If you would read my previous posts one of them has the answer for your #1
There is a dfference in the spacing when the conduit runs vertically or horizontally. I have my brown OSG in the van but looking in the old OSG (I do not think that these values were changed)
H=1.5m
V=1.75m
As was adviced before this values do not look good , I normally make the distances much smaller... Lectrician answer is a good one, I do about 500mm as well.
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