wire breaker requirements for equipt.

[mdshore348]

i was wondering if someone with electrical experience can help me with the requirements for wire size , breaker size for my various equipt.

i have a 7.5 hp belaire compressor 208-230/1
bend pak 9k lift hd 9 says 220vac/60hz 1ph.
lincoln ac/dc welder stick ...230 v ?

 

[bmwpower]

You need to look for more information on each device. There should be a nameplate that states the amperage. This is what you'll need to size the circuits. Get that info and get back to us.

 

[mdshore348]

ok, but i dont have the bend pak lift yet.. does anyone have one out there?

 

[rockwithjason]

You might be able to get the specs online. Try a google search.

 

[bmwpower]

ok, but i dont have the bend pak lift yet.. does anyone have one out there?

It's probably going to be similar to a Rotary, which i have specs on, but you want to be sure. If you can't get them from the manufacturer, I'm sure someone on here can assist.

Specs for Rotary are 20A breaker, 25A wire required. Size wire for 30A (10 gauge).

 

[bdks]

Also how far from your electical panel will the items be located.

 

[mdshore348]

talked w bend pak rep, said 30a , and im sure 10ga wire is sufficient for 40 ft of run.

 

[Charles (in GA)]

i was wondering if someone with electrical experience can help me with the requirements for wire size , breaker size for my various equipt.

i have a 7.5 hp belaire compressor 208-230/1
bend pak 9k lift hd 9 says 220vac/60hz 1ph.
lincoln ac/dc welder stick ...230 v ?

The 7.5 hp compressor tells me its a true 7.5 hp RUNNING. For some reason, when you go above 7 hp (even) the bogus hp ratings go away. Every 7.5 hp compressor I've looked at was a real, honest to goodness, 7.5 running hp, not those trumped up starting hp numbers.

That said, you need to check the data plate on the motor, but you will find that a 7.5 hp motor draws 31 to 33 amps. You should never exceed 80% of an electrical components capacity in normal use, Thus, a 40 amp breaker is marginal, 32 amps is its 80% limit. I went with a 50 amp breaker on my 7.5 hp compressor, and ran #6 copper cable (THHN in a 3/4 conduit) to a subpanel about 60 ft (electrically) away from the main panel. When you are talking distance, be sure to measure all of the ups and downs and over doors and windows, and such, it adds up.

Don't know for sure about the welder, but I'll bet a 50 amp breaker will be more than sufficient, again with properly sized cables.

The very best thing you can do it go to Lowes, or HD and look at the bookshelves. They have decent how to books on electrical, but the stuff you really want is the flip book, "Code Check: Electrical" and "Ugly's Electrical References" These books are invaluable for helping anyone understand the complex NEC rules. They will help you with wire sizing and type, conduit sizing and have lots of good info on conduit and box fill limits (no of wires allowed in conduit or box of various sizes)

http://www.amazon.com/gp/product/1561585505/?tag=atomicindus08-20

http://www.amazon.com/gp/product/1561587389/?tag=atomicindus08-20

http://www.amazon.com/gp/product/1561587389/?tag=atomicindus08-20

If you really want to go whole hog, here is the softcover edition of the 2005 NEC

http://www.amazon.com/gp/product/0877656231/?tag=atomicindus08-20

Hope this helps

Charles

 

[sberry]

Yes, a 50 and number 8 wire is suffecient. To elaborate it needs a wire with 125% the ampacity of the full run load and in theory could be breakered to 100A. In reality with modern breakers a 50 wouldnt be any too much and would probably work fine, I have 1 24A motor load and running on a 30, never been a problem. If I was tripping a 50 I would probably be wondering why on the 7 1/2. You could use the same wire size for both circuits, breakers too, recepts for that matter. I think you can get 125 ft of 8 at the home stores. Yes, the 10 will be plenty for a hoist, I dont think they are over about 2 hp, I see some that spec 20A service also.

 

[mdshore348]

i checked , the compressor is a belaire 318vl which requires a 50a , and it will be about 40ft from my panel ,so i will prob use 8 /3 wire . thanks for all the replies!