Re: Shop Wiring

Posted by John T on October 17, 2022 at 10:00:38 from (45.16.200.171):

In Reply to: Shop Wiring posted by Danny Prosser on October 17, 2022 at 06:10:31:

Hi Danny, good questions, I will answer and provide my comments BUT NO WARRANTY IM LONG RETIRED FROM POWER DISTRIBUTION ENGINEERING and rusty as an old nail lol:

QUESTION 1 The 30 amp breaker will be for my welder which the plug will be right below the box. Will 10/2 be big enough for that 1 foot run?

If you run a 30 Amp branch circuit (if that suffices for your welder????) especially such a short distance, 10/2 Copper with Ground will suffice. Assuming its 240 Volt (requires a TWO Pole Circuit Breaker) that's Two Hots L1 & L2 and one Equipment GroundING Conductor. If it were 120V which I doubt, that's One Hot, One Neutral, One Equipment GroundING Conductor still 10 Gauge for 30 Amps.

NOTE if you ever want to allow for expansion, say you used an AC 200 or so Amp Buzz Box stick welder, most require a 50 Amp 240 Volt service, which requires 6 Gauge Copper Conductors and of course a Two Pole 50 Amp Circuit Breaker.

QUESTION 2

Also I got some 4 tube drop in ceiling fixtures that use F32T8 tubes. How many of those can I daisy chain together on one 15 amp breaker.

I do not know how many watts (bulbs plus ballast) those individual fixtures require, so I cant say. HOWEVER here are some basics: If you were to use a 15 Amp Lighting Branch Circuit (14 Gauge wire protected with a 15 Amp Circuit Breaker) do NOT use more fixtures that in total draw over 80% or 12 Amps of current, which equates to a total of 1440 Watts for ALL fixtures combined. If you used a 20 Amp Branch Lighting Circuit, that could total a maximum 80% of 20 = 16 Amps or 1920 Watts total. NOTE FWIW I NEVER SPECIFIED AND DESIGNED THAT CLOSE TO THE LIMITS IN ALL MY YEARS OF PRACTICE EVEN IF PERMITTED BY THE NEC NOTE I would consider LED instead for sure to get more Lumens per watt (more fixtures allowed per branch circuit) and longevity YOUR CHOICE NONE OF OURS

QUESTION 3 Also how many single recepticles can I put on one? And I'm assuming 12/2 will be good for all of that.

SAME AS ABOVE for a 20 Amp Convenience Outlet Branch Circuit (12 Gauge wire and 20 Amp Breaker) the MAXIMUM Continuous Current would be 80% of 20 or 16 Amps. HOWEVER its good engineering and practice to run more than one branch circuit, perhaps 2 or 3 so receptacles are staggered around fed by different circuits. Typically I never placed many more than 8 duplex receptacles on a 20 Amp Branch Circuit even if more were allowed, BUT THAT DEPENDED ON THE APPLICATION.....

NOTES A garage/shop type structure with a concrete floor typicaly requires GFCI protection on convenience outlets. That can consist of GFCI receptacles orrrrrrrr the use of GFCI Circuit Breakers in the panel. I would ONLY use Spec Construction Grade receptacles not cheap big box store grade.

NOTES Assuming this is fed from a home panel ??? it needs to be configured as a SUB PANEL which means it has Separate Isolated and Insulated Neutral and Ground Busses, and for 120/240 Volt service, that requites FOUR Conductors, Two Hots L1 & L2, One Neutral, One Equipment GroundING Conductor plus the buildings electrical service (last time and jurisdictions where I practiced at least) requires bonding to a proper Grounding Electrode(s).......

Hope this helps, post back any questions. As always where fire and life safety are concerned if in doubt consider consulting the NEC if and where applicable and professional electricians or engineers DO NOT TAKE MY WORD FOR ANY OF THIS.....

John T

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