What size cord?

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Forum topic by D_Allen posted 10-23-2011 04:37 AM 791 views 0 times favorited 5 replies Add to Favorites Watch
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495 posts in 1876 days

10-23-2011 04:37 AM

I want to replace the cord on an old sears motor that runs my jointer.
It is a 1/2 HP 1750 RPM and is rated at 6.7 amps.
I see that my 3/4HP lathe motor and the 1/3 HP DP motor both use 18-3.
The TS has a 14-3 but I’m not sure what HP, it is a BT3100.
So, I am thinking that at least a 14-3 cord. #18 seems too small.
I was thinking of getting a 14-3 heavy duty short extension cord and cutting off the end.

What say you guys?

-- Website is finally up and

5 replies so far

View Minorhero's profile


360 posts in 1697 days

#1 posted 10-23-2011 04:48 AM

Whenever re-making old machines I pretty much always replace the cords. I always use extension cords of either 14-3 or in the case of motors of 2hp or more 12-3.

View danr's profile


154 posts in 2277 days

#2 posted 10-23-2011 04:57 AM

14 gauge will be fine for the motor you describe.

Note that I am not a licensed electician (just had to say that).

I have done a lot of residential wiring (for myself) over the years and I have found that most local electicians are extremely helpful if you call them up with a question.

A cold 6-pack can also help in this regard.

View D_Allen's profile


495 posts in 1876 days

#3 posted 10-23-2011 08:37 PM

I actually found that the local blue box had replacement cords for this purpose. No need to throw away the molded end. 14/3 SJTW 10 ft long.

-- Website is finally up and

View Grandpa's profile


3246 posts in 1768 days

#4 posted 10-24-2011 02:46 AM

I bought replacement cords with the plug molded on then found that if I watched for a sale I could buy the drop cords cheaper. I generally use 14 ga since it will carry about 15 amps in copper. Larger if you need more amps.

View HorizontalMike's profile


6981 posts in 2006 days

#5 posted 10-24-2011 03:57 AM

I believe that the premise is to have the power cord _”smaller”- than the 12-3 or 10-3 that is in your walls. This is because the power cord will burn up BEFORE the wiring in your wall.

That being said, I have been known to violate that premise when I put LONG power cords on equipment like my BS, TS, Jointer, etc. in order to give me greater portability in placement in the shop.

-- HorizontalMike -- "Woodpeckers understand..."

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