sub panel

[James Tibbetts]

I need to run a sub panel to supply 220v power to the work area, probably a 75 amp box. The cable run from the service will be about 30 feet. What size cable is necessary to feed the box?

Thanks,
JIm

[Dale Murray]

http://www.paigewire.com/pumpWireCalc.aspx

Put your info in there and it will spit out the answer.

[James Tibbetts]

Great link! Thanks Dale!

[Rollie Meyers]

Just a FYI, there are no 75A fuses or circuit breakers, 70A or 80A are the standard choices, a 80A breaker would most likely be special order though.

[Steve Peterson]

I wired my shop with 60A and never had any problems. Only one power tool would run at a time, but there are many always-on tools. The largest load at once would include a 5hp table saw, a 5hp ClearVue, lights, window AC, and an air filter. The table saw and DC each have 30A breakers at 220V, but probably consume closer to 15-20A after the startup surge.

Steve

[James Tibbetts]

Rollie that's good to know. I was thinking about the rating on the panel at HD, listed at 75 Amps.

Steve you're on target as to what I would run at one time. Certainly a smaller duct collector so the standard 70 that Rollie mentioned should be more than enough.
Thanks guys.

[Mike Henderson]

I ran 50 amps to my shop and never had a problem. As Steve said, you generally only have one tool plus the dust collector going at a time.

Mike

[Thomas Canfield]

You definitely need to get a conservative estimate of the power usage required including the starting amps. Don't forget your lighting load, possible heat/cooling, air compressor or other auto start equipment, dust collector, air filter, and possibility of friend using some additional equipment along with your usage. It is always better to have service oversized than run near limit, and additional breaker space is also handy.

[James Tibbetts]

Thomas the lighting and all 120v stuff are already there on seperate runs. This will be a one man/one tool at a time area for this panel with 220v circuits. A little head room is a great idea; I think I will have that on a 70 amp feed.
Thanks to all that have replied.