Ragnar, That sounds really silly. I'm all for good lightning protection and yes the conductors do need to be reasonably heavy, to match the current that they will carry in the event of a strike. But, how common is lightning where you are?. Seems rather excessive if the wire will never carry any actual fault current. And as Paul said, it is only a short eposed run. Your comments......
We're in an urban area with only underground supplies, and the only lightning strike we've had here in all the years (been living here all my life) hit a phone wire somewhere in the distance and shot our PABX. The earth rod is not only for lightning protection, it's a general requirement for TN-C-S and TT services. I'd love to bury NYY, but there's a concrete path butting right up to the house, so no way to get through... anyway, the garden hut probably won't ever be built, so I don't care much.
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