my uncles is doing an addition to a rental and wants me to add another meter main to the existing service. i have yet to see the panel in person yet. can i add a double lug to the existing panel, so i can tap off the line side for the new panel that im adding?? i was trying to look for a 3gang horizontal meter main but couldnt find one online that would probably fit.
the pen markings in the pic is what i plan to do to make the new panel fit if i cant find a 3gang meter main