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20th December 2017, 12:21 AM #46SENIOR MEMBER
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If it happens again the the first thing you should do is check the "insulation resistance". I always check just after the breaker. If there is a problem then you know its either the cable or motor. Then you disconnect the motor to determine if its the motor or cable. If this is an overload protected RCD then it may trip on either over current or leakage current.
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20th December 2017 12:21 AM # ADSGoogle Adsense Advertisement
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20th December 2017, 09:13 AM #47
Hi,
RCDs are set at 30 Milli amps in 20 Milli seconds, any more than that may not be life saving. 10ma are available for use in operating rooms and higher ones up to 1 amp and longer delay for farther up the line to protect the installation and not trip the mains when a sub circuit has a trip.
FYI
RegardsHugh
Enough is enough, more than enough is too much.
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20th December 2017, 09:58 AM #48Woodworking mechanic
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The question still remains as to why it is tripping -earth leakage or overcurrent?. See NCArchers previous relevant post re switch position if the breaker handles both.
Re checking insulation resistance - not everyone has an insulation resistance tester/megaohmmeter available and it should be done by someone in the know as the test conditions and result interpretation are critical.
As the equipment in question is new, I personally would be getting someone qualified in to check to see if the problem is the circuitry, current limit of breaker etc or the machine.
JMHO
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20th December 2017, 05:05 PM #49SENIOR MEMBER
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Heres my two cents...
If everything is fine in your meter box I wouldn't rule out your equipment being the cause. If its happening even irregularly I'd get it checked out even if its for your own sanity. It may not be a big deal but when you're mighty frustrated with a project the last thing you want is a electrical problem to distract you to what is already a dangerous activity.
I had a table saw once that would trip the circuit breaker every now and then couldn't figure out why but noticed that it'll only do it when nothing else was drawing power, so my solution was to turn on everything in the shed before turning on the saw eg dust collector, lights etc. Got rid of the table saw and nothing has tripped since then. So as Lappa says if its a new saw I'd get it looked at, as electrical issues are one of those things that don't generally resolve themselves.
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2nd May 2018, 06:11 PM #50
Hi All
A little bit of an update.
So after having the saw for a while this is the story so far.
After the initial tripping of the breaker and it ‘going away’ well the issue came back. (No real surprise)
It wasn’t all the time sometimes start first shot, sometimes throw the breaker a few times before it would go.
After not getting much of a chance to get any real shed time for the early part of the year, I have been recently.
And after sort of just putting up with it I finally got an electrician out to check it out. He tested the breaker and it was ok. Checked the motor and it was ok. A bit of head scratching and a call to his boss he had a couple of suggestions. One is to put in a different breaker that he called a ‘motor rated ‘ breaker. And the other is to put in another circuit with heavier cable and a bigger breaker. (Existing wire is 2.5). He is going to get a bit of advice and get back to me.
Any feed back and suggestions welcome.
Thank you
Baz
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2nd May 2018, 11:24 PM #51Woodworking mechanic
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Link to info on different breaker ratings.
https://thegrid.rexel.com/en-us/prod...-breakers/6030
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