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it can melt, im an electrician, doesnt have anything to do with your fuse, has to do with how much current is flowing and how long, not saying...
save yourself the money and get 2 12'' Phoenix Gold rsdc's and match em with the Phoenix Gold 1200 amp, its what im pushing and they are awesome...
you should always fuse to the wire size,otherwise wire could possibly melt before you trip your higher rated fuse