A/C unit disconnect wiring?

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Old 05-27-15, 07:58 PM
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A/C unit disconnect wiring?

Bought used mobile home. Tear down process while disconnecting A/C unit I observed wiring. 10/3 wire with grounds cut off for feed and THHN to unit. 2 black, 2 red, I know both hot,no need for neutral. There is a green THHN connected to middle bus and and the white wire of the 10/3 feed connected to middle bus. The white is also connected to the isolated neutral bus in the main panel. From what I know and researched this is wrong!! Why was it done this way and why us it working and shoukd i redo it?
 
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Old 05-28-15, 04:13 AM
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You have only one panel supplying the home & the A/C ?

If so , that makes it a service entrance panel . You probably have a green screw going through the neutral bar & threaded into the metal " can " ( enclosure ) of the panel . This , for all practical purposes , means that grounds and neutrals were terminated on the neutral bar . ( I like to add a separate ground bar . )

If there is a main before power gets to the panel , than the neutrals are on the neutral bar and grounds on the ground bar & no green screw through the neutral bar .

Let us know and I will reccomend corrective action .

God bless
Wyr
 
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Old 05-28-15, 10:59 AM
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Main disconnect is on pole. Then there is service panel in home. Neutral/ground are not bonded in the home panel.
Thx and God bless as well
 
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Old 05-29-15, 01:39 AM
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Then you should have 2 hots , a neutral and an earth ground coming into the house panel . You should have a ground bar screwed to the panel can / enclosure and the neutral bar should not be bonded to the panel can / enclosure .

All the earth grounds should be moved to the newly installed ground bar . Any white conductors being used as an equipment grounding conductor can be marked with green tape , at each end , to identify them as grounds ( and not neutrals ) .

God bless
Wyr
 
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Old 05-29-15, 02:23 PM
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Why would technician have cut grounds and used white as ground then connected to neutral in panel? Curiosity
 
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Old 05-29-15, 08:54 PM
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Why would technician have cut grounds and used white as ground then connected to neutral in panel?
He probably didn't know any better. Unfortunately, some HVAC techs should not be doing AC wiring.
 
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Old 05-30-15, 01:50 AM
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I do not have any better answer than that , either . :-(

God bless
Wyr
 
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Old 06-01-15, 03:44 PM
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Lol kinda what I figured!!
 
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