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Thread: Tap rule

  1. #1

    Tap rule

    Bill or whoever! I'm working on an R&D project to where I would think would save between 38% and 48% labor on installation cost. I'm in the Airport Baggage Industry and have come up with a new channel installation instead of the typical Hoffman installation which is cumbersome, labor intensive, etc. My question to you is if I have let's say 40 2.5 motors on one conveyor which an e-stop at different locations would stop the complete line anyway, why couldn't I use the Tap rule (I don't have my code book in front of me) and what size feeder should I run from the MCP?

  2. #2
    Quote Originally Posted by tetay56@yahoo.com View Post
    Bill or whoever! I'm working on an R&D project to where I would think would save between 38% and 48% labor on installation cost. I'm in the Airport Baggage Industry and have come up with a new channel installation instead of the typical Hoffman installation which is cumbersome, labor intensive, etc. My question to you is if I have let's say 40 2.5 motors on one conveyor which an e-stop at different locations would stop the complete line anyway, why couldn't I use the Tap rule (I don't have my code book in front of me) and what size feeder should I run from the MCP?
    If you protect them from overload seperately right after your main feeder tap, you can do what you are proposing. I've done one VFD, supplying one bus panel, starting 32 fan motors.

  3. #3
    Join Date
    Feb 2003
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    Wisconsin
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    It sounds like you might need to consider 430.53(C) and (D) for group motor applications as well.
    Just because you can, doesn't mean you should.

  4. #4

    Tap Rule

    What component would you recommend I install after each Tap?

  5. #5
    Join Date
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    Location
    Tennessee
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    Quote Originally Posted by tetay56@yahoo.com View Post
    What component would you recommend I install after each Tap?
    Do we get a cut of the cost savings if we do the engineering for you ?
    The component(s)at the tap would have to satisfy the tap rules of 240.21 plus provide proper motor OL per 430 Part III and motor SCGF protection per 430 Part IV.
    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.

  6. #6
    No! I don't need you to engineer it for me , I was just asking for suggestions!
    I've been in the trade for 36 years and hold 3 Master's licenses. I'm limited to 2-1/2" deep X 6" wide of work space in this channel system, so that is what I'm requesting. I may have to add a larger junction box between the tap and motor. Any suggestions?
    Thanks
    Last edited by tetay56@yahoo.com; 04-01-10 at 04:18 PM. Reason: forgot dimension

  7. #7
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    Far be it for lowly me to suggest to a master, but perhaps:

    http://raise.rockwellautomation.com/...AA401C16421B2C
    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
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    Quote Originally Posted by tetay56@yahoo.com View Post
    No! I don't need you to engineer it for me , I was just asking for suggestions!
    I've been in the trade for 36 years and hold 3 Master's licenses. I'm limited to 2-1/2" deep X 6" wide of work space in this channel system, so that is what I'm requesting. I may have to add a larger junction box between the tap and motor. Any suggestions?
    Thanks
    Not if you're so rudely going to cut us out of any profits.

    Roger
    Moderator

  9. #9
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    I think Gus's link may have timed out so let me suggest this one

    Roger
    Moderator

  10. #10
    Join Date
    Jul 2005
    Location
    Tennessee
    Posts
    12,798
    thanks Roger. I didn't know AB links timed out like that.
    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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