the disco is something that needs to be within sight of the motor, as some tub motors are not intergral to the tub ( as in commercial settings) an E-stop for the serving motor is to be placed within sight of the tub. (from the hip, this might be 680.41)
isn't it interesting that , a permanent hardwired pool should not require a GFI , where most hot tubs & spas are listed for them?
must be something to do with the bonding eh?
~S~