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Because the way an I beam works is that the top and bottom flanges are the pieces doing most of the work resisting the bending in the beam. They are not just there to attach things to. Depending on the location in the span it MAY be possible, but you'll need a SE to advise.

Hi all, A quick question, I had my consumer unit replaced last year, all done to regs at the time by electrician, tested, signed off etc. When installed 6 spare spaces were left for future proofing (was meant to be two but electrician ordered size more than needed, but no great issue there)...

It's a Total Station, as others have said it uses infrared to measure distances and sensors within the unit to measure horizontal and vertical angles, from these distances and angles levels and coordinates can be calculated as long as you have known points to start with. The calculations are...