Double Insulated Wire [RE-wrenches]

[Robert Warren]

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Joel, 
 I can't speak for the rest of Europe, but in my 3.5 years working in 
the UK, double insulated wire is required and used not only for the PV 
interconnects, but for both DC and AC runs. MC cable or the equivalent 3 
or 4 other brands of DC cables with their own type of quick connects are 
used for the runs through the roof jack into the attic to the DC 
disconnect switch (often placed, inconveniently, it the attic, since  
the smaller living spaces don't leave many choices for an inverter 
mounting location over there). They also use MC wire from the disconnect 
over to the inverter (also usually placed in the attic, or "loft", as 
they call it). They don't use conduit as a general rule, and 
consequently, even the incoming service panels, meters, and associated 
wiring looks like hell, like a barn that was wired in the 30's. Even in 
commercial buildings, they use open trays for wire tying cables rather 
than running conduit, but they do have conduit. I just never saw it used 
very much. 
I like the fact that they can use MC connectors going into the 
inverters, as then the installers don't have to open up an inverter to 
install it. They also have double insulated AC wiring with a 4 prong 
locking connector for hooking up the AC to the inverter. 
 As for your second question, they have a different type of double 
insulated 2 conductor cable over there, and it really has 2 layers of 
insulation around the pair of insulated pair of wires. So it is actually 
triple insulated, and is quite good quality. I don't remember what it is 
called, but it would be marked CE, not UL, anyway. 
 From your questions, I asssume you have a non-US project?
Robert Warren
http://caribbean-solar.com/


joeldavidson at earthlink.net wrote:
> 
> Two questions to Wrenches with European installation experience:
> 
> 1. Is double insulated wire required for all PV system wiring or just 
> the > solar module interconnects?
> 
> 2. Is 2-wire Tray Cable (TC) with 2 single-insulated wires within an
> insulation jacket considered "double insulated"?
> 

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