I went on line and found this. I was also in the construction business for most of my life and have seen lots of my electric tools get ruined because of running to many feet of the wrong size chord

MAXIMUM DISTANCES UP TO 10 AMPS UP TO 15 AMPS

0' to 25' 16 Gauge 14 Gauge

25' to 50' 16 Gauge 14 Gauge

50' to 75' 16 Gauge 12 Gauge

75' to 100' 16 Gauge 12 Gauge

Extension Cord Ampere Rating

Wire Size (Copper) Single Phase Two and Three Conductor Cords Three Phase Cords

16 AWG 13 amps 10 amps

14 AWG 18 amps 15 amps

12 AWG 25 amps 20 amps

10 AWG 30 amps 25 amps

8 AWG 40 amps 35 amps

6 AWG 55 amps 45 amps

4 AWG 70 amps 60 amps

2 AWG 95 amps 80 amp