Can I run a 15A table saw on a 15A circuit if there are also shop lights on the same circuit?
Your usage scenario is quite typical, and whether your 15A breaker will trip or not depends on how long you are cutting, how heavily the saw is mechanically loaded, and the magnetic &amp; thermal trip characteristics of your breaker.
Let's say you have the lights on and you are doing some heavy cutting. You are past the inrush (startup) and the motor is not stalled.
Here's a sample calculation for your nominal cutting conditions:

The motor for a dewalt 7480 is spec'ed at 1850W or 15.4A at 120V, with maximum load before stall.
Your lighting is 4 40W LED panel lights, 1.3A.
Total current 16.8A
Cutting Time 100s
From the &quot;trip curve&quot;, a &quot;Square D&quot; will definitely trip at 2x the rated current, i.e. 2x15A = 30A. And definitely not trip at 1.2x rated, i.e. 1.2 x 15A = 18A
The total is just below the &quot;definitely not&quot; trip point. Turn down your garage stereo.
Happy cutting.


Load time (seconds) vs Maximum current as a factor of the rated (e.g. 15A) current. To the left of the grey band: definitely not trip, below thermal trip. To the right of the grey band: definitely will trip, above magnetic trip.
Breaker trip chart from https://download.schneider-electric.com/files?p_enDocType=Data+Bulletin&amp;p_File_Name=0600DB0105.pdf&amp;p_Doc_Ref=0600DB0105
You can check the stall current by measuring the resistance of the motor, and calculate I = 120/R.
It's usually not listed, and likely well above the 15A rating. Your breaker will not trigger immediately if the current is briefly above 15A. A GFCI breaker may behave differently and trigger faster.
The inrush current is typically much higher than the stall current, and more likely to trip the breaker if the circuit is already heavily loaded.
Your wiring, especially any extension cords, will resistively limit the current and provide you with more cutting time, albeit at a slightly reduced voltage and thus power. For short term use this is not a practical problem not a problem, but do be watchful of any heat-up in the wire or at the socket &amp; plug. If it is too hot to touch you are approaching unsafe levels.