Greg:
A utility meter surface mounted to the structure could also be a 'bonding' point; neutral bonded to meter pan, meter pan screwed to/thru al. siding?
Should we not consider that the service entrance conductors are the largest conductor/circuit that may energize the siding?
With 2008, 250.94, another optional bonding point? Depending upon the mfg of the 250.94 termination device, IF it's screwed to.thru the siding?
As to getting a 'two thread' tap for a lug, I really don't see that happening. WE have bonded al. downspouts, installing lugs (rivited).
