I have a Vaillant boiler and at the moment have a single 5-core cable running into the boiler, providing power (L,N,E) and two 230V connections for my thermostat.
I'm looking to replace the thermostat with a Vaillant model which uses a 24V "ebus" connection which transmits data back to the boiler to adjust flow temperatures etc, rather than relay switching the boiler on and off.
Is it acceptable to use the same 5-core cable to carry the mains power into the boiler, along with a 24V connection, or should separate cables be used for the two voltages?
I'm looking to replace the thermostat with a Vaillant model which uses a 24V "ebus" connection which transmits data back to the boiler to adjust flow temperatures etc, rather than relay switching the boiler on and off.
Is it acceptable to use the same 5-core cable to carry the mains power into the boiler, along with a 24V connection, or should separate cables be used for the two voltages?