Shop class is almost gone, however jewelry making, clay, and any other art classes are thriving.
Ron
I quote out machines to high schools several times each year. Seems like industrial arts is still a thing, though definitely not like when we were in high school.
Erik
Ex-SCM and Felder rep
At least one local public school offers welding classes, I know a girl who took a welding class as a HS student and is now in an extensive adult evening welding program at the school.
I don't know what else they still offer.
There is still a woodshop, metal shop, and automotive class at one of the high schools local to me. I did a teachers assistant program for the welding class several years back.
My kids in Fairfax County Virginia take what is called a Design Class but it is actually shop class. They have made cutting boards, turned pens and bowls, etc. They just don't call it shop anymore. When I visited the school and saw the shop area I was in hog heaven. They've got just about every power tool you can imagine except for routers.
Is the 20 hp sander three phase? With motors over 5 hp, it's a good idea to use three phase.
Three phase from the pole is a huge barrier. A simple rotary phase converter makes sense. I have a 20 HP motor set up as a phase converter to power a three phase panel. I paid $500. for the motor. I start it with a Dewalt corded electric drill with high RPMs, which cost about $80. I drilled and tapped a hole in the end of the motor shaft, and put a bolt in the hole. I chucked a nut driver into the drill to connect the drill to the motor. The switch to energize the motor and panel is a big old knife switch that I found in a junk pile. I get the motor spinning with the drill, pull the drill off, and throw the knife switch.
This system was sized by an electrician, and has a 70 amp breaker in the main panel. Big old 3 phase motors can be found cheap. And also, bolt the motor down.
I had no idea it was so expensive. I would do what others have said, put in multiple services. Even though it's a single building, you should be able to put in multiple services, just tell them there are going to be two tenants. That should cut the cost down dramatically.
8000sqft is not a huge grocery by modern standards, so I can see where they might not have had 3phase, but for your loads it really makes sense. I think I'd look carefully at the phase conversion options - and 480V service if possible. Even if you put in a step-up transformer to get 480V, you should recoup some of that cost by reducing the gauge of all your machine's wire runs.
Not sure if this qualifies as advice, or just my curiosity, but if this grocery operated anytime in the last 30 years, I would have assumed there is already a significant electrical system in place: HVAC, coolers, freezers, displays, lighting, etc. Is there none of that remaining that can be re-purposed for your use?
Just realized you didn't mention the service voltage you expect. The service amperage means little without this....??
Last edited by Malcolm McLeod; 01-25-2022 at 10:37 AM.
3 phase is 70k for the service provider and 44k from the electrician for 208. For 480 I would need a transformer which was another 12k. 3 phase power is just not a option for these reasons. The store was built in circa 1895 and was operated as a grocery store till about 1990 it was then gutted and it has been several different businesses. I have used it for storage for the past couple years. I currently have a 200 amp 240v service there that I assume was installedin the 90s. There are still some compressors and other refrigeration equipment still there.
$114k, ouch. How far are the lines from your building? Did they have to put in new poles? I've heard the price is all over the place. I was looking to build a shop next to my wife's house that has 3 phase in the back yard. No extra poles would be needed as it's only about 150'. The power company said to estimate about $5k to $10k but wouldn't go into detail until formal plans were in place. Her lot isn't big enough so I would have to buy a vacant lot next to it to build on. If that works out I would probably pull the trigger.
Estimating the power needed is a little trickier with 3 phase. It's not just 1/3 the current needed compared to single phase. You also need to figure out what the maximum single phase load you could have. For a woodshop it's not too bad as I don't think I've ever seen a single phase motor over 10hp.
But a large single phase kiln could draw a lot of power. A friend of a friend makes custom coffee mugs and has a medium size walk in kiln. I think she said it was on a 200 amp breaker? If so that would mean 600 amp 3 phase power (she doesn't have 3 phase). 600 amps of 3 phase power would drive a lot of woodworking tools.
I understood from your previous posts that 3ph service was cost prohibited, so I was suggesting you look at 1ph service and a DIY 3ph phase conversion. Apologies for my syntactical imprecision. You certainly seem to have investigated this thoroughly, so not likely I can be much further help.
You clearly have a dream and a plan for it, so you have my best wishes in accomplishing this. I hope at least 7500 of those square feet are your shop! And please keep us informed of progress.
A large kiln would almost certainly be 3 phase, or at least easily adaptable to 3 phase. But clearly that is moot here.