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What size cord?

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Forum topic by D_Allen posted 1039 days ago 634 views 0 times favorited 5 replies Add to Favorites Watch
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D_Allen

495 posts in 1415 days


1039 days ago

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 running....www.woodandwrite.com


5 replies so far

View Minorhero's profile

Minorhero

199 posts in 1236 days


#1 posted 1039 days ago

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

danr

150 posts in 1816 days


#2 posted 1039 days ago

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

D_Allen

495 posts in 1415 days


#3 posted 1038 days ago

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 running....www.woodandwrite.com

View Grandpa's profile

Grandpa

3093 posts in 1306 days


#4 posted 1038 days ago

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

HorizontalMike

6925 posts in 1545 days


#5 posted 1038 days ago

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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