L.V. and E.L.V, cables running together.

It only becomes a real problem in terms of safety,  if the outer jacket on the T and E were missing - then it would be LV and ELV sharing containment, and if the insulation on the bell wire has to be neglected for the mains purposes, then it becomes single fault to danger. With the T and E jacketed, it is more like singles in a (thin) plastic conduit, which we would consider adequate segregation.

From an EMC perspective it still  is not a good idea to run cables that feed electronics next to mains wiring. An old fashioned coil hammer and bell is unlikely to be affected, but a modern synthesised electronic unit perhaps with a radio link, that plays 'Colonel Bogey' or whatever may not be as tolerant of spike when the fridge kicks in.

It only becomes a real problem in terms of safety,  if the outer jacket on the T and E were missing - then it would be LV and ELV sharing containment, and if the insulation on the bell wire has to be neglected for the mains purposes, then it becomes single fault to danger. With the T and E jacketed, it is more like singles in a (thin) plastic conduit, which we would consider adequate segregation.

From an EMC perspective it still  is not a good idea to run cables that feed electronics next to mains wiring. An old fashioned coil hammer and bell is unlikely to be affected, but a modern synthesised electronic unit perhaps with a radio link, that plays 'Colonel Bogey' or whatever may not be as tolerant of spike when the fridge kicks in.