given that a nail gun can apparently shoot nails through steel conduit, and the fact that most (if not all) standard steel conduit has a wall thickness less than this oft-quoted 3mm figure, do you feel that steel conduit does not afford enough protection to satisfy BS7671?
Only if you are to completely ignore the fact that steel conduit IS NOT DESIGNED to prevent penetration. It is an exposed conductive part which MUST BE EARTHED.
As such, earthed metallic conduit is safe (and still isn't designed - nor has it ever been designed - to prevent penetration).
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