[Shop-talk] 220V extension cord with breaker

[Peter J. Thomas]

On 3/30/2011 5:02 PM, Gil Fuqua wrote:
> 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?

Circuit breakers are there to protect the wiring in the wall from the 
load, not the other way around.  There is no reason for the additional 
circuit breaker.

Peter Thomas
> Gil
> Nashville
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