Is this an old install with 1.0mm cpc?
Roughly for the figures given for the L&N, cable length would calculate to approx 62 metres
the cpc should calculate to approx 0.72 for a 1.5mm and 1.08 for a 1.0mm
you may even get a lower reading on the cpc if there are any parallel earth paths.
Not sure if I've missed something but on an recent enquiry to a local wholesaler, a fuseboard mini rcbo (double pole) type A would cost about £14.94 + vat
If wired as shown it doesn't make a lot of sense, so can only reiterate what others have said and say check the wiring.
Have you tried swapping the pwm outputs for the servos, what's the chance you have two duff ones (unlikely)?
If you have access to a laboratory power supply where you can limit...
As both servo feeds are from the same origin, and only one servo is overheating, I can only suggest at this moment that the pwm output from the Arduino may be programmed wrong or suspect?
@240V it would be a band pass filter rather than a band stop filter (parallel) Sorry I had assumed 12v or so, I think I need to read the whole thread so ignore me and go with the much more informed Marconi.
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc