where do I connect the white wire?
#1
03-02-14, 01:47 PM
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where do I connect the white wire?
Trying To Wire 240 Volt 30 Amp Receptacle To My SuB box. Have A New 30 Amp Breaker And 8/3 Nmb Wiring. Problem Is I Don't Know Where To Put The White Wire. Is My SuB c Box WireCorrectly?
#2
03-02-14, 01:52 PM
Group Moderator
Welcome to the forums.
No.... your sub panel is not wired correctly. It required three wires and a ground.
You are missing the neutral.
There should be a neutral wire connected to the block where the ground currently is and there should be an additional block added for ground connections.
No.... your sub panel is not wired correctly. It required three wires and a ground.
You are missing the neutral.
There should be a neutral wire connected to the block where the ground currently is and there should be an additional block added for ground connections.
#3
03-02-14, 01:57 PM
Welcome to the forums! Your white wire should be attached to the neutral buss, and since it is a sub panel, you should have a grounding buss attached to (not isolated) to which your grounding rod electrode and bare from your service is attached.
Pete types faster than me.
Pete types faster than me.
#4
03-02-14, 02:00 PM
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Thank You. It Doesn't Appear That There Is Room For Another BaR, Do I Have To Replace The Box? Thanks FoR Such A Quick Response!
#6
03-02-14, 03:07 PM
Forum Topic Moderator
You need to install a bushing on the conduit that has the conductors supplying your panel.
The panel label should show where a ground bar can be added to the panel.
Last edited by pcboss; 03-02-14 at 03:24 PM.
#7
03-02-14, 03:24 PM
Bushings
The conductors feeding the box look like at least #4 to me, but I could be wrong. What size are they? The conduit thread is extending so far into the box that it looks like the wire is already bent into the sharp edge. 344.46 says wires need a bushing to be protected and that looks like rigid or running thread and not an EMT box connector. Wire needs to be protected 300.4(G) just says it's mandatory for #4 and larger not that anything under #4 does not need a bushing.
#8
03-02-14, 03:57 PM
Group Moderator
It looks like two holes above the breakers for a ground bar. Since it's a pipe nipple entering the box it could indeed use a bushing.
#9
03-03-14, 05:03 AM
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Thanks Everyone, I Appreciate The Help. I'll Add ThE Bar And Bushing As Suggested. Do I Simply Run A White Wire From The Neutral Bus In The Service Panel To The Existing Bus In ThE Sub Panel Or Do I Need To Replace The Existing Wire With new 6/3 Nmb ThaT Contains All Wires I Need?
#10
03-03-14, 06:46 AM
If the original wiring to the subpanel was NM-b you can't just add a white wire. If it was NM-b not in conduit replace it with new 3-conductor NM-b based on the feeder breaker size. If it was xx-2 NM-b in continuous conduit replace with four THWN sized to feeder breaker. If this is not in the same building as the main breaker you probably can't use NM-b and you will need a ground rod.
#11
03-03-14, 06:49 AM
Neutral from existing panel buss to subpanel buss. Was there no neutral with the SE you pulled to the sub panel? Needs to be one to the neutral bar. (Edit: I see the braid) Also, I lose track of your neutral from your outgoing cable in the lower right. It is not attached to the buss bar that I can see. You've gotta take the entering cable loose to install the bushing, so may as well run the neutral.
#12
03-03-14, 07:22 AM
Forum Topic Moderator
If that is a pipe connector or nipple I agree with the need for a bushing.
It looked like SE-U cable where SE-R or individual conductors should have been used.
It looked like SE-U cable where SE-R or individual conductors should have been used.
