Re: Lamp limiter plus Variac tip
I would have thought that running a live chassis radio directly from the mains, with the chassis connected to neutral, then the RCD will only protect you (ie disconnect the supply and probably plunge the house into darkness after you get a shock) when you connect yourself between the set’s HT and mains ground. If you connect yourself between HT and chassis, a much more likely scenario, then the current flow is between mains live and neutral, and the RCD will not trip.
I’d sooner connect the set through an isolation transformer, then I can be sure the chassis is not live, and I can use earthed test gear without any drama. And I must be careful not to touch the HT, just as I would with a set with a built in mains transformer.
Stuart
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