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Spacing around panels on tiled roofs

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Sorry if this was already covered, if so please point me to the thread.

What are the laws about how much space must be left around each panel or string?

I assume as long as there is a way to access the panel for maintenance without if becoming unsafe for the person working on it, but there must be some written law/guidelines?

And what about how much space can be left between the tile surface and the bottom of the panel?

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