MikeOD
New member
- Location
- Milford, CT, USA
Hello all,
I'm new here, and I've got a bunch of questions.
I'm setting up a new shop. In the main service panel, I've got 120V/240V high leg delta, 3 phase, 4 wire (I'm not sure I got the nomenclature right but, the voltages are : Vab = Vac = Vbc = 240V, Van = Vcn = 120V, Vbn = 208V, sorry, my background is mainly DC power, control systems, and electronics, it's been almost 20 years since I've dealt with 3 phase, and I'm not an electrician). There is a secondary panel tied to the side with 120V for outlets and lighting.
I've got a 5hp compressor and 1.5hp(?) table saw in the far corner (nameplate 19.1 amps and 7.5 amps respectively, both 230V single phase).
The run (in the way I was planning to run the conduit) is 130'.
I was planning on installing a 30A, 220V single phase for the compressor, and 15A, 220V single phase for the table saw. I calculated I needed to pull #6 THHN and #10 THHN for those two circuits.
Question 1: Did I size my wire correctly? I think I could do #8 for the 30 amp but, went up one size for voltage drop.
Question 2: Is it okay to pull both circuits through the same conduit?
Question 3: Assuming Q2 is yes, (with the first box holding a NEMA 6-30 outlet and the second holding a NEMA 6-15 outlet) can I daisy chain the grounds or does each circuit require its own ground?
Question 4, If yes to daisy chain, would that be a single #6 ground, or can it be a single #8 ground?
Depending on what is code on the ground size and quantity, I think I can do this in 3/4 EMT. But, that seems unwise...
I was considering pulling in the 3 phase power with the neutral now, as when these machines get upgraded (as well as the 120V thickness planer now connected to existing outlets), I'll likely go to larger, 3 phase machines. I figure a combined 13 HP would be possible on a 220V, 3 phase, 50A sub panel (I'm not sure about that), but I think it will get too pricey to do 3 phase right now, as I'm struggling with the budget. So, that gets to my last question.
My zoning expert informed me that only a licensed electrician can pull the permit for a commercial location. So, it looks like none of this will be me but, I'm running my compressed air piping now (I mean, right now, at 11 on Sunday night, and again tomorrow morning, hopefully finished early Tuesday). I'd like to hang the conduit as well, as I'm already there, and it would save me a little to take this bit of grunt work away from the electrician. And, really, new shop, which wasn't planned, and new baby, which was, but is turning out to be a lot more expensive than planned, I'm really not exaggerating when I say I've got to watch every single dollar. I'm thinking I might as well size the conduit for the future 3 phase + Neutral 50A box. So, that's the point of the subject line and my final question. What size wire would I need to run to a 3 phase, 50 Amp sub at 130'?
Any and all help and advice is truly appreciated.
Regards,
Mike O'D
I'm new here, and I've got a bunch of questions.
I'm setting up a new shop. In the main service panel, I've got 120V/240V high leg delta, 3 phase, 4 wire (I'm not sure I got the nomenclature right but, the voltages are : Vab = Vac = Vbc = 240V, Van = Vcn = 120V, Vbn = 208V, sorry, my background is mainly DC power, control systems, and electronics, it's been almost 20 years since I've dealt with 3 phase, and I'm not an electrician). There is a secondary panel tied to the side with 120V for outlets and lighting.
I've got a 5hp compressor and 1.5hp(?) table saw in the far corner (nameplate 19.1 amps and 7.5 amps respectively, both 230V single phase).
The run (in the way I was planning to run the conduit) is 130'.
I was planning on installing a 30A, 220V single phase for the compressor, and 15A, 220V single phase for the table saw. I calculated I needed to pull #6 THHN and #10 THHN for those two circuits.
Question 1: Did I size my wire correctly? I think I could do #8 for the 30 amp but, went up one size for voltage drop.
Question 2: Is it okay to pull both circuits through the same conduit?
Question 3: Assuming Q2 is yes, (with the first box holding a NEMA 6-30 outlet and the second holding a NEMA 6-15 outlet) can I daisy chain the grounds or does each circuit require its own ground?
Question 4, If yes to daisy chain, would that be a single #6 ground, or can it be a single #8 ground?
Depending on what is code on the ground size and quantity, I think I can do this in 3/4 EMT. But, that seems unwise...
I was considering pulling in the 3 phase power with the neutral now, as when these machines get upgraded (as well as the 120V thickness planer now connected to existing outlets), I'll likely go to larger, 3 phase machines. I figure a combined 13 HP would be possible on a 220V, 3 phase, 50A sub panel (I'm not sure about that), but I think it will get too pricey to do 3 phase right now, as I'm struggling with the budget. So, that gets to my last question.
My zoning expert informed me that only a licensed electrician can pull the permit for a commercial location. So, it looks like none of this will be me but, I'm running my compressed air piping now (I mean, right now, at 11 on Sunday night, and again tomorrow morning, hopefully finished early Tuesday). I'd like to hang the conduit as well, as I'm already there, and it would save me a little to take this bit of grunt work away from the electrician. And, really, new shop, which wasn't planned, and new baby, which was, but is turning out to be a lot more expensive than planned, I'm really not exaggerating when I say I've got to watch every single dollar. I'm thinking I might as well size the conduit for the future 3 phase + Neutral 50A box. So, that's the point of the subject line and my final question. What size wire would I need to run to a 3 phase, 50 Amp sub at 130'?
Any and all help and advice is truly appreciated.
Regards,
Mike O'D
