New Code Requirements

[Colt45]

I suggest it should apply to ground and roof as well.

A roof without a building?
It was "on a residence" now it is "on a building" so almost all structures other that pole mounted.

I was talking with my local AHJ and they have no clue what they are looking at. Since this year is the first time I am going to put PV on my roof I need to comply but, not quite sure how. My systems are set up to NOT turn off. I have a 12kVA UPS, Xantrex XW inverter with battery and automatic generator. I can turn off the PV but that will not kill my house. The problem is where do the PV conductors stop....
In my case a "rapid shutdown" is somewhat misleading to first responders and the older labeling for alternate power source makes more seance. (You should see the warning labels! LOL)

[Solarisolator NZ]

Keeping people safe is a good thing and I support it.

What concerns me is what will the new regulation do to the cost of a system. And will existing systems be required to make hardware changes to meet the new regulation or will there be a grandfather clause?

I'm not sure what the costs will be in the US see (http://www.firesafesolar.com) for the US Agent. Here in New Zealand the costs range from approx $NZ435 for a 6 panel RSI or $480 for a 10 panel RSI. E.g., for a 3.0 KW solution with 12 panels you would need 2 x 6 panel RSIs so costs are approx $870 for a new or retro install. If the costs are taken over the whole solution its not a lot considering it enables Rapid Shutdown Isolation and peace of mind.

[Colt45]

A DC contactor can also be used and should costs a lot less! (but not easy to find)
Just don't forget "Equipment that performs the rapid shutdown shall be listed and identified."