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Hello nicam49 You may find the IET comments at <https://electrical.theiet.org/wiring-matters/issues/65/inspection-and-testing-of-earth-electrodes/> of interest

Thank you for all the replies. The olives are not thin but quite substantial, the edges are perhaps slightly thicker than the ordinary smooth olives and were for copper pipes - I do not have any plastic water pipes in the house. The central area between the grooves is painted black on these...

Sorting through my boxes of plumbing bits I found some of my brass 1/2" & 3/4" (15/22mm if you like!) olives had two narrow grooves cut round the outside. It seems that the purpose is to allow the olives to compress more easily as the compression nut is tightened. I've had a look in various...

Repair now sorted! The isolation transformer, which I assumed was 1:1 ratio was, in fact, providing about 278VAC on the secondary, which I thought might be a little high for the replacement DerLite generator module as I had no idea if the internal circuit had protection from fast high voltage...

I haven't checked the isolating transformer output as yet, but the Stoves manual shows the secondary winding connected to the board with the individual microswitches for each burner in series to the board inputs to trigger the 4 electrodes. I was told this replacement was correct for the hob...

Thanks for the suggestion, but I am already on the Appliances Forum - it was after further searching I found gas hob electrics on this one! Regards RodF

[After a further search this query may be more appropriate to this Forum] The spark generator PCB in our hob is an APCO 16440 from 1998 and has an isolation transformer between it and the mains and an earth connection, plus the four EHT leads to the burner electrodes and four wires to the...

The spark generator PCB in our hob is an APCO 16440 from 1998 and has an isolation transformer between it and the mains and an earth connection, plus the four EHT leads to the burner electrodes and four wires to the corresponding knob microswitches with the common back to the transformer...