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Thread: Busduct / Bus plugs

  1. #1
    Join Date
    Apr 2008
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    347

    Busduct / Bus plugs

    Looking for some help. We recently purchase a factory next to ours and power distribution method in the building we purchased is busduct / bus plugs. I've done a bit of research and it appears that bus plugs are still code compliant. I really want to gut the system and replace it with MCC's. Looking for some valid reason why bus plugs are unsafe, un-reliable or any other arguments to justify the cost of replacement. As always your replies are greatly appreciated.

  2. #2
    Join Date
    Jul 2005
    Location
    Tennessee
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    15,326
    In my opinion, I certainly would not gut the buss duct system. Many of the industrial customers I had when contracting would have given their eye-tooth to have inherited one. It seems to me the buss duct system and an MCC serve slightly different functions and I would lean toward having both, each as needed.
    At my age, I'm accustomed to restaurants asking me to pay in advance, but now my bank has started sending me their calendar one month at a time.

  3. #3
    Join Date
    Mar 2005
    Location
    Hampton, VA
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    338
    We are using them in lab environments to allow quick reconfiguration of the lab power as power needs change. Our safety policy does not allow us to remove or insert bus duct modules while the bus duct is energized, even though the bus duct instructions permit this to be done. Oyr policy requires bus duct to be de-energized before it is reconfigured. To facilitate this, each section of bus duct is supplied by a disconnect to power down the bus during reconfigurations. This has worked very well for us.


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  4. #4
    Join Date
    Jul 2008
    Location
    North Of Tampa Fl
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    394
    We have I-Line bus ducts thru out our plant . Corporate America seems to like moving equipment around in their quest to constantly " make things better " . If this sounds like your company I would leave the bus in place . I feel these are just as safe as a MCC ...

  5. #5
    Join Date
    Mar 2013
    Location
    Rutland, VT, USA
    Posts
    241
    Many of the the factories I have been in use bus ducts as they are an efficient way to reconfigure a factory floor when new machines arrive or an industrial engineer has a better idea for work flow.

    Also MCC's serve a different purpose. Since they are Motor Control Centers the buckets usually have starters/contactors, indicating lights, Manual/Off/Auto switches etc.

    It is almost like comparing apples and oranges.

  6. #6
    Join Date
    Apr 2008
    Posts
    347
    So far I only have reason to keep it.. not what I was looking for..lol.

    You folks that have busduct / bus plugs... what type of maintenance?

    The system I'm looking at is probably 40 years old, is there much that can go wrong with the bus duct, do insulator and splices fail? The age of the equipment is one factor in my desire to replace the system. I may be way off base. Appreciate the replies.

  7. #7
    Join Date
    Jul 2005
    Location
    Tennessee
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    15,326
    Quote Originally Posted by cornbread View Post
    So far I only have reason to keep it.. not what I was looking for..lol.

    You folks that have busduct / bus plugs... what type of maintenance?

    The system I'm looking at is probably 40 years old, is there much that can go wrong with the bus duct, do insulator and splices fail? The age of the equipment is one factor in my desire to replace the system. I may be way off base. Appreciate the replies.
    my opinion
    At my age, I'm accustomed to restaurants asking me to pay in advance, but now my bank has started sending me their calendar one month at a time.

  8. #8
    Join Date
    Mar 2013
    Location
    Rutland, VT, USA
    Posts
    241
    Quote Originally Posted by cornbread View Post
    So far I only have reason to keep it.. not what I was looking for..lol.

    You folks that have busduct / bus plugs... what type of maintenance?

    The system I'm looking at is probably 40 years old, is there much that can go wrong with the bus duct, do insulator and splices fail? The age of the equipment is one factor in my desire to replace the system. I may be way off base. Appreciate the replies.
    One thing you may want to look at is the availability of spares. That may affect your decision.

    As far as maintenance, here is a doc that may help
    Attached Images Attached Images

  9. #9
    Join Date
    Apr 2008
    Posts
    347
    OK I'm convinced we keep the Bus duct & bus plugs.
    My next concern is they are talking about installing a drop ceiling... don't think we can cover the access to the bus plugs? Can anyone point to a NEC section that would address this?

  10. #10
    Join Date
    Jul 2005
    Location
    Tennessee
    Posts
    15,326
    368.10(B)
    At my age, I'm accustomed to restaurants asking me to pay in advance, but now my bank has started sending me their calendar one month at a time.

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