| OK all I can explain is the National Electric Code, which usually is adopted by all states and local code enforcement officals. They do have the authority to modify or amend the NEC to suit their reaosns, but usually do not change much.
What is required is to BOND (not ground) all metal piping, metal parts of electrical equipment, and pump motors together with a minimum of #8 solid copper wire. This can be done all at or under the tub.
Run a #8 soild copper wire and connect to each metal pipe that may be under the tub, the control or junction box, and the pump motor. The pump motor usually has a lug on the outside of the motor for this purpose. Pipe clamps rated to clamp on a metal pipe, these also provide the wire lug, one on each hot and cold water pipes, and the junction box, again should have a lug for this.
All of this usually can be done with a six to ten foot piece of , again, #8 copper solid wire, under the tub. This wire does not need to go back to the panel, or anywhere for that matter, it just stays under the tub.
Once the wire connects to the motor, this bonding wire gets grounded thru the equipment grounding conductor that is in the cord and branch circuit cable that feeds the motor.
If the local inspector requires you to run the grounding wire back to the panel, he does not understand the NEC 2002 editon Section 680.74, or whcih ever code edition is in effect where you live. Ask him to review this and see if you can get him to change his mind.
There is no requirement, and is not allowed, for any separate ground wire to be run from any electrical equipment in a building back to a panel or grounding system. This is all done with the equipment grounding conductor, for example, the bare wire in Romex, which must be run to every device. All equipment grounding conductors must be included with the feeder wires in a cable or raceway. | 
on the hot water pipe? 
Linear Mode
