Thread: Table Saw keeps tripping the breaker

That sounds like a short somewhere.

If it's a "too high a starting current" issue remove the belt and see if it starts.

Also are you sure that that there nothing else running on the same circuit?
Ideally 15A GPOs should be on its own circuit i.e. no other GPOS on that circuit.

I would immediately get in touch with the supplier re warranty claim for a faulty motor.

I presume that you have properly unpacked the saw and ensured that the blade turns freely by hand?

Hi Baz.

You have a SERIOUS electrical problem .... there is a short somewhere .... maybe the saw motor.... maybe in the saw wiring ... or the building wiring.

You could test the 15amp circuit on a known piece of equipment ... if it works OK then it is the saw ...

You did remove the red bracket ... ?

Regards

Rob

I presume that you have properly unpacked the saw and ensured that the blade turns freely by hand?

Yep moves freely. Saw setup correctly.

I will try starting with out belt tomorrow arvo and see what happens.

Thanks for the suggestion Bob and David

Yep red bracket removed.

I tried the circuit with the DC7 Dusty and no issues.

Hope I can get sorted it by the xmas break.

Hi I had a saw that would throw the breaker, had everything tested on the saw and circuit no issues. Electrician suggested replacing the breaker with a new one and theproblem went away. It would work fine with the band saw and dust collector etc but the saw would trip it.

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The cause of the tripping is the fact that on start up the saw draws way more than its rated current. To accommodate this the breaker is designed to pass this current for a short time. How much extra current and for how long varies with the breaker's design curve. If you have a breaker that is designed for normal domestic use it will not handle a large excessive current. To find out how much current your breaker is designed to handle you need to know what its design curve is.

An example of the various curve ratings for Schneider breakers is

"Applies to the ac rated C60 Multi-9 devices
B curve: 3.2 - 4.8 times amp rating for UL489 and UL1077 (3 - 5 times amp rating for IEC)
C curve: 7 - 10 times amp rating
D curve: 10 - 14 times amp rating
K curve: 10 - 14 times amp rating
Z curve: 2.4 to 3.6 times amp rating"

You can fix your problem by having the sparky replace the breaker with one that has a more appropriate curve.

The breaker is a Hager ADC320T C20.

I really hope it is as simple as a different breaker.

If it is a warranty issue hopefully it is straight forward process.


I have a 12" Woodman combo thicknesser due to arrive before xmas too and am looking forward to getting a project or two underway.


Thank you for your replies.

Originally Posted by basil55

The breaker is a Hager ADC320T C20.

That is a C curve breaker. It looks like a D curve might solve your problem.

Originally Posted by code4pay

Hi I had a saw that would throw the breaker, had everything tested on the saw and circuit no issues. Electrician suggested replacing the breaker with a new one and theproblem went away. It would work fine with the band saw and dust collector etc but the saw would trip it.

Similarly, we had a situation in a new house we moved into - one of the power circuits in the house would trip once in a while for no discernible reason every few days. Sparky changed the breaker over, and it has never happened since - there was absolutely no change in any electrical item or habit in usage between the times.

Hopeing it turns out to be this simple!

Update.

I have just spoken to the bloke form the shop I brought
it from and he said this is a fairly common thing.
He said the circuit breakers are very sensitive and something about
earth leakage in the bigger electrical motors.
It could be a very small amount of moisture in the motor ( quiet humid at the moment)
I did get a little lost with the explanation.

So aside from that I have organised my electrician to check it out. Hopefully this arvo
or if he can’t get here today it will be Monday.

Machine supplier suggested bypassing the breaker
and seeing if it starts. I’m not sure about that one.

If sparky not here until Monday I will take belt off to see if that allows it to start up.
Other than that I will just have to wait and see for now.

Thanks

Baz

If it trips the RCD then it is earth leakage. If it is the breaker then it is the over current. (There are RCD breaker combos which does not help but these are rare).

Most likely over current as Bohdan said, the electrician can sort it out pretty easily

Didnt know about curves on breakers. Good to know.

Shame the breakers don't have a small display to show a small diagnostic code.