MC Cable Connectors

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josephridolfi6986

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Crystal City, VA - In wiring up a 277 volt light fixture, is it acceptable to use Snap-in MC cable connectors, or do you have to use a Lock Ring type MC cable connector?

What is the code article that supports this?

Thanks!
 
Try 330.40


Edit to add 410.44.

Also see 410.56(F) for further logic.
 
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According to the UL white book, the listed snap-in MC connectors are suitable for grounding circuits over and under 250 volts.

METAL-CLAD CABLE
CONNECTORS, TYPE MC (PJOX)
Grounding ? Metal-clad cable connectors for use with metal-clad interlocking
armor ground cable, corrugated aluminum or copper tube, or
smooth aluminum tube, are considered suitable for grounding for use in
circuits over and under 250 V and where installed in accordance with
ANSI/NFPA 70, ??National Electrical Code.??
Click to expand...

Chris
 
If I remember correctly there was a time when connectors used for over 250 volts required a locknut for bonding.
 
As far as I am aware that is only when there are eccentric or concentric KO'S.Because the heat produced from a 277V short is roughly 5 times that of a 120V short.Which would melt the unremoved KO'S.
A typical 2X4 fluorescent has just the trade size 1/2" KO.The snap in should be fine.
 
Yes. Our snap-ins are rated and listed for that use. They meet the requirements of UL514B, which are the same for a locknut style, strap fitting as they are for a snap-in equivalent. Ours are also easy to remove compared to other snap-in's out there.

Make sure the cable size matches the rating of the fitting.

38ASP.JPG

http://www.bptfittings.com/Catalog/CatalogFamily.aspx?CategoryId=11&FamilyId=445&ShowReturn=true

RockyD - You are right on with 330, 410.44. You can add 250 as well.
 
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