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Thread: Class 1 Div 2

  1. #11
    Join Date
    Aug 2010
    Posts
    13

    still not clear....duh....

    yes I've read those sections....they seem to indicate how cables would enter xp enclosures, lighting fixtures, etc. In this case, its already been indicated that I needed a sealoff at each entry into the controller.....the cable itself will have its conductors sealed, either in the sealoff or just past the seal....so the cable gland is not actually sealing the cable, or sealing an entry into an enclosure, only acting as a strain relief.....so again...I don't find anything in the code that specifically addresses this...so do I need a specific type of cable gland....does it need an woven extension? does it need to be rated C1D2?
    Thanks, Bob


    better to have embraced your stupidity and looked for assistance than to believe you are intelligent and found out you are truly stupid..........

  2. #12
    Join Date
    Apr 2004
    Location
    Mission Viejo, CA
    Posts
    3,864
    I'm out of the office. If I don't answer you well enough now, it may take a while.

    The "key" is making sure there is no stress on terminals. Anything that does that while addressing 501.15(E) and 501.140 should be suitable. [500.8(A)].
    "Bob"
    Robert B. Alexander, P.E.
    "I know that you believe you understand what you think the NEC says, but I am not sure you realize that what you read is not what it means." (Corollary to Charlie's Rule)

  3. #13
    Join Date
    Aug 2010
    Posts
    13

    Seals

    many thanks.....its what I expected......just wasn't sure if there was some line or paragraph hidden away that I hadn't read that would indicate otherwise.......you have been very helpful.......I greatly appreciate you sharing your time, knowledge and experience.

    Thanks, Bob

  4. #14
    Join Date
    Aug 2010
    Posts
    13

    revisit

    looks like I have a couple more questions......these seem to be out of the realm of my electrician....in the Appleton enclosure there are two grounding screws, one for incoming and one for outgoing. The incoming screw was so corroded that it could not be tightened. The lower screw was also corroded but the previous install (we were actually refurbishing three of these units) had a short wire which was wire-nutted to the outgoing motor ground. So we wire-nutted a short wire to the incoming ground, and then added the other end of the extension to the lower wire-nutted connections. I already informed the client this was not satisfactory but I have following questions.

    One, is this even valid. I cannot find any reference in the code indicating its not but I could have easily missed something in the grounding section. (or classified sections)

    Two, would it be legal to drill a hole and tap it in the Appleton enclosure?. Again, no one I know has ever even considered this, and I find no direct mention in the code that might negate this.

    Any help appreciated as always.

    thanks, bob

  5. #15
    Join Date
    Aug 2010
    Posts
    13

    drilling

    already found a prior post of yours indicating it is not acceptable (for the most part) to modify an XP enclosure unless specified by the manufacturer. I probably would not have been prone to this for liability issues in any case.

    Still unclear as to the ground we installed. As I mentioned, I have already indicated to the client this was not acceptable and needed to be addressed properly. I would still like to know if it was a legal method of installing the ground wire.

    Thanks, bob

  6. #16
    Join Date
    Apr 2004
    Location
    Mission Viejo, CA
    Posts
    3,864
    Field drilling/tapping an explosionproof enclosure just isn't a good idea - at least not without close guidance from the manufacturer. I confess I've sent a few enclosures to a qualified shop, but never had the field do it.

    I have no serious problem wire nutting the EGCs together as long as they are properly sized and enclosure is properly bonded to them.
    "Bob"
    Robert B. Alexander, P.E.
    "I know that you believe you understand what you think the NEC says, but I am not sure you realize that what you read is not what it means." (Corollary to Charlie's Rule)

  7. #17
    Join Date
    Jul 2013
    Location
    Houston
    Posts
    99
    Quote Originally Posted by rswolff001 View Post
    have a small wheeled skid....Class 1 Div2......XP enclosure with motor starter, xp motor. Motor is within 2ft of enclosure.....original wiring had a single seal at the enclosure, then xp flexible sealtight, into the motor connection box mounted on the motor (also xp).....question.....do I need a sealoff at both ends of the flexible sealtight? Actual length of the flexible may only be 18" or less.
    Thanks, Bob
    Hello rswolff001,

    I am still learning whats required when have equipment in Class 1 Div 2, I am fairly new to protection method for Class 1 Div 2.

    Can you explain why you need XP enclosure for the motor started and motor? Maybe simple question for others, but I am still learning.

    Thank you

  8. #18
    Join Date
    Aug 2010
    Posts
    13

    XP Enclosure

    thanks.....I also am not comfortable drilling into the enclosure.....I have contacted Appleton and while they seem to indicate its possible, its probably not practical as I would need documentation stating they accept the modification, and I'm guessing that would be difficult at best to obtain.

    As for the grounding, I was concerned because it was an XP enclosure. While I've seen this done in the field, I personally have never wire nutted any of my grounds in an industrial environment. Simply not good practice as far as I'm concerned.

    Thanks again for your answers. I normally am not in the position of wiring xp devices. The electrician I would normally use was not available, but also was not familiar with some of the answers (he had always put sealer on the threaded connections and presumed it was necessary) I have always figured if I wasn't sure ask someone who was.
    ================================================== =========
    In answer to the other posters query I would recommend reading NEC 500 and 502 for starters.

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