Old style distribution panels, those with screw-in fuses are normally considered fire hazards. The contact between the base of the fuse and the buss bar oxidizes or charcoals from poor contact. In many areas, insurance companies will not renew homeowner insurance if the home is equipped with an electrical distribution panel that has screw-in fuses.

If your current electrical service to your home is less than 200 amps, and/or if it has an unsafe distribution panel that uses screw in fuses, you should consider replacing it as a top priority in any major home improvement project.