motor starter question

[Cord]

The nice thing about using a starter such as the one linked to is the mechanical disconnect which can be padlocked in the off position, which is more secure then turning a breaker off. Breaker lock-outs are available but I expect that very few individuals have them and even fewer use them.

That's exactly where I'm headed. The motor is on a table saw so I want to disconnect the power prior to changing the blade. I used to unplug the machine, but I'm not a big fan of this method on a fixed machine. The breaker is on a different level and quite a distance away so human nature will not have me using it. I figured a machine mounted manual disconnect would be a good way to put some additional convenient safety into the saw.

In the end it was for not. The starter I linked to was 26" long and the table saw only has 23" of clear space so it doesn't fit. If I want to do this, I'll have to go with a separate starter and disconnect. I suppose I could wall mount the disconnect, but for the moment I'm sharing a single outlet between several machines until I get the shop formally laid out. Typically, table saws are installed in the center of the space and not against a wall, so in the final set up, it still won't be near a wall outlet or wall mounted disconnect. This will be the only machine with a mounted disconnect, but I'm thinking this is the way I want to go.

Regarding the use of a 3 phase starter... Many of these used starters are 3ph because they're coming from an industrial application. No reason why you can't use a 3ph starter for a single phase application. You just need to provide a jumper between L3 and T2 so the overload works correctly.

For those of you who would rather call an electrician (or plumber, carpenter, mechanic, etc) than try to figure out how to do something, the more power to you.

 

[mbohuntr]

You seem determined to DIY.. your posts clearly demonstrate you do not understand what your looking at.. at least go on some electrical forums and ask for advice.. I want no part of this..

Good luck..

 

[MossRoad]

Why not just put a locking power switch in the saw? Pretty much all table saws have those.

Six bucks at Home Depot....

https://www.homedepot.com/p/POWERTE...BEgIMGfD_BwE&dclid=CM6ehNWFvdwCFQm_wAodo3ACbA

 

[MossRoad]

That's exactly where I'm headed. The motor is on a table saw so I want to disconnect the power prior to changing the blade. I used to unplug the machine, but I'm not a big fan of this method on a fixed machine. The breaker is on a different level and quite a distance away so human nature will not have me using it. I figured a machine mounted manual disconnect would be a good way to put some additional convenient safety into the saw.

In the end it was for not. The starter I linked to was 26" long and the table saw only has 23" of clear space so it doesn't fit. If I want to do this, I'll have to go with a separate starter and disconnect. I suppose I could wall mount the disconnect, but for the moment I'm sharing a single outlet between several machines until I get the shop formally laid out. Typically, table saws are installed in the center of the space and not against a wall, so in the final set up, it still won't be near a wall outlet or wall mounted disconnect. This will be the only machine with a mounted disconnect, but I'm thinking this is the way I want to go.

Regarding the use of a 3 phase starter... Many of these used starters are 3ph because they're coming from an industrial application. No reason why you can't use a 3ph starter for a single phase application. You just need to provide a jumper between L3 and T2 so the overload works correctly.

For those of you who would rather call an electrician (or plumber, carpenter, mechanic, etc) than try to figure out how to do something, the more power to you.

And there's the confusion... in your first post you said you'd NEED a 3 phase starter(you don't). In this post you say you can re-use a 3 phase starter if you wire it correctly. That's two whole different meanings, and is probably why people think you don't know what you're doing.

Anyhow, I think you're going overkill. Just put that locking switch on it and then figure out your starter needs.

 

[Stimw]

You can buy inexpensive AC disconnects with lockout that you could mount on the wall where the unit is connected.
I have a cheap HF non-contact circuit tester that I use on wiring to be sure!

 

[CobyRupert]

The motor is on a table saw so I want to disconnect the power prior to changing the blade. I used to unplug the machine, but I'm not a big fan of this method on a fixed machine. The breaker is on a different level and quite a distance away so human nature will not have me using it. I figured a machine mounted manual disconnect would be a good way to put some additional convenient safety into the saw.

A "starter" is a contactor with motor overload protection (i.e. "heaters").
A "combination starter" is a starter with disconnection means (this can be a fused or non-fused disconnect switch or a circuit breaker).

I understand, from the above, your desire to have a local disconnect switch (lockable), but why do you need a starter?
Doesn't the saw have it's own switch?
Or does it just start when you plug it in?

Not sure of your background, so don't be insulted, but you use a starter (contactor) to stop and start a motor (typically when the voltage or amps are too large to directly switch, or you want the switch to be at a remote location etc..). Starter contactors aren't used to electrically isolate (i.e. lock out ) the motor from it's power source when doing maintenance or changing blades.

 

[MossRoad]

A "starter" is a contactor with motor overload protection (i.e. "heaters").
A "combination starter" is a starter with disconnection means (this can be a fused or non-fused disconnect switch or a circuit breaker).

I understand, from the above, your desire to have a local disconnect switch (lockable), but why do you need a starter?
Doesn't the saw have it's own switch?
Or does it just start when you plug it in?

Not sure of your background, so don't be insulted, but you use a starter (contactor) to stop and start a motor (typically when the voltage or amps are too large to directly switch, or you want the switch to be at a remote location etc..). Starter contactors aren't used to electrically isolate (i.e. lock out ) the motor from it's power source when doing maintenance or changing blades.

The starter "box" he linked to in his first post had a lockable disconnect lever on the side.