Ducting in a roof

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I'll tell why the question, SANS says: If any part of the installation is altered/renewed/modified....then the entire installation must comply to SANS 10142, regardless of its year of origin.

Now you have me worried. Can you please point me to the Sans reg. or OHS act which state the above? I was under the impression that the act makes provision explicitly for a) New installations , b) existing installations and c) Existing installations (to comply with clause 5 of sans) and the effected alterations/extensions to comply with complete sans 10142.

To try and answer the question, my opinion would be to just close the ducting, get someone with the equipment (bender/cutters) to manufacture the cover, screw it on the ducting. Make sure all exit and entry conductors/cables is mechanically protected at entry/exit points at the ducting. (ps it is ducting? not a cable rack?) and yes you are correct, it seems open wiring type is compliant, as long as it complies with sans 6.4.5 and 6.4.6, and if Wireways is used the 6.5 as well. But if the installation is an old installation (20 years+? you said?) then it is excluded from a type (b) or (c) (OHS Act) certification. (??)

I am always confused, it just varies on quality.... :-)