Help wiring compressor

[sberry]

Its a game for me but even knowing as little as I do about it can do the math and figure if there was a real danger to the OP here there would be another 6 masters letting us know vs a knob or 2 one being even less qualified than I am and that gets pretty low.

In the real world in his garage he has a wire in excess of 125% of the motor demands, I can buy that as being safe.

 

[CoopVA]

Its a game for me but even knowing as little as I do about it can do the math and figure if there was a real danger to the OP here there would be another 6 masters letting us know vs a knob or 2 one being even less qualified than I am and that gets pretty low.

 

[2Big2Ride]

Since the subject seems to come up every other week, perhaps one or two of the real sparkies could make a simple chart with horsepower, given amp rating for HP, the 125% factor, the wire required to support the HP (both NM and THHN/THWN), the circuit breaker rating, and if hard wiring is required or if it can have cord and and HP rated receptical. Then get one of the moderators to make a sticky... And a note that a disconnect is required if compressor is not in line of sight of the breaker.

 

[CoopVA]

Since the subject seems to come up every other week, perhaps one or two of the real sparkies could make a simple chart with horsepower, given amp rating for HP, the 125% factor, the wire required to support the HP (both NM and THHN/THWN), the circuit breaker rating, and if hard wiring is required or if it can have cord and and HP rated receptical. Then get one of the moderators to make a sticky... And a note that a disconnect is required if compressor is not in line of sight of the breaker.

Not promising anything, but, I will see what I can come up with...

 

[wyliesdiesels]

Hats off to CoopVa and 2manyprojects. Ive been sick and didnt have time to join in the debate over code. But i think 2manyprojects covered it pretty well. And yes i do this for a living....

To TreyT- u definitely sound like the engineer type to me!

 

[GYPSY400]

Lol.. wow.. 13 page thread on something a guy can Google in 5 minutes.. im not going to reiterate was has been said 30 times before. . But yeah.. maybe a little less time on the computer boys, and a little more time actually doing something IN your garage. . Or make some brownie points, and take your wife out for dinner!! LOL

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[C96]

I totally agree GYPSY400.

This one has been beat to death

I’m going to skip it as well and try for some double brownie points….take the wife to dinner……then…..**** real HARD!

 

[gamitch11]

Help wiring compressor motor (CENTURY B384)

I'm embarrassed to request help but I'll ask anyway.

I have bought a new Century B384 5hp motor for my compressor. I've removed the back plate but I do not see anywhere where to wire in the power leads. I'm replacing an Ingersoll-Rand 5hp motor. The leads attached to posts but the Century motor does not have any posts to attach the leads to.

Does anyone know where the 230v leads attach to the Century B384 motor?
Is the attachment points under the end plate or somewhere else?

Thanks everyone,
gamitch11

 

[gamitch11]

This post looks like it has been finished. I'll start a new thread for my request.
Thanks again.

 

[CNGsaves]

^ ^ Good idea to start new thread GAMitch11 as this gemstone has gone 7 pages!! You really do NOT want to be at end of this one !

Let's put some clarity at least and get the table from CoopVA that was going to work up with HP / FLC / wire size / breaker size, etc.

Calling CoopVA . . . . got a rough guide table you can post ??

 

[CoopVA]

Here ya go...

http://www.engineeringtoolbox.com/elctrical-motor-full-load-current-d_1499.html

If the amperage is an odd number that doesn't make a common breaker size, use the next size up breaker. Example.. If the chart says 16amps, use a 20 amp breaker...

Wire size chart

http://www.cerrowire.com/ampacity-charts

Generally, voltage drop isn't a factor unless you are covering a distance of 125' or more. If your run is more than 125' go to the next larger wire size.


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[wyliesdiesels]

^^^+1