If you are wanting to do it yourself, you might want to check your local library and see if they have a current copy of the National Electric Code (NEC).

Wiring for a pool is a bit different that wiring for your lights and outlets.

I have worked for electrical contractors, and have done residential, commercial, and industrial installations. Each has a specific set of rules, as does pool wiring installation. Better to be safe, than have to explain how and why someone got shocked or electrocuted while using your pool.

GFCI and AFI (ground fault circuit interupter and arc fault interupter) both have been known to fail on rather than fail off. Meaning your circuit is no longer protected, and is live all the time.

Charlie