Unless you’re rewiring your entire house (which isn’t likely unless you’re doing a major remodel), you’ll need to connect your new service panel with at least some of the existing circuits. This usually is not included in the cost of the service change. It really depends on the purpose of the upgrade. In addition, if you have an old fuse system, you will most likely replace the following (again, at an extra cost):
➤ The major appliance circuits
➤ The kitchen and bathroom circuits
➤ The water heater and possibly the furnace circuits
Existing branch circuits for lighting often can be left alone and simply tied into your new panel. (Each will have to be checked, of course.) If you are replacing an existing service panel on a three-wire grounded system with a higher-amp panel, you also will need to connect to the existing service. Only when you’re completely rewiring your home can you ignore the existing service and its location.
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