electrical - Black/black/black/green wires to black/red/white/green - how to figure which one to which? - Home Improvement Stack Exchange

There is a line for a hot tub that I am trying to reconnect. Hot tub side has black, red, white and green wires. Power supply side has three black and one green wires. The green was previously conn

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Electrical wiring colours, pre-2004 IEE-10062011. Red is l…