Posted by John T on June 19, 2015 at 05:59:42 from (216.249.74.3):
In Reply to: ELECTRICAL HELP posted by SKYBOW on June 18, 2015 at 20:22:20:
Skybow, As usual, anytime an Electrical or Legal question is asked, you get more responses then any other subject.
You state ".... This is my last go around at building a workshop, so I want it to be right. ..."
It sounds like you don't have any high amperage loads planned (maybe 15 to 20 amps MAX), its NOT like you're powering a Machine Shop with welders and huge air compressors etc. HOWEVER if you're going to power a garage its not all that much harder or expensive to install say at least a 60 amp service with BOTH 120 and 240 volts so you have two separate 120 volt leg/branches (say 1 or 2 for receptacles and another for lights) PLUS 240 available for a small air compressor etc. or future expansion. I say that even though your post talks like maybe 15 to 20 amps is all you need ITS NOT ALL THAT EXPENSIVE OR DIFFICULT TO RUN a 60 AMP 120/240 service which allows for expansion versus ONLY 20 or 30 amps to the garage.
That being said plus your comment "This is my last go around at building a workshop, so I want it to be right" here is what I recommend:
Install a 60 amp two pole branch circuit breaker in your homes panel.........
Run Four No 6 THHN Copper Conductors in PVC type conduit to the Garage (2 UnGrounDED Hots L1 & L2, One Grounded Conductor Neutral, One Equipment GroundING Conductor. NOTE you could use No 4 to reduce voltage drop if that was an issue.
In the Garage install a 120/240 volt 60 Amp SUB Panel which has the Ground Buss separate and insulated from Neutral Buss. The panels metallic tub case/frame bonds to the Equipment Ground Buss but NOT the Neutral Buss
Out of the garage SUB Panel you could run one or two 20 amp 120 volt 3 #12 wire branch circuits to 20 amp 120 volt NEMA 5-20R convenience receptacles.
I would power a lighting branch circuit by itself and NOT mix it with a receptacle branch circuit.
In a concrete floor garage, I would use GFCI receptacles.
NOTE if you wanted to power say a freezer out there, it can be NON GFCI provided its a single (NOT duplex) receptacle in a non readily accessible location (say hidden down behind the freezer) as best I recall but no warranty as codes may have changed
NOTE IF YOU WANT TO RUN ONLY A 30 AMP CIRCUIT out there, Id still run BOTH legs so you have 120 and 240. Still it would require you to run FOUR wires (2 Hots, Neutral, Ground) and still, yes, you can have two legs of 120, L1 & L2. You're talking No 10 or No 8 wire in this case (to allow for voltage drop which depends on amps and distance and wire size) and a 30 amp 2 Pole Branch Circuit Breaker in the homes main panel. YES A BIT CHEAPER THEN THE 60 AMP SERVICE I SUGGESTED. If you want to run a 100 amp service out, the its bigger wire and bigger breaker etc. etc.
Its your money and your choice. If in doubt I advise you to check with your utility provider and local authority and the NEC if applicable and if adopted (and if so what version) in your jurisdiction and do as they say NOT any of us here!!!!!!!!!!!!!
John T Longgggggg retired AC Power Distribution EE so no warranty, check with local utility and authority
PS NOTE you asked if running 10/2 would be better ??? YES its better then 12 to reduce voltage drop BUTTTTTTTTTT to "split" and have TWO 120 volt branch circuits in the Garage, YOU STILL NEED FOUR WIRES NOT JUST THREE That would be 10/3 plus Ground. And in the Garage you still want the Neutral and Ground Busses separate and isolated.
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