September 22, 2022
Your home's electrical service is the maximum amperage (A) that can be safely delivered to your home by your utility. Over time, US homes have been built with more electrical service to support our ever growing electricity consumption. Most homes built in the 1950s or earlier were installed with 60A service. From the 1960s to 1980s, 100A-125A service was most common. For homes built in the 1980s to present, 200A service has been the standard. Today, large modern homes may even have 300A-400A service.
To determine your home's electrical service, you need to find your main breaker or disconnect. This is a plastic switch that controls the electricity flow from your utility to your home. The main disconnect breaker will be labeled with the service amperage e.g. 100, 125, 200, etc. To find your main breaker:
Here are some additional tips for finding the main electrical breaker:
Before installing your EV charger, an electrician is required to perform a residential electrical load calculation to determine if an EV charger can be safely installed in your home. Your EV charger can be safely installed if the load calculation with it installed is less than the total electrical service available for your home.