Solar PV installations Flat roof new build.

Question

I am the Director of the management company and have recently come across Solar PV installations on flat roofs where the cables and MC4 connectors are exposed to elements. 
 Is that allowed? 
 They are part of a brand new developments. We still have NHBC guarantee. 
 Solar PV installation was causing all kinds of problems with functionality and output. Can someone help? 
 Thanks.

mapj1 · Accepted Answer

Generally, MC 4 connectors from reputable makes ( St&auml;ubli come to mind, there are many other makes) have an environmental rating of IP67 but only when the correct cable diameter is used and the glands are done up as per the instructions. This means they are then fine for short periods of immersion. However, generally cables and connectors left in the sun and the wind and the rain, will not last as long as the same part under some sort of shelter, even if it is just tucked under the panel, and I'd certainly expect things to be neatly tied up and not flapping about in the open or able to be trodden on or tripped over. 
 Apart from mis- assembly , as alluded above, the other problem is if they have been mated while damp, as then that sealing works against you and the ingredients for corrosion are sealed in, instead of out. 
 What sort of problems are you seeing - it is quite possible that the connectors are not the real problem, but rather like seeing mismatched screw heads on door handles can be a flag to check the rest of the woodwork, a sloppy approach to what you can see, may indicate the same (lack of) attention to detail in other areas less obvious. Mike.

Solar PV installations Flat roof new build.

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