@im.ovr0: Armored Ground Wire! Have you used it? usually 4 or 6 is used to ground your panel upgrade. 4 is 4-1 but its actually 4 stranded. Others call this MC or AC or BX but its just a way to describe this type. Other options are Bared Copper Wire. Next video 📹 #foryoupage #electrician #pov #para #fyp