self contained portable spa bonding

[jc&sons]

if i install a spa on a concrete deck is this spa required to be bonded to steel? this spa is a 50 amp 2pole with gfci protection 4 wire. can someone tell me if tthis is correct.

 

[jumper]

I believe so, 2008 :

680.42 Outdoor Installations. A spa or hot tub installed
outdoors shall comply with the provisions of Parts I and II
of this article, except as permitted in 680.42(A) and (B),
that would otherwise apply to pools installed outdoors.

(B) Bonding. Bonding by metal-to-metal mounting on a
common frame or base shall be permitted. The metal bands
or hoops used to secure wooden staves shall not be required
to be bonded as required in 680.26.


However, there is a proposed TIA for portable, self contained units for 2011:

http://www.nfpa.org/Assets/files/AboutTheCodes/70/ProposedTIA1005NFPA70.pdf