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Thread: Class I Div 2 Motor Termination / VFD cable

  1. #1
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    Class I Div 2 Motor Termination / VFD cable

    I have a motor installation in a Class I, Div 2 area. The motor is 'CSA certified' Class I, Div 2 (according to data sheet) with no sparking devices. By 501.125(B), this should be acceptable. It is fed by Type TC-ER VFD cable that is listed for use in Div 2. Based on 501.15(E)(1), I don't believe I need a seal at the motor termination, since the equipment is not required to be explosion-proof. Am I reading this correctly? So that any standard tray cable gland would be sufficient?

    Also, where this is a shielded VFD cable, I am thinking the jacket is stripped in the peckerhead (after the cable gland), prepped per the cable mfr guidance, and landed in the equipment ground lug at the box. Does this sound correct?

  2. #2
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    It sounds fine.
    "Bob"
    Robert B. Alexander, P.E.
    Answers based on 2014 NEC unless otherwise noted.

  3. #3
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    Quote Originally Posted by nhee2 View Post
    Also, where this is a shielded VFD cable, I am thinking the jacket is stripped in the peckerhead (after the cable gland), prepped per the cable mfr guidance, and landed in the equipment ground lug at the box. Does this sound correct?
    There are several manufacturers who make special glands that bond to the outside of the VFD cable to the shield made especially for this purpose. Much cleaner.

    https://www.anixter.com/content/dam/...tion_Guide.pdf
    Bob

  4. #4
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    Quote Originally Posted by petersonra View Post
    There are several manufacturers who make special glands that bond to the outside of the VFD cable to the shield made especially for this purpose. Much cleaner.

    https://www.anixter.com/content/dam/...tion_Guide.pdf
    Thanks, Bob. Is there a particular mfr/style which you have used/had success with? in VFD application?

  5. #5
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    Quote Originally Posted by nhee2 View Post
    Thanks, Bob. Is there a particular mfr/style which you have used/had success with? in VFD application?
    Never actually installed one myself. Hubbell came to our place for a lunch and learn session and they had some nice looking ones.
    Bob

  6. #6
    Join Date
    Oct 2017
    Location
    CA
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    Quote Originally Posted by nhee2 View Post
    I have a motor installation in a Class I, Div 2 area. The motor is 'CSA certified' Class I, Div 2 (according to data sheet) with no sparking devices. By 501.125(B), this should be acceptable. It is fed by Type TC-ER VFD cable that is listed for use in Div 2. Based on 501.15(E)(1), I don't believe I need a seal at the motor termination, since the equipment is not required to be explosion-proof. Am I reading this correctly? So that any standard tray cable gland would be sufficient?

    Also, where this is a shielded VFD cable, I am thinking the jacket is stripped in the peckerhead (after the cable gland), prepped per the cable mfr guidance, and landed in the equipment ground lug at the box. Does this sound correct?
    I have installed several TMCX connectors with TECK cable in hazardous locations. They work great but maybe overkill for your application. I have never used the VFD cable your talking about so you'll need to do some research to see if they are compatible, or if Crouse-Hinds has something for your cable. But it's a place to start looking.

    http://www.cooperindustries.com/cont...riergland.html

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