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Old 04-09-2011, 01:18 PM   #1
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Running a 60 amp panel from a detached garage 75 feet away


I Whant to install a sub panel in a garage thats detached from a house 75 feet away . I whant a 60 amp subpanel coming from a 100 amp service whats the allowable volt drop ? also do i have to run it in conduit undergrond and whats the hight when i come up in the house is there a code that says how high i can run it up the side of the house. and how far away does the sub panel have to be form windows or doors and how high off the floor and what size plywood would i have to mount it two. also whant to run teck cable so i was woundring if i would need to put that in conduit or not
and when i come up the walls can i use pvc or does it have to be conduit

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Old 04-09-2011, 01:33 PM   #2
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Running a 60 amp panel from a detached garage 75 feet away


This is a very often asked question here - suggest to use the search function and you'll find a wealth of information. With info here and the great help from members I installed a 100amp subpanel in my detached workshop fed by a 60 amp breaker in the main box - with a run of nearly 100' between.

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Old 04-09-2011, 07:54 PM   #3
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Running a 60 amp panel from a detached garage 75 feet away


For 75 feet you don't need to allow for voltage drop, just use the normal wire size guidelines. For 60 amps it would be 6 gauge copper (the required 4'th wire for the ground would be 10 gauge if you strung individual conductors in conduit).

Use direct burial cable 18 inches deep or conduit buried at least 6 inches deep.
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Old 04-09-2011, 10:24 PM   #4
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Running a 60 amp panel from a detached garage 75 feet away


Here's a calculator I use from time to time.....www.csgnetwork.com/wiresizecalc
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Old 04-10-2011, 04:14 AM   #5
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Running a 60 amp panel from a detached garage 75 feet away


I am in SoCal and here is a recap of my detached workshop electrical installation:
  • 100 amp GE subpanel in newly constructed detached workshop (24'x30')
  • the 100 amp breaker in the subpanel serves as the disconnect
  • 60 amp breaker in main panel
  • THWN wire
  • 2 hots - black #6
  • 1 nuetral - white #6
  • 1 ground - green #10
  • ~100' run of 1.5" conduit with two 90 degree sweeps, buried 18"
Subpanel installed between studs - in the middle of an an open studded wall (so I didn't know/care what clearance requirements are - but a search here will find where someone has stated such I am sure). The height is at about my chest level. Entry to the workshop is via an LB about 12" up the wall, directly below the subpanel. Entry to the house panel is similar.

The nuetral and ground in the subpanel are not connected. The ground in the subpanel is connected to a ufer in the concrete slab.

The workshop has 220v outlets for a MIG welder, air compressor, and heater, several 120v outlets for general use and power tools, ample lighting, and a 30 amp RV outlet.

Everything works great - and thanks to all here that helped with advice and comments along the way.

Last edited by vsheetz; 04-10-2011 at 08:41 AM.
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Old 04-10-2011, 11:33 PM   #6
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Running a 60 amp panel from a detached garage 75 feet away


Quote:
Originally Posted by AllanJ View Post
Use direct burial cable 18 inches deep or conduit buried at least 6 inches deep.
I believe your burial depths to be wrong. It's 24" for cable and 18" for conduit.

NEC 300.5
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Old 04-11-2011, 01:32 PM   #7
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Running a 60 amp panel from a detached garage 75 feet away


Quote:
Originally Posted by Saturday Cowboy View Post
I believe your burial depths to be wrong. It's 24" for cable and 18" for conduit.

NEC 300.5
Yup, that's why in my installation example the conduit is at 18".

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