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Old 09-05-2011, 05:57 PM   #1
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Electric to outbuilding in backyard


Thinking of three strings of wires in the outbuilding. One 15 amp string for the four light boxes, one 20 amp string for the six receptacles, and one 30 amp string for a future A/C. (not sure if I'll get a portable unit or a split unit ductless). The inside square footage is approx. 165sq ft.

Question is what would the wire diagram look like to the main panel at the house. Should I have a sub-panel in the outbuilding or run the three wires directly to the main panel?

In this scenario, I'm assuming I'll need some combination of 65 amps at the panel. What are the possible wire configurations from the panel to the outbuilding? Should I restructure my thinking from the first paragraph above?

Thank you for your time experts
OMW

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Old 09-05-2011, 06:00 PM   #2
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Electric to outbuilding in backyard


You can not run 3 circuits to an outbuilding.

I would run conduit, and #6 wire to install a subpanel.

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Old 09-05-2011, 06:14 PM   #3
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Electric to outbuilding in backyard


Thank you jbfan
What amp fuse at the panel would I need for a #6 wire from panel to sub panel?
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Old 09-05-2011, 06:17 PM   #4
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Electric to outbuilding in backyard


60 amp breaker at the main panel, 4 wires to the shed, 2 hots, a neytral and a #10 ground.
At the shed you need a disconnect for the building, and 2 ground rods.
Keep the neutral and ground seperate in the subpanel.
A 100 amp main breaker panel works well as this is the disconnect.
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Old 09-05-2011, 06:27 PM   #5
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Thank you
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Old 09-05-2011, 06:33 PM   #6
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Electric to outbuilding in backyard


Quote:
Originally Posted by oscarmw View Post
Thank you
Any time, thats what we get paid for!

Do a search and you can find more info on subpanels and outbuildings.
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Old 09-05-2011, 09:27 PM   #7
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Electric to outbuilding in backyard


Quote:
Originally Posted by jbfan

Any time, thats what we get paid for!

Do a search and you can find more info on subpanels and outbuildings.


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Keep in mind I'm not only a newbie, but I haven't done any electrical work like this before, but want to learn. Would I have to cut a hole in the main panel to get the new wires to the shed via the house attic? I think it would be easier and cheaper to run wire to the shed through the attic as opposed to trenching 18".
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Old 09-05-2011, 09:30 PM   #8
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Electric to outbuilding in backyard


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Here is a picture of my panel
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Old 09-05-2011, 09:31 PM   #9
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Another pic
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Old 09-09-2011, 10:23 PM   #10
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Electric to outbuilding in backyard


Have yet to figure out a supply list for this project. To review- it is a newly built 168 sq ft wood shed. It is a shell now. Open walls/ no insulation. It will be used as a study/TV room. Amp draws will be:
2 computers
1 printer
1 scanner
1 cable modem
1 55" plasma TV
1 DVR
1 DVD player
1 cable box
1 surround sound system
3 light sources (2 floor, 1 ceiling)

1 115v window AC
1 floor heater for rare cold nights


The main panel is 120 ft away from the building. Would like to have a sub panel at the outbuilding, running electric wire through the attic of the house to the main panel. The main panel is a Bryant brand (cat no. 20-40) MAX MAIN RATING 200 AMPS. It has 4 empty slots with the following existing breakers (six 15 amp, twelve 20 amp, four 30 amp, four 50 amp, two 125 amp)

What do you guys suggest for a supply list?



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Old 09-14-2011, 10:36 PM   #11
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Electric to outbuilding in backyard


Hey out there................******************

Have yet to figure out a supply list for this project. To review- it is a newly built 168 sq ft wood shed. It is a shell now. Open walls/ no insulation. It will be used as a study/TV room. Amp draws will be:
2 computers
1 printer
1 scanner
1 cable modem
1 55" plasma TV
1 DVR
1 DVD player
1 cable box
1 surround sound system
3 light sources (2 floor, 1 ceiling)

1 split unit ductless AC
1 floor heater for rare cold nights


The main panel is 120 ft away from the building. Would like to run electric wire through the attic of the house to the main panel. The main panel is a Bryant brand (cat no. 20-40) MAX MAIN RATING 200 AMPS. It has 4 empty slots with the following existing breakers (six 15 amp, twelve 20 amp, four 30 amp, four 50 amp, two 125 amp)

What do you guys suggest for a supply list?
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Old 09-14-2011, 10:49 PM   #12
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Electric to outbuilding in backyard


Does the out building face the panel?

You should be able to come from the bottom of the panel, then underground to the shed.
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Old 09-14-2011, 11:19 PM   #13
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The outbuilding does not face the building. Would rather go through the house attic with the electrical wires (cheaper and easier)
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Old 09-14-2011, 11:20 PM   #14
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Electric to outbuilding in backyard


Do you think the existing main breaker can handle an additional 15 & 20 amp breaker?
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Old 09-14-2011, 11:39 PM   #15
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Electric to outbuilding in backyard


you're gonna have to come outside and go underground at some point, and coming out the top of a outdoor panel is tricky but doable.

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