raider1

I don't deal with many large HP motors, so it has been a long time since I have had to deal with one.

The area I work in as an inspector doesn't have any industrial areas so large motors really aren't an issue. When I was working as an electrician I dealt with large pump motors, compressor motors ect...

Chris

Controls Guy

One more thing, since I have never installed a motor this size with the pipe coming out of the concret. What would you recommend the distance of the stub up from the junction box of motor. Looking at article 373 if I'm using 400 or 500 mcm that turn is going to be a bear. I dont have the luxury of coming directly from the bottom because manufacturing and dimensions are not complete but slab is waiting to be constructed.

frenchelectrican

Control Guy;

if you know what manufacter the motor i am sure they will have a drawing on line or get ahold of them drict they will give you the demison of the motor and my SOP with larger motor i useally ask them to give me oversized peckerhead[s].

i done quite few large motor installments both low and med voltage catory.

the med voltage that diffrent story i will leave this part out for now due you mention 480 volts here.

the size of conduit will be determed by size of conductor and distance.

and will this motor run with VFD or not ?

Merci,Marc

__________________
Pas de problème,il marche n'est-ce pas?"(No problem, it works doesn't it?)

randomkiller

I would keep it back @30" if possible and stay pretty low so you can install a coupling and go to greenfield or sealtite from there to the jbox.

__________________
A Veteran - whether active duty, retired, guard or reserve - is someone who, at one point in his life, wrote a blank check made payable to "The United States of America," for an amount of "up to and including my life."

"One Nation Under God"

frenchelectrican

That is pretty much SOP i did see most area i work on med /large motor installment.

Merci,Marc

__________________
Pas de problème,il marche n'est-ce pas?"(No problem, it works doesn't it?)

micromind

Same here, it's best if you make the top of a rigid coupling stick about 1/2"above the slab. You'll need all you can get to bend the flex/sealtite from the coupling to the motor. On most of these motors, you can remove the entire box, and re-install it in 90 degree increments.

Rob

P.S. I've connected some pretty good-sized motors on fans and conveyers, etc. the biggest fan I can remember was for a baghouse on an asphalt plant, 2-200HP driving the same fan shaft, (400HP total), the biggest conveyer was at a rock crushing plant, 300HP, about 1/4 mile long, and uphill. The biggest crusher motor was 1500HP, on a jaw-type crusher that would take a rock 6' in diameter and crush it to 3".

Controls Guy

Thanks a lot for all the feed back and help. I had asked one of the local contractors and he had said at least 24" or more so thanks for confirming that. I have the motor specs and dims but not where the motor is exactly sitting on the skid was the reason for my concern. After this one I'll be hopefully helping someone.

Kletis

I could not tell you if Brits use this term as well, but a journeyman is someone who has completed the appropriate training and passed their tests to become an Electrician. When you are no longer an apprentice but instead a true electrician, you are a journeyman. They use this term in many fields. My dad, for instance, is a journeyman lineman.......

Hope that answered your question!!

__________________
Kletis...

Ecopat

Ahhhhhhhh, got you now. Thankyou kind sir.

__________________
"Quid non Resolutio"

wwilson174

In the absence of nameplate data I have always used 1.2 amps per horsepower @ 480v 3 phase times 125% for runs up to 70 feet. Bill W.

MechanicalDVR

How did you get the 1.2 amps?

wwilson174

40 years experience!

nap

a 250 hp dust collector. would that fall into one of those catagories?

nap

three levels of skilled tradesman

apprentice

journeyman

master

In old days (back during the days of the guilds which were originally from GB), a person entered into a trade as an apprentice. He was taught by a master. Once the apprentice became skilled enough, he was considered able to journey about the country and ply his trade, hence the term, journeyman. When he became skilled enough, he would be considered a master tradesman and considered to be well enough qualified to train apprentices. Masters typically would be an owner of a shop and would employ journeymen and apprentices.

randomkiller

Sure wouldn't, that would fit the code wording.

__________________
A Veteran - whether active duty, retired, guard or reserve - is someone who, at one point in his life, wrote a blank check made payable to "The United States of America," for an amount of "up to and including my life."

"One Nation Under God"

nap

I was referring to you catagorization of:

Not sure I would consider it any of these. Basically making the statement in opposition of your statement.


Now what are you referring to with "the code working"?

randomkiller

I know what you meant and I was basically agreeing with you that it wasn't one of the quoted types, so it would fit into the wording of the code.

__________________
A Veteran - whether active duty, retired, guard or reserve - is someone who, at one point in his life, wrote a blank check made payable to "The United States of America," for an amount of "up to and including my life."

"One Nation Under God"

nap

I guess it was late and it just didn't make sense at the time.

randomkiller

I hear that, I worked until 2130 last night and couldn't go to sleep and ended up just about dozing off on the keyboard.

__________________
A Veteran - whether active duty, retired, guard or reserve - is someone who, at one point in his life, wrote a blank check made payable to "The United States of America," for an amount of "up to and including my life."

"One Nation Under God"