The grey power cable to my shower has been exposed under a floorboard.?

theres a red wire, black and yellow. i turned the power supply to the shower off at the main switch board. but when cutting through the cables to repair it it nocked off another switch on the switch board even though the shower is on its own circuit. does this mean there is still power in the wires and is there any... show more theres a red wire, black and yellow. i turned the power supply to the shower off at the main switch board. but when cutting through the cables to repair it it nocked off another switch on the switch board even though the shower is on its own circuit. does this mean there is still power in the wires and is there any power in the yellow wire (earth). witch is the live wire red or black?
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