ECN Forum Forums General Topics of the Trade Non-US Electrical Systems & Trades Are these ring circuits?

Those are the old Diazed fuse colours. Plenty of distribution boards still fully diazed fused.

At least Diazed/Neozed fuseboxes were safe though in so far as they didn't allow you to insert the wrong fuse cartridge and they're almost impossible to by-pass or use re-wirable fuses in.

Did the UK use a lot of boards that could use rewirable fuses?