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A hazardous zone is an environment where explosive gasses or dusts are present in concentrations that could ignite and cause fires and/or explosions. A hazardous zone is classified under 1 of 6 types of Zones. Zone 0,1 or 2 for explosive gas atmospheres and Zone 20,21 or 22 for explosive dust atmospheres.
The plant or mine owner is responsible to do the classification
Yes, This Certificate is the property of the Client and must be supplied with any piece of Ex equipment purchased.
Under NO circumstances is this allowed. This is what is called a modification to a luminaire and that will invalidate the IA certification immediately and render the equipment non-Ex.
Maintenance is the replacement of lamps (like for like) and cleaning, checking gland seals, etc. Repair is if a part (i.e. a ballast) fails and needs to be replaced. Then the equipment must be repaired by a competent person (SANS 60079-19 compliant). Modification is ANY change that is made that was not as per the original OEM manufacturer's design. This includes drilling holes in IP rated fittings, replacing lamps with LED lamps, making modifications to the wiring inside the luminaire to through wire them etc.
Yes, but there will have to be a re-certification done on the LED driver, an IA certificate needs to be issued for the change and the luminaire needs an IA certificate revision to reflect these changes, at an additional cost.