Author Topic: Electrical question  (Read 2385 times)

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Offline pilotboat

  • Posts: 7
Electrical question
« on: December 30, 2016, 12:46 PM »
The Kapex 120 draws 13 amps.  The CT 26 draws 10 ( at max).  The total is 23 amps.  What size circuit is everyone using with their Festools?

I currently run my CT 26 and TSC 55 on a 15 Amp circuit without a problem.  I did measure the draw on the circuit.  It initially went as high as 22 amps then settled at around 15.  The breaker did not pop.


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Offline kevinculle

  • Posts: 192
Re: Electrical question
« Reply #1 on: December 30, 2016, 03:23 PM »
Motor starting amperage draw is much higher (like 2x) than the running draw.  The CT motor start is typically delayed a bit when the Kapex is plugged in so the peak draws will not occur at the same time.  In my shop I run the Kapex off a 20A circuit and use a separately supplied dust collector so it is a non-issue.  In the field I run the Kapex & CT-26 combo off a 20A circuit if one is available but I have also run them off 15A when that is the only choice without any issues.

If you look up circuit breaker characteristics you will learn that there is a strong time dependence between the current required to trip the breaker and the duration of that current.  A breaker will not trip at about 10x its rating for a few cycles (1/10th of a second) and will carry 2x to 3x its rating for 10 or more seconds.  Only out at about 500 seconds will a breaker trip near its rated current.  From all of this I would assume that Festool's stated current draws are maximums and that the combined running draw of a Kapex and CT-26 are well below 15A.

Offline Gwerner

  • Posts: 239
  • They call me George...
Re: Electrical question
« Reply #2 on: December 30, 2016, 04:17 PM »
In my shop I have the Kapex plugged into my CT Midi which is running off of a 20A circuit. Have never had a breaker trip.

Offline ear3

  • Posts: 3545
Re: Electrical question
« Reply #3 on: December 31, 2016, 09:51 AM »
When I run the CT26 and Kapex on a 15 Amp circuit, the Kapex does not get up to full speed, so I have stopped doing it.  I don't recall ever tripping the breaker with that setup, but I have when running my CT26 and TS75 on that circuit.
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Offline BJM9818

  • Posts: 202
Re: Electrical question
« Reply #4 on: January 05, 2017, 06:10 AM »
I have had issues running my midi/Kapex off a 15A circuit with an ARC fault breaker.  I am also seeing failure rates in excess of 10% for brand new out of the box ARC fault breakers so I'm pretty sure they are related.