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Is the pool/spa pump exterior grounding required to be connected to something?

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I'm having trouble finding the answer to this...


Pool/spa pumps are powered via an electrical cord that enters the pump through a rear cover to a terminal board, where the hot, neutral, and ground wire are connected (sometimes a fourth wire for 2-speed pumps).  


So far, so good. 


However, both my current AND previous pump had a grounding terminal on the exterior housing of the electrical motor and I am wondering: 


1. Is it necessary to connect a wire to this terminal?


2. If so, how do I determine the gauge of the wire that should be used? I believe the pump can draw 9.4 amps, max. Would this be 14-gauge or thicker?


3. Where would the other end of this wire connect to?


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