I want to add a gfci and surge protector to the 240v circuit for my pool pump. The 12 guage power wires (red and black) and ground (green) run from the corner of yard directly to the main breaker panel on the house, to a thin 20 amp double pole breaker.
I would like to add a small ‘sub panel’ in the corner and was figuring I would need a 20 amp double pole gfci breaker and a 20 amp double pole breaker for the surge protector. I would assume I hook the red wire to one feed and the black to the other, the green to the ground bus, snap in the gfci and run the red and black and ground to the 240v pump.
What do I do with the white neutrals from the gfci and surge protector? I am guessing they to the ground bus since the ground runs straight back to the main panel, but I would rather be sure than BBQ something, maybe myself.
Assuming that is good, I would also like to add another single pole 20 amp breaker to the sub-panel for a 110 outlet. Can I run the neutral wire for that circuit to the ground bus in the sub panel also?
Update: 6/4/16: Thank ALL of you for your comments. I really do appreciate the great advice and am very grateful for the help. Please know that spending your time helping others makes a real difference :)
Revised plan, after your comments and reviewing Article 680 NEC:
(1) Install a 20 amp GFCI at the main breaker panel for the dedicated 240 line for the pool pump. Neutral wire from GFCI attaches to ground/neutral bus which is the same at the main.
(2) Add 240 Disconnect by pool pump.
(3) Add Intermatic PS3000 surge protector by connecting it to disconnect. Called Intermatic and they said I can just wire it at the Disconnect by connecting to the red and black 120 lines, and the surge protector neutral to the 240 ground. This seems to make sense since the 240 ground runs directly back to the main ground/neutral bus (let me if this was bad advice!)
(4) Use a separate 20 amp 110 circuit for pool light and accessories.
(5) Add a whole house surge protector at the main box (will require replacing panel since no more space).
Pool pump is about 75' from the main breaker and I have read it is better to have protection at the main panel and also at the equipment. The new pump is a Pentair variable speed which seems to high a high rate of failure due to the electronics on the pump which are apparently sensitive and the price of a new pump to replace.
(6) After doing the wiring and plumbing, I plan to have a pool professional or licensed electrician to perform the final connect and start up, which will help with warranty.
I am in Fort Lauderdale, FL if anyone has a recommendation!