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hopeful  
#1 Posted : 20 June 2016 16:01:59(UTC)
Rank: Super forum user
hopeful

I was speaking with colleagues about possible risks with antenna on roofs etc and they asked about Solar Panels. I have done some searching and so far have drawn a blank. Is anyone aware of any safety risks to people if they were to be on the roof where there are solar panels present, could be in close proximity Thank you in advance
gerrysharpe  
#2 Posted : 20 June 2016 17:06:18(UTC)
Rank: Super forum user
gerrysharpe

Can't see much of a hazard if you go up on the roof, Its apparent you won't be able to step or walk up the Solar Panel. If your working near them then you might get a glare from the sun as a reflection off the glass But if your secure on your scaffold or whatever, that should pose a problem. There was an issue a few years back where pedestrians were injured when about 6 inch of snow fell from the roof where the solar panels were fitted, send about an area of 30 ft x 20ft of snow 6 inches deep on top of two people who way on their way to the shops, so not sure if the solar panels owners would have to get some sort of Insurance or fit something up at gutter level to prevent the snow sliding off the smooth panels.
paul.skyrme  
#3 Posted : 20 June 2016 19:02:24(UTC)
Rank: Super forum user
paul.skyrme

gerrysharpe wrote:
Can't see much of a hazard if you go up on the roof, Its apparent you won't be able to step or walk up the Solar Panel. If your working near them then you might get a glare from the sun as a reflection off the glass But if your secure on your scaffold or whatever, that should pose a problem. There was an issue a few years back where pedestrians were injured when about 6 inch of snow fell from the roof where the solar panels were fitted, send about an area of 30 ft x 20ft of snow 6 inches deep on top of two people who way on their way to the shops, so not sure if the solar panels owners would have to get some sort of Insurance or fit something up at gutter level to prevent the snow sliding off the smooth panels.
Well, correctly installed, they are supposed to be "self-cleaning"! ;)
paul.skyrme  
#4 Posted : 20 June 2016 19:09:44(UTC)
Rank: Super forum user
paul.skyrme

hopeful wrote:
I was speaking with colleagues about possible risks with antenna on roofs etc and they asked about Solar Panels. I have done some searching and so far have drawn a blank. Is anyone aware of any safety risks to people if they were to be on the roof where there are solar panels present, could be in close proximity Thank you in advance
OK, are you thinking of physical or electrical hazards. The physical hazards are obvious, they are there to fall into! ;) Reflection glare has already been mentioned. IF correctly installed: They should be rigid and static. There should be no electrical risk as there should be no exposed conductive parts. They should be self-supporting, thus in no danger of collapse. What concerns do your people have? What work are they undertaking near these panels? Remember that there is a statute law requirement that they are installed in compliance with CDM, which mandates that the requirement any subsequent maintenance is “enabled”, thus there is a statute law duty for them to be safe to work on and around. If they are not safe to work around then someone has committed a criminal offence… Ignorance of the law is not a defence & all that! Please expand more on your concerns.
James Robinson  
#5 Posted : 21 June 2016 08:53:26(UTC)
Rank: Forum user
James Robinson

As Paul post #4 Also, remember that these systems do increase the loading on the roof, and you may find that this needs to be factored in if you are going to build a scaffold, place an air con unit, etc. But as Paul has said this would already be in the CDM health and safety file.
Alfasev  
#6 Posted : 21 June 2016 09:36:15(UTC)
Rank: Super forum user
Alfasev

One risk with PV is that they continue to generate power during daylight and the electrical cables remain live with DC current up to the isolation switch. There are normally two isolation switches, one as close to the panels as possible and one close to the inverter. Unlike a lot of electrical circuits if you receive an electrical shock from this cable it will not trip out. Depending on how the panels are wired this can result in a significant current but even a single panel will produce 12v which while very unlikely to kill you directly will give you a nasty continues shock. An electrical test during periodic maintenance should detect any issue with the cables however there remains the risk of accidental damage.
chris42  
#7 Posted : 21 June 2016 12:33:00(UTC)
Rank: Super forum user
chris42

I have wondered in the past if these installations would encourage birds to use the structure to build their nests. If it does I guess it could increase the risk of attack from birds with young. I know seagulls are quite nasty if they feel threatened. Perhaps those that deal with maintenance of these installations, can confirm or not if they have this possible issue. Perhaps this is something you already take account of with the work you do anyway. Just a thought. Chris
paul.skyrme  
#8 Posted : 21 June 2016 17:38:58(UTC)
Rank: Super forum user
paul.skyrme

Alfasev wrote:
One risk with PV is that they continue to generate power during daylight and the electrical cables remain live with DC current up to the isolation switch. There are normally two isolation switches, one as close to the panels as possible and one close to the inverter. Unlike a lot of electrical circuits if you receive an electrical shock from this cable it will not trip out. Depending on how the panels are wired this can result in a significant current but even a single panel will produce 12v which while very unlikely to kill you directly will give you a nasty continues shock. An electrical test during periodic maintenance should detect any issue with the cables however there remains the risk of accidental damage.
Alfa, One would not feel 12V dc as there is inadequate potential difference to drive the current through the resistance of the body, 12V is generally considered safe. Remember one can touch both terminals of a car battery and feel nothing, a typical lead acid car battery is capable of delivering several hundred amps instantaneously to drive the starter motor, however the PD is inadequate to drive this through a human being. Well almost all, there will probably be a few in the population who will sense it, but in general and in the standards and models 12V is considered safe. Any accidental damage must be immediately reported though. Yes the panels do generate at all times when they have enough light, and they can generate under certain artificial light conditions, and even on a VERY strong clear moonlit night, but obviously at a lower level. I would be more concerned about strings, noting that there is the potential for some strings on the dc side to reach 1kV, yes 1kV. However, as the equipment will have been competently installed, inspected & tested, it will be fundamentally safe, and the 1kV will be no more dangerous than any other electrical supply. That is always providing it was correctly and competently installed etc.!
saferay  
#9 Posted : 22 June 2016 16:06:33(UTC)
Rank: Forum user
saferay

Fire risk. We recently had a school roof go up in flames. There have been several recorded instances over the past couple of years or so. A good means of escape should be identified.
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