Table saws #1: Issue with 220 volt saw

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Blog entry by John posted 04-24-2017 01:32 AM 809 reads 0 times favorited 5 comments Add to Favorites Watch
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I have a Delta Contractors saw and had an electrician change the motor wiring from 120v to 240 volt. My shop had a dedicated 240 receptacle that read 240 volts with a meter. When I plugged it in to run, it started up even with the with on off. It is running about half speed would be my guess. the only way to shut it of is unplug it or shut the breaker off, NOT GOOD. I’m wondering if the saw was wired 120 and thats why its running at about half speed. I’m thinking that maybe if I put a 120v plug it could correct the problem. I’m also considering have the electrician who wired the motor to come out and look at it. Has anyone ever run into this type of problem before. The wall receptacle was done by an electrician, and the motor was done by another electrical company. I didn’t use the man who helped me wire the workshop because he passed away two years ago. So any help would be greatly appreciated.


5 comments so far

View WhoMe's profile


1568 posts in 3847 days

#1 posted 04-24-2017 01:57 AM

Simple trouble shooting will narrow it down but, if you are plugging in the saw and the motor starts running with the power switch off, IMO, that is a motor wiring problem.
Get a digital volt meter and measure at the plug. A hot to the common should be 120v, the other hot to common should measure the same 120v. Measuring across the hots will get you 240v or so. If all these measure good, it is definitely a motor wiring problem.

-- I'm not clumsy.. It's just the floor hates me, the tables and chairs are bullies, the wall gets in the way AAANNNDDD table saws BITE my fingers!!!.. - Mike -

View cabmaker's profile


1745 posts in 3413 days

#2 posted 04-24-2017 09:40 AM

single or two pole switch ?

View EricTwice's profile


248 posts in 1137 days

#3 posted 04-24-2017 10:41 AM

Sounds like it is in the switch. (You seen to be getting 50% power 100% of the time) plug it in and turn the switch on and see if it goes up to speed. If it goes to full speed it is in the switch. If it doesn’t it still has a switch problem.

Do not try to use it with this problem. You will burn out the motor. Get your electrician friend back over and have him fix it.

-- nice recovery, They should pay extra for that mistake, Eric E.

View Dwain's profile


602 posts in 4463 days

#4 posted 04-26-2017 08:51 PM

How about you get your electrician friend back over right now and don’t worry about checking anything out. Something is wrong, it is dangerous, call the pro, right now.

-- When you earnestly believe you can compensate for a lack of skill by doubling your efforts, there is no end to what you CAN'T do

View John's profile


8 posts in 1052 days

#5 posted 04-29-2017 02:10 AM

I had an electrician over for the saw, as I thought the switch is for 120V only, so we set it up for 120, wiring the saw as such. Tired worked fine cut some hard maple like a hot knife through butter. Using a new Forrest blade and really like what it does. Thanks guys for all the input. Now going to put the Biesemeyer fence on tomorrow.

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