in general... in US and I see in Canada..... L is for live or line..........(ps... don't kill yourself, or your dog)
.
.
Quick Answer: What Does N and L Mean in Wiring?
L (Line / Live / Hot): The conductor that carries voltage from the power source to your device. It can cause electric shock if touched.
N (Neutral): The return path that completes the circuit back to the source. In the U.S., neutral is bonded to ground at the main service but must be kept isolated from ground on branch circuits and subpanels.