Unisaw wiring 220v 50 amp too much?

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Forum topic by waltmoe posted 09-30-2012 08:45 PM 1832 views 0 times favorited 7 replies Add to Favorites Watch
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1 post in 2034 days

09-30-2012 08:45 PM

I just purchase a used Delta Unisaw, perfect condition. I am new to wood working and am staring to install some other wood working equipment.

I have a 220v 50 amp circuit in my garage for a Mig welder. Is 50 amps too much to use for for the Unisaw? I just want to avoid pulling another 220 amp circuit just for this saw..

Thanks for your assistance.

7 replies so far

View Don W's profile (online now)

Don W

18686 posts in 2537 days

#1 posted 09-30-2012 08:51 PM

a 50 amp circuit just means thats how much juice you can draw before the breaker trips. A 30 amp saw will still only (well should only, unless something is wrong) draw 30 amps. Personally I’d use the circuit. The other thing you can do is just switch the breaker. (of course the welder will then probably trip the breaker)

-- - Collecting is an investment in the past, and the future.

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2120 posts in 2598 days

#2 posted 09-30-2012 09:01 PM

+1. does the unisaw have a magnetic starter switch?

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

View Loren's profile (online now)


10283 posts in 3617 days

#3 posted 09-30-2012 09:12 PM

If the saw already has overload protection on the motor or
in a magnetic starter, it should be fine. A Unisaw
wired for single phase is unlikely not to have overload

View jmos's profile


823 posts in 2339 days

#4 posted 09-30-2012 09:12 PM

Use the circuit. The breaker is there to protect the wiring, not the motor; you run light bulbs on 15 amp circuits and they don’t draw anything close to 15 amps. You could replace the 50amp breaker with a lower amperage breaker, that more closely matches the motor, if you like, the wiring will just be over sized. The bad situation is having too large a breaker for what the wiring can handle.

-- John

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1652 posts in 2909 days

#5 posted 10-01-2012 02:48 AM

+1 use it.

-- Sorry the reply is so long. I didn't have time to write a short reply.

View crank49's profile


4030 posts in 2940 days

#6 posted 10-01-2012 05:42 AM

It will be fine.
For all the reasons already mentioned.
Plus, a motor pulls several times its rated running amps to get started.
For example, If running amps is 12 the initial surge might be 50 amps, but for less than a second.

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Rob Drown

787 posts in 3802 days

#7 posted 10-01-2012 05:58 AM

Everything said is correct. If you keep the 50 amp breaker, then any additional wire added to that circuit should be rated for 50 amps, not the rating of the motor.

-- The expectations of life depend upon diligence; the mechanic that would perfect his work must first sharpen his tools. Confucius, 经过艰苦的努力的梦想可以成真

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