Earlier this year, solar PV fire... Tripped out the main ryefield fuses back at the origin of supply. Looked into it, solar ac supply was just wired directly into the tails by the meter. Lucky the 90min fire protection of the riser worked!
The client was shouting asking for the building to be re-energised and I refused until further investigation. Took a while to find this mess and came back next day to fault find fully. If anyone had put fuses back in, the solar PV would be straight back into fault.