I don't do guesswork .simple testing sorts it with the correct equipment. ive just renewed a damaged 3 phase underground cable in a school . blue phase with an earth fault on. 6 grand to disconnect it and dig a new one in . 125mm 4 core £1oo per meter
I wish I could have . only exposed 3 meters each end and the rest was left inOf course, you took the old one away to save them the trouble of disposal?