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Tony Hwang

wrote:
On Nov 27, 2:15 am, "Kevin" wrote:
I just finished wiring in two 220V circuits to the shop -- 1 for the dust
collector (5.5A), and the other for the tablesaw (14.5A), jointer (6.5A),
and tbd.

Just for grins I put all of them onto the one circuit. So 5.5+14.5+6.5 =
26.5A. The 20A breaker did not trip. I even tried starting up the tablesaw
while the others were running.

Now in practice, I will keep my dust collector (5.5A, 1.5HP) on it's own
circuit, but apparently I could concurrently run both the tablesaw (14.5A)
and the jointer (6.5A) and possibly even a 3rd TBD on that other circuit.
How is that? The real load must be under 20A, or the 20A breaker allows
more like 28A.

I first tried the TS and Jointer, and when they did not trip the breaker
(total 21A), I added the DC. I was surprised all three did not trip the
breaker. But I guess each was running with no load, so that is surely
another reason.

Curious,

Those ratings are for machines with a maximum work load. In other
words, a saw just spinning doesn't pull as many amps as one ripping a
big piece of wood. If you put them to work instead of just spinning
them up, your results would be different.
Hi,
And motor starting surge current is for split second more than that.
Quite unlikelt all 3 devices will be active simutaneously. Also circuit
breaker has several different typr. One will trip instantly when
overloaded. One will have a delay to trip and one which is temperature
compensated, etc.