I take it that the cable is 3/4 core armoured (Live, Neutral, Earth & Supplimentary Earth), and the Armourings (Supplimentary Earth) will are earthed at source.
If the system has an RCD (Residual Current Device)it will be unlikey that the cable will become live if reset, it would just keep tripping (However each trip causes some degredation on an RCD, they ideally shoud be changed / tested after a “pressured” trip). If there was no RCD then it would be very dangerous to reset / re-fuse as this would only have over current protection (high circuit resistance) and potentially could kill someone (Especially if the post / gates were touched).
Either way the system needs to be repaired (Cable Joint) or replaced before doing anything else.