In some cases, designers require lighting and fans to be switched on together in social rooms or bathrooms. This common requirement can be recommended with all of our fans with one limitation. When operating with fluorescent lamps, we recommend using only quality luminaires with electronic ballasts that do not produce surges when switched off.
When the fan is on a common supply cable with some designs of cheap fluorescent lamps that contain operating chokes without compensation capacitors, extremely high surges can be generated when the fluorescent lamp is switched off, with pulses of one polarity exceeding 4 kV. This surge voltage exceeds the values of the standard required test voltage (that is, 1 kV wave for residential buildings, 2 kV wave for industry) and destroys the run-out elements in small fans. The equipment shall not be connected to wiring in which a switching surge voltage of 1000 V or more is present and with a steepness exceeding the requirements of the CSN.
In emergency cases, the PM 250 (5 kA) surge arresters supplied by us, installed on the control phase, can be used.