So I called them today and was given a very generic answer of "it's to ensure the safety of the spa because obviously it's an electrical product and there's water involved." I asked if they could explain exactly what bonding to the terminal on the pump achieves and they could not offer any explanation. I was advised to send them an email and they may be able to find an answer. Will provide an update here if and when I get a response!
I have a Lazy Spa Hawaii and it has the same instructions. I just plugged mine in and switched on. As it is outside in all weathers it has to be suitable for this use.
I suspect the extra terminal is for use in other countries where they may not use a 3 pin plug as standard. i.e. I think USA use a 2 pin system and pretty sure Australia do not use earth as a standard feature in their systems.
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