Jim,
As Pierre and others have noted, ground rods for this particular installation would be considered auxiliary under the NEC and governed under Section 250.54. Said auxiliary grounding should be connected to the equipment grounding conductor as noted in Section 250.54. Said rods should NOT be connected to the grounded conductor as this would be a violation of Sections 250.6 and 250.54. (at least that is my understanding...)
Section 250.54 directs the reader exactly how to utilize auxiliary grounding, which connections are permitted and especially which connections are not required (specifically Section 250.50).
You do not say this installation is outdoors, but I am assuming that it is.
In either case:
Your review of Part IV of Article 680 (Spas and Hot Tubs), should reveal that both indoor installations (Section 680.43), and outdoor installations (Section 680.42) are subject to Parts I and II of Article 680. Meaning they are both subject to Section 680.26 (Equipotential Bonding).
Your review of Section 680.26(A) should reveal that said equipotential bonding required by this section "shall be installed to reduce voltage gradients in the pool (or in this case the spa-hot tub) area".
While ,admittedly, it is difficult to discern from Section 680.26...
Said equipotential bonding is not required for:
........... - anything separated from the pool (spa-hot tub) by a permanent barrier
........... - anything beyond 5 feet horizontally and 12 feet vertically from the inside wall of the pool (spa-hot tub)
............................... except for metal parts of electrical equipment associated with the pool water circulating system, as noted in Section 680.26(B)(6)
......................................... [said metal parts of (B)(6) require equipotential bonding regardless of location] .
While I can only envision your particular installation, you noted in your post that said installation was "14 feet above ground on wood deck".
Equipotential bonding for an installation is which is isolated on a wooden deck at 14 feet above grade and establishes a reach path greater than 5 feet from the inside wall of the pool appears mute.
While this tends to make many people quite nervous, it is certainly possible that there is actually nothing about your installation which requires any equipotential bonding...
... Yes, there are insurance companies and jurisdictions which will require perimeter bonding to be installed for said elevated wooden deck... Said perimeter bonding for an elevated, isolated wood deck has absolutely no contribution to satisfying the performance requirements outlined in Section 680.26(A) ...
Unfortunately Section 680.26 contains no language to provide any clear direction for installers or enforcement for cases such as the one noted here...
All that being said...
Ultimately this leaves you with providing any equipotential bonding deemed necessary by the AHJ... (which is certainly what I recommend you should do...)
I do hope this is helpful,
mweaver