ENT Bushings - Are they required?

Discussion in 'Electrical Forum discussion & Blog' started by seaneys, Aug 11, 2007.

  1. seaneys

    seaneys New Member

    Messages:
    192
    Location:
    Chicago Suburbs
    Hello,

    I'm in an area that requires conduit. I've always used plastic insulating bushings on all threaded fittings (inside of boxes). Over the past few weeks I have noticed that both of my big box stores have stopped carrying them.

    I paniced a little, then decided to dig through the 2005 NEC. I do not see that they are required.

    Are these things really required? Do I really need them?

    Halex P/N 75205B is a sample in case you do not know what I am referring to.

    Thanks,
    Steve
  2. Bob NH

    Bob NH In the Trades

    Messages:
    3,317
    Location:
    New Hampshire
    300.4(F) requires that ungrounded conductors #4 AWG and larger " . . shall be protected by a substantial fitting providing a smoothly rounded insulating surface, unless the conductors are separated from the fitting or raceway by substantial insulating material that is securely fastened in place."
  3. seaneys

    seaneys New Member

    Messages:
    192
    Location:
    Chicago Suburbs
    Ahhh.. Just to make sure I am clear.

    So I am using the typical application of 6 or 7 pieces of 12ga wire in 1/2" ENT the bushings are technically not needed. If I were pulling a 4 ga or larger wire (subpanel, etc), however, I would need to use them.

    Thanks,
    Steve
  4. Bob NH

    Bob NH In the Trades

    Messages:
    3,317
    Location:
    New Hampshire
    That's correct. For example, you can run as many #12 as you can get through a 1/2" metal offset nipple because even the fill requirements don't apply.
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