Solar Cable PV1-F in ducting underground.

Question

I am renovating and extending a rural property and am planning on getting a "my energy libbi" battery and solar system installed once the 3 phase modal and an installer is available. Due to space and planning restrictions the only suitable place to house these is in a plantroom/outbuilding detached from the main property. 
 I wish to install all cabling work in a series of ducts between the main property and the out building in the coming weeks. Are Solar Cable PV1-F suitable for burial in the ground? They will be in flexible service duct. Obviously these cable have no earthed metallic covering but these DC solar cables do not relay on ADS as a method of protection. 
 
 Any suggestions gratefully received.

mapj1 · Accepted Answer

It is certainly done to bury non-armoured cables in ducting, but it is unusual, and does raise eyebrows, and you need to be confident that the level of safety is more or less equivalent. To that end the duct you choose needs to be robust, probably twin wall, and with a route and depth that is unlikely to be dug up accidentally, and recorded clearly. The cables them selves probably have a spec something like this Photovoltaic Solar H1Z2Z2-K Cable which is "f ixed installations, internal and external, within conduit or systems, but not direct buria l" which would be OK - but please check with your particular cable maker. 
 
 And, how is ADS provided if the cable is dug up while the sun is shining ? 
 Mike

Solar Cable PV1-F in ducting underground.

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