This article was posted 03/30/2007 and is most likely outdated.

Article 330 Metal-Clad Cable: Type MC - 330.108
 

 

Subject - Article 330 Metal-Clad Cable: Type MC - 330.108

March 30, 2007  

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Metal-Clad Cable: Type MC

330.108 Equipment Grounding (Bonding)

Section rewritten to clarify when Type MC cable is permitted to serve as an equipment grounding (bonding) path.
Where MC cable is used for equipment grounding it must comply with 250.118(10) and 250.122.

Author’s Comment: The armor on interlocked Type MC cable isn’t listed as an equipment grounding (bonding) conductor (effective ground-fault current path), therefore an equipment grounding (bonding) conductor must be installed within the metal armor wrap [250.118(10)]. Figure 330-4


Figure 330-4
(Click on image to enlarge)

       
 
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Comments

  • Can this equipment grounding conductor be bare inside the MC cable or does it have to be insulated? Thanks Joe

    Joe Wells
    Reply to this comment

  • We are trying a "new" type of MC cable called mc-ap. It has a bare #10 aluminum ground wire, which is in intimate contact with the armor. At termination, we simply strip back the armor, bend the ground wire back over and cut it flush with the end of the armor. When used with proper connectors, it is listed as a grounding means. This saves us from spicing the ground wires and pigtailing them to the box. Saves room in the boxes also.

    Joe V
    Reply to this comment

  • I think manufactures have had their hands in this for a long time now. MC,armored cable,bx,basically all the same. When are they going to have just one type of cable with the same rule for all? If they are able to get bx approved for grounding they could get MC as well if they had the will.Mike, any thoughts?

    john villafane
    Reply to this comment

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