What's wrong in these pictures?
There had been a funny smell for the last few days, very similar to a dead animal (damn cat...) so not that much attention paid. Tonight noticed that the off-peak load was 3 kW down on the power consumption plot, storage heater connected via this switched fused connection unit was not powered up for some odd reason.
Looks like one end of the fuse carrier has overheated a little. New SFCU installed and all back working, checking it an hour or so later the new one is warm... I did check fuse carrier spring tensions. I guess this is just the dissipation in the fuse, it is after all carrying 13 A or as near as damn it.
The burnt out one has only been in use about 2 years as the old one was full of brick/plaster dust and the switch was dodgy. The old one was a SFCU but thinking about it now a plain SCU should be fine as each storage heater has its own 2.5 mm fixed wiring spur, 2.5 mm flex and B16 MCB in the CU. Am I correct in thinking that fuse is more of a liability than anything else?