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[Shop-talk] 50A vs. 30A

Subject: [Shop-talk] 50A vs. 30A
From: markmiller at threeboysfarm.com (Mark Miller)
Date: Wed, 30 Mar 2011 19:13:29 -0700
<<<I recently purchased a 220v band saw for my shop that has a 30 amp plug.
My shop has plenty of 220v outlets, but they are all wired to 50 amp
plugs and protected by 50 amp breakers.  The 50 amp circuits were set up
for a welder.

I don't want to add new 30 amp plugs and breakers all over the shop.  I
would prefer to have something that would plug into the existing 50 amp
sockets and terminate in a 30 amp receptacle for the saw.  I also want
to have a 30 amp breaker in the line that protects the saw.  In other
words, a 30 amp plug and circuit breaker down line from the 50 amp plug
and breaker.

What's the best way to do this while protecting the saw with a 30 amp
breaker in the line?
>>>

The simple way to do this t\is to get a 50A plug and put it on the end of
the saw and plug it in.  The breaker protects the in wall wiring, the saw is
supposed to protect itself, and run fine on any outlet providing 30A or
more.  

Think of plugging a lamp with a 100W bulb into a 15A wall outlet: it only
draws about 1 amp and is fine.  Same with your saw (but way more fun to
have).

Mark Miller

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