174809 - 02/14/08 09:30 AM Re: Can I run MC to emergency lgts & exit signs? [Re: HotLine1]  
leland  Offline
Member
Joined: Aug 2007
Posts: 853
Lowell area, Ma. USA
This appears pretty typical. Assumeing there is a connector.

"MEC" this tells me it's a local thing, open the book.

Edit: Heres a link to your amendments.
http://www.michigan.gov/documents/cis/dleg_bcc_2005_electrical_code_part8_207447_7.pdf

Last edited by leland; 02/14/08 09:36 AM.

#174810 - 02/14/08 09:36 AM Re: Can I run MC to emergency lgts & exit signs? [Re: HotLine1]  
Trick440  Offline
Member
Joined: Aug 2005
Posts: 248
Waterford, MI, USA
Yup thats what I did but, Theres no EGC in the exit light.
It came to me last night I should run seal tight.

I am curious on the reasoning for not being able to run MC to the plastic exit sign. The MC is bonded to the j-box its being fed from.... So anyone know the reasoning for this rule. Its certainly in the code book.

MEC 314.3 is the same as NEC 314.3


Shake n Bake

#174811 - 02/14/08 09:41 AM Re: Can I run MC to emergency lgts & exit signs? [Re: Trick440]  
leland  Offline
Member
Joined: Aug 2007
Posts: 853
Lowell area, Ma. USA
I should run seal tight--

ALL plastic, typicaly there is a metal core.

Or mount a metal box behind the fixture.

I too would like to get an inspectors take on this.


#174815 - 02/14/08 11:09 AM Re: Can I run MC to emergency lgts & exit signs? [Re: leland]  
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 826
Michigan
This is saying in other words you cannot run a metal raceway to a Plastic or nonconductive box>>>>?????


#174820 - 02/14/08 12:48 PM Re: Can I run MC to emergency lgts & exit signs? [Re: Yoopersup]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,113
Estero,Fl,usa
I think you should be able to bond the MC at the feed end and be OK but if they want it at both ends why not use a metal fitting with a bonding locknut/bushing attached to the internal EGC?


Greg Fretwell

#174821 - 02/14/08 03:20 PM Re: Can I run MC to emergency lgts & exit signs? [Re: gfretwell]  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,863
Brick, NJ USA
I have NEVER seen a plastic exit unit without a ground conductor included within the factory wiring to the circuit board.

Leland: Nice link, Thanks

Last edited by HotLine1; 02/14/08 03:20 PM.

John

#174823 - 02/14/08 04:45 PM Re: Can I run MC to emergency lgts & exit signs? [Re: HotLine1]  
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
I would like to add that the MEC does allow MC cable with it's grounding means — but if there is nothing at the load end to ground DUH??? If the EM light is nonmetallic then there is no issue. Now if there is a j-box on the fixture it's worth looking at for the option of a feed thru if needed.


George Little

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