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The cables are not individually protected, the load side of the fuse holders at the network end are bus tied together, at the main switch installation the cables are directly bolted to the live side of the main switch. the set up effectively 2 parallel fuses(per phase) mechanically linked together ...

Interesting consideration. From a theory perspective on the actual operation, rather than compliance: My understanding is that fuses directly in parallel don't really work as there's not likely to be any way to enforce even current flow between them. Any tiny difference in the wiring to each fuse or...