Wiring a new shop
#1
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Wiring a new shop
Finished building a 900 sqft shop detached and about 12 ft. away from the main garage. I’d like to get a sanity check on my plans to wire the electrical and choice of load center for the shop.
My loads are estimated at the following:
220V
Band saw – 10 amps
Heater - 20 amps
Compressor - 15 amps
Table Saw – 10 amps Welder 10amps
110V
Fluorescent Lights 13 x 1 amp
Garage door openers - 3 amps
Grinder - 10 amps
Drill Press - 10 amps
Drill - 10 amps
Chargers - 3 amps
Vac -5 amps Saws – 2 x 3 amps Attic Vent fans 2 x 2 amps
So I’m estimating a 60amp breaker in the basement loadcenter, and a run of #6 (red, white, green, bare) to the loadcenter in the shop with a main 100amp breaker acting as the disconnect. Splitting the ground and Neutral busses, and bonding to a couple of copper ground bars outside the shop, and the rebar of the foundation. I use GE PowerMark Gold 100 AMP 20-Space 20-Circuit Indoor Main Breaker Value Kit which has 5 each 20amp 120V breakers. Doing GE because the main house already has GE load centers,
I had a 2” PVC conduit laid in the foundation from the garage of the main house. It’s 4 feet deep between the structures with the sweeps. If I pull the power through that conduit, can I also drop a communications (Ethernet cat5e) cable in the same conduit? Also, can I use a cable of 4 conductor #6 from the basement load center and enter the conduit to the shop from the garage?
Thanks.
-=Phyber
My loads are estimated at the following:
220V
Band saw – 10 amps
Heater - 20 amps
Compressor - 15 amps
Table Saw – 10 amps Welder 10amps
110V
Fluorescent Lights 13 x 1 amp
Garage door openers - 3 amps
Grinder - 10 amps
Drill Press - 10 amps
Drill - 10 amps
Chargers - 3 amps
Vac -5 amps Saws – 2 x 3 amps Attic Vent fans 2 x 2 amps
So I’m estimating a 60amp breaker in the basement loadcenter, and a run of #6 (red, white, green, bare) to the loadcenter in the shop with a main 100amp breaker acting as the disconnect. Splitting the ground and Neutral busses, and bonding to a couple of copper ground bars outside the shop, and the rebar of the foundation. I use GE PowerMark Gold 100 AMP 20-Space 20-Circuit Indoor Main Breaker Value Kit which has 5 each 20amp 120V breakers. Doing GE because the main house already has GE load centers,
I had a 2” PVC conduit laid in the foundation from the garage of the main house. It’s 4 feet deep between the structures with the sweeps. If I pull the power through that conduit, can I also drop a communications (Ethernet cat5e) cable in the same conduit? Also, can I use a cable of 4 conductor #6 from the basement load center and enter the conduit to the shop from the garage?
Thanks.
-=Phyber
#2
Welcome to the forums!
Just as a note: Nominal voltage is 120/240, not 110/220.
No, you may not unless the insulation rating of the cat5 is 240 volts or higher. All the wires in the conduit are require to be the same or higher then the voltage in the pipe. Also it is never a good idea to run network and electric in the same pipe.
You can, but it is required to be UF cable. You can not use NM-b in conduit outside even if it is underground.
Just as a note: Nominal voltage is 120/240, not 110/220.
If I pull the power through that conduit, can I also drop a communications (Ethernet cat5e) cable in the same conduit?
Also, can I use a cable of 4 conductor #6 from the basement load center and enter the conduit to the shop from the garage?
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So I can run 6-3 UF-B W/G from the new load center through the conduit into the garage, and then exposed through the garage into the basement load center?
-=Phyber
-=Phyber
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If I run individual wires, they can go in the underground conduit?
But they will also need to be in conduit through the garage to the basement load center?
-=Phyber
But they will also need to be in conduit through the garage to the basement load center?
-=Phyber
#6
So I can run 6-3 UF-B W/G from the new load center through the conduit into the garage

#7
a run of #6 (red, white, green, bare) to the loadcenter in the shop with a main 100amp breaker acting as the disconnect
#8
Or black black instead of black red. If you need say forty feet of cut wire then for the black you might be able to buy a 100 foot roll cheaper than two 40 foot cuts of black and red.
If you ran the individual conductors in the garage and basement, yes, but you can transition to 6-3 NM-b in the basement and at the garage the subpanel should be located as close as possible to where the conduit comes up so you would need only a few feet of conduit. If you have to put it on the other side of the garage you can transition to NM-b once your inside the garage.
But they will also need to be in conduit through the garage to the basement load center?