Sub panel to shed

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Old 08-13-19, 08:21 PM
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Sub panel to shed

I am wanting to install a sub panel (100amp) on the outside of my house. From that panel I want to supply a 12' 24' shed that will be used as a school/playroom (we homeschool) with a small area partitioned off for my workspace. Eventually I may run power (for lights) to a barn from the same sub panel.* Sub panel would be ~65` from the main panel. Main panel is on the back porch. Shed is ~125` from where the sub panel would be and would have another panel to supply lights, 8-10 outlets and a window style AC unit / space heaters.

Run from main to sub panel would be above ground through conduit. Run from sub panel to shed would be underground.*

What size breakers and wires will I need to supply the sub panel?

What size breakers and wires will I need to supply the shed's panel from the sub panel?**
*
 
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Old 08-13-19, 08:48 PM
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What types of tools/machines would be running in your shop? What size heaters would you be installing?
 
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Old 08-14-19, 07:48 AM
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You need to calculate the anticipated loads and also do a voltage drop calculation to determine breaker and wire size.
 
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Old 08-14-19, 10:13 AM
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A 20 gallon air compressor and charging for drill batteries will be the main tools used in the workspace with the occasional skill saw/miter saw.
I'll have to figure out what kind of space heater I'll get but it will be a medium sized one from walmart or something similar.
 
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Old 08-14-19, 11:52 AM
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This is shooting from the hip without knowing potential amp loads but will most likely fill your needs with no problems. From a 100A breaker in the main panel to the subpanel I'd use 1-1-1-6 in aluminum XHHW-2 conductors if using conduit from panel to panel. For the direct bury run from house subpanel to shed subpanel I'd use 2-2-4-6 Mobile Home Feeder (MHF) and protect it with a 60A breaker in the house subpanel. The shed subpanel can also be a 100A panel and I suggest it to be a main breaker panel. The subpanel at the house only needs to be a main lug panel.
 
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Old 08-14-19, 04:30 PM
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Awesome that helps alot! Thank You!!!


 
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