Hi, electrical reg.528.3.1 (for the pedants who want to check) says
A wiring system shall not be installed in the vicinity of services which produce HEAT, smoke or fumes likely to be detrimental to the wiring, unless it is protected from harmful effects by shielding arranged so as not to affect the dissipation of heat from the wiring.
Our guidance book on installation suggests 50mm as minimum distance, and should never be in contact with other services.
Sorry for late answer but not often on this part of forum, normally on leckie bit,
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