Hi,
I am installing a swimming pool which requires a separate 20 amp circuit to run the pump, pool light and future heat pump. The pool pump is rated at 7.4 amps, runs on single phase 240 volts and is 50Hz. The cable run from the meter box to the pump/pool equipment is 41-45 metres.
How do I find out what size cable to use e.g. 2.5mm etc, and do I need to run a separate earth or can I use the earth in a twin and earth flat cable?