[dsymonds]

One big reason for shutdown rules with home PV systems is to keep firefighters safe. If your house is on fire, the firefighters really don't want to be contending with high voltage electricity as well.

[gsich]

Problem is that, as long the sun shines, a voltage will be generated. Depending on how they are linked together this makes it more or less dangerous.

[TheAdamist]

I've been noticing ground level external emergency shutoff switches for roof based solar around my city, so i imagine its something thats been making its way into fire/electrical/building codes recently.

They're unsecured as far as i have noticed, so i imagine the troublemakers will be pulling them sooner or later.