All Replies on Help Rockwell Unisaw 3 hp Single Phase Hookup

  • Advertise with us
View DangerDoug's profile

Help Rockwell Unisaw 3 hp Single Phase Hookup

by DangerDoug
posted 07-13-2017 09:57 AM

12 replies so far

View toolie's profile


2186 posts in 3428 days

#1 posted 07-13-2017 12:52 PM

Should be no problem at all.

-- there's a solution to every just have to be willing to find it.

View GR8HUNTER's profile


7643 posts in 1512 days

#2 posted 07-13-2017 01:44 PM

if I were you I would run a separate sub panel to the shop :<))

-- Tony---- Reinholds,Pa.------ REMEMBER TO ALWAYS HAVE FUN

View Carloz's profile


1147 posts in 1391 days

#3 posted 07-13-2017 03:07 PM

And then in a couple of years you will want a plasma cutter/welder/etc then what ? Redo the whole job ? Wire is cheap, running it expensive. So why limit yourself to 20A ?

View jonah's profile


2123 posts in 4098 days

#4 posted 07-13-2017 03:29 PM

A 60A subpanel would do the job nicely. The wire will be a lot more of a pain to run yourself (you’ll need 6ga I think), but it’ll be easier to run future circuits from a subpanel.

View DangerDoug's profile


88 posts in 2446 days

#5 posted 07-14-2017 07:54 AM

Thanks folks,
The 20amp run is probably not the best idea, but can use it for temporary power.
Sub panel, that’s a thought, but there’s 12 openings in the existing CH box, including the panel box outlet.
One thought was to run #10 around the shop for outlets at the 220 machines, all on one run/circuit.
Except the compressor, that would need to be dedicated.
I’ll need a dozen or more 120 outlets for the smaller tools and the vac system(s); could use 12/3, for quad/double outlets and use both sides of the panel for extra power.

*Vac system is a collection of Home Depot Shop Vacs. They sell a full size vacuums (12 gal) for $45 around the holidays; e.g. using two at the table saw, they work nicely and run quietly.

View hairy's profile


3083 posts in 4331 days

#6 posted 07-14-2017 11:58 AM

All 220 machines on 1 circuit is a bad idea, they need to be on a separate circuit.

It’s nice to have a lot of circuits, but how many tools will be running at 1 time? You may not need as many as you think.

In my basement shop I have one 220v circuit. My tablesaw, lathe and RAS are located so that they can share that 1 socket.

-- Genghis Khan and his brother Don, couldn't keep on keeping on...

View DangerDoug's profile


88 posts in 2446 days

#7 posted 07-15-2017 08:44 AM

Thanks Harry,

FYI guys, these are hard to find and expensive but fast/easy to install.
They can be installed using the 2 circuit option.

Hubble 4 Plex:
[can be found on Amazon]

View TheFridge's profile


10859 posts in 2285 days

#8 posted 07-15-2017 03:47 PM

If the FLA of the motor is 16.1 to 24, it should be on a 30A ckt.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View WhyMe's profile


1290 posts in 2360 days

#9 posted 07-15-2017 07:21 PM

Don’t know where you live, but here in Virginia general use multi-outlet circuits are limited to 20A. Anything 30A and up needs a dedicated circuit. If you do a multiwire branch circuit (MWBC) it needs to be on a double pole breaker or two single pole breakers with a handle tie. Personally I don’t suggest a MWBC because it creates problems because of the requirement of GFCI 120V outlets in a garage. You can use a double pole GFI breaker but they are expensive.

View DangerDoug's profile


88 posts in 2446 days

#10 posted 07-19-2017 08:53 AM

Thanks for the messages.
Honesty hand’t thought about GFI’s, and that probably is code (there’s already one in a receptacle box next to elec panel). Throwing in the towel though and calling an electrician, I know a fellow that just retired a couple months ago, he’ll get up up and running (as long as the cost is reasonable).

View DangerDoug's profile


88 posts in 2446 days

#11 posted 07-19-2017 09:29 AM

Here’s a question about mounting the boxes. The shop is in a 1,300sf basement, walls have typ hanging insulation and don’k think I want to build 2” x 3” walls all around. So what about mounting boxes right on the insulation, one or two bolts right into the concrete? (the insulation contractors don’t give this a second thought).
I could pipe between boxes for the wires, maybe at 52” high, the conduit will help push the insulation tight to the wall.

View DangerDoug's profile


88 posts in 2446 days

#12 posted 06-25-2018 08:41 AM

I did find out a few things, and the 12/2 extension cord did work ok—not that I was cutting 3” lumber on the Unisaw.
With only 7 – 8 “spares” left in the breaker panel my best bet was to double-up on the 220v machines, and replace machine(s) 6’ power cords with much longer power leads and get 2 for 1 per slot (in the power panel).
This is pretty easy do with heavy-duty receptacles:

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics