Had a weird voltage drop on a long run for a keypad last week
I was putting in a new system at a big house in the hills, and the main panel was in the garage. The owner wanted a keypad by the front door, which was a good 150 feet away through finished walls. I figured I'd just use a standard 4-conductor cable, no big deal. When I got it all hooked up, the keypad screen was dim and the buttons were slow to respond. My meter showed the voltage at the keypad was only 8 volts, down from the 12 at the panel. I learned the hard way that on long runs like that, the wire gauge matters a lot more than I thought. I had to go back and pull a heavier 18/4 cable to fix the voltage drop. Has anyone else run into this on a big property, and what's your go-to wire for these long keypad pulls?