When rewiring a house, all materials and installation should adhere to the National Electrical Code. For example, the minimum size of electrical wiring required is No. 14 with 15 amp fuse protection. Some states and local governments have introduced more stringent regulations requiring No. 12 wire with a 20 amp fuse.
Before beginning to rewire a building, a complete design should be created that takes into account the present electrical needs of the building and over the coming years. By installing large electrical wire and extra circuits, the future electrical needs of a building should be addressed for years to come.
The minimum required electrical service panel for a building is 100 amps; rewiring installation should increase the capacity of a service panel beyond 100 amps, according to the Copper Development Association. The CPSC recommends the use of a qualified electrician to ensure electrical wiring installation is completed safely.