Overhead to garage

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Old 12-06-18, 12:11 PM
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Overhead to garage

I currently have 120v going to my garage with overhead wiring. It has one insulated and bare neutral. I want to run 240v to the garage. Am I able to run 2 insulated and bare neutral to a sub panel with itsi own ground?
 
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Old 12-06-18, 12:49 PM
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No. You can only have one power feed to a detached structure. You will need to abandon the current 120v feed and install a sub panel supplied by two hots, one neutral, one ground.
 
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Old 12-06-18, 01:07 PM
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The present setup is incorrect as it stands. You are not permitted to have a bare neutral or combined neutral/ground with the hot wire wrapped around it..

But you can add a second hot and an (insulated) neutral which together with the existing wires and all juxtaposed will give you the desired 120/240 volt feed assuming they are all fat enough for your expected electric load.

The first panel in the outbuilding (your proposed subpanel) needs both a ground wire (equipment grounding conductor) back to the feeding panel and ground rod(s) (normally two) just outside.
 
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Old 12-14-18, 08:15 AM
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So, I need 4 insulated and a messenger wire to support? How do I attach to the messenger? What wire designation do I need to use? I know the gauge depends on power needs.
 
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Old 12-14-18, 10:40 AM
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UF-b cable. Use sunlight resistant wire ties to hold to a messenger such as plastic coated 1/8' steel cable. The messenger must be grounded at one end.
 
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Old 12-14-18, 11:49 AM
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I'm used to running Romex and conduit, so this overhead stuff is new to me. If the messenger wire has to be grounded at one end, why can't it be grounded at both and serve as the ground? Thank you for all your help!
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Old 12-14-18, 12:37 PM
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The steel cable isn't rated for electrical work but for safety needs to be grounded.
 
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Old 12-14-18, 02:33 PM
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The messenger cable would have to be ACSR electrical grade which is a mixture of steel and aluminum strands to use it as the ground. Plain steel makes a poor electrical conductor outside due to surface corrosion. A plain messenger wire is usually grounded through the attachment to the steel conduit mast.
 
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Old 12-14-18, 02:46 PM
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Note since xx-3 UF-b contains a ground it is pretty much a moot point. If you use quad plex the messenger is rated for use as a ground,

As I recall you were running a 60 amp circuit. Finding #6 (#4 al) quad plex would be more difficult though you could of course go larger. I therefore just went with UF-b.
 
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Old 12-18-18, 09:57 AM
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A #8 aluminum quad is all that's necessary for 60 amps in free air, but it would be a special order. I'd just use the UF-B like Ray suggested.
 
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Old 12-21-18, 11:47 AM
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Where I live, it's all special order. When I went in the small town lumber yard, they didn't even know what ufb was. When they checked they couldn't even special order it for me. Thank y'all for your insight and know how.
 
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