4 Outdated and Unsafe Electrical Panels That Could be Fuse boxes are old electrical panels that use fuses instead of circuit breakers to protect your wires from becoming overloaded. When a circuit draws too much electricity, the fuse burns out and must be replaced. Why they’re unsafe : Fuses aren’t inherently unsafe. What are the code requirements for an old fuse panel/box? Jun 18, 2018What are the code requirements for an old fuse panel/box? Monday, June 18, 2018 So, although these safety features for old fuse panels have been mandated by the NEC, the insurance company will probably have the final say on whether these old-style panels are still acceptable.