Safety at 600v [RE-wrenches]

[graham at solarexpert.com]

I am wondering if any wrenches that are installing high voltage systems 
on rooftops are also putting a “DANGER” plaque on the roof by the 
modules?  I have noticed sizable danger stickers on the Power Light 
Power Guard systems, are these notices required?

My concern is what happens in 10 years from now when a homeowner decides 
to re-roof the house.  Many roofers in L.A. have their guys remove and 
replace solar panels to avoid scheduling conflicts with solar guys.  
Roofers tend to cut every wire they see (typically sensor wires up until 
now) and pull lag bolts out with crowbars instead of un-threading them.  
I would estimate that 95% of roofing laborers in L.A. speak Spanish as 
their primary language.  I think there should be an engraved plaque on 
the roof written in English and Spanish to inform people of the danger 
potential and how to safely de-energize the system before tampering.

Due to the continuing LADWP PV lockouts I need to install in CEC 
territory.  High voltage systems with Sunny Boy’s seem to be working out 
the best for a number of contractors that I have recently spoken too.  I 
am just trying to figure out how to make my high voltage installations 
as safe as possible.

Graham

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