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A/C Disconnect Wiring Using 12/3 W/Gnd: What to do with the neutral wire?
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A/C Disconnect Wiring Using 12/3 W/Gnd: What to do with the neutral wire?

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A/C Disconnect Wiring Using 12/3 W/Gnd: What to do with the neutral wire?
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Thread: A/C Disconnect Wiring Using 12/3 W/Gnd: What to do with the neutral wire?

  1. #1
    Join Date
    Jun 2015
    Location
    Middletown, CT
    Posts
    7

    Default A/C Disconnect Wiring Using 12/3 W/Gnd: What to do with the neutral wire?

    I am installing an A/C disconnect for a heat pump. I had some 12/3 with ground so that is what I pulled into the box. (15A 2pole breaker but it's a long run to the A/C so 12 AWG seems appropriate) The wiring instructions do not show a neutral wire terminated in the disconnect. I found a couple pictures posted on the internet and one had the neutral terminated on the disconnect ground lug along with the ground wire. The other showed the neutral wire nutted with no connection. I will also be installing surge protection in the disconnect so I was thinking that if the neutral wire is also terminated on the ground lug it will provide a more robust path to ground, should there be a surge. The neutral and ground wires terminate on the same bus in the main panel. What is the correct way to do it?
    Last edited by Greg_E; 06-15-2015 at 07:25 AM.

  2. #2
    Join Date
    Feb 2012
    Location
    Kent, WA
    Posts
    216

    Default

    The correct thing to do is to just put a wire nut on the end of the white wire and don't use it. If the device you connected happened to need a neutral, most disconnects don't have an isolated bus for neutral, so you'd just have to wire nut them all together.

    Don't connect to the ground bar. Only green or bare wires can go there and I don't think white wires can be recolored. No need to anyway for your surge suppressor.
    Mark
    Kent, WA

  3. #3
    Join Date
    Jun 2015
    Location
    Middletown, CT
    Posts
    7

    Default

    Quote Originally Posted by suemarkp View Post
    The correct thing to do is to just put a wire nut on the end of the white wire and don't use it. If the device you connected happened to need a neutral, most disconnects don't have an isolated bus for neutral, so you'd just have to wire nut them all together.

    Don't connect to the ground bar. Only green or bare wires can go there and I don't think white wires can be recolored. No need to anyway for your surge suppressor.
    I did wire nut the neutral when I initially installed the disconnect . I was then reading that the surge protectors were advised so I will be adding them. As you mentioned the heat pump doesn't use the neutral and there is no isolated neutral bus in the disconnect, so I will just do what you suggest and wire the protector to L1, L2 and GND leaving the neutral unused. Thanks for your help again. It is so nice to find a website where I can get correct answers and not just somebody's opinion of what they thing is right.
    I feel pretty confident that with the help I get here I can do the bulk of the mini-split heat pump installation myself except for final testing and commissioning of the unit which requires special equipment that I don't have.

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