Safe zone for lighting

That's always been my thinking, but - without a door,

are there any situations where it would not be possible to "determine from the reverse side" and if so, what does that mean regarding the accessory and 'safe zone'? Not allowed?
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Maybe if access to the space the other side of the wall was not easy, and relative positions of items hard to establish without plans and measurements.

As for the zone, it would have to be a spectacularly thin wall for it to be impossible for the cable on one side to not be 50mm+ deep on the other.
Then you're doomed if circumstances do not allow you to determine the position of accessories on the other side and steel conduit can't be used.
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Not arguing - just wondering what the regulation actually means.

They are, of course, only used for internal walls so it is possible to access the other side.

It's just that there might not be a door in that wall.
Is it possible to fit a door in such a thin wall (withouth it looking silly)?

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