On 17/12/2014 11:29, RobertL wrote:

Are you asserting that the grid isolator is also required to
disconnect all the series wiring between the individual panels?

Maybe the fire brigade only tackle such fires at night.

Nearly all the dc wires are external, under the panels and it is all
much better insulated than the mains. Its waterproof and if the roof is
disrupted then its easy enough to rip the wires apart with one of their
long poles leaving 40V dc if the panel is working.