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Upgrading 100 Amp Electric Service Panel to 150 Amp


By Dave Rongey - Summary:

Upgrading a Home Electrical Service Panel – The exact Size and Type of conductors may be identified to see if they are rated for a higher amperage, however when upgrading to a higher amperage panel it is typical to install new service conductors.

Upgrading a Home Electrical Service Panel

Electrical Question: My home has 100amp service with a “Pushmatic” panel. The incoming cooper line (underground) is rated as a # 4 line. The home has central AC air conditioner which is on a separate box off the original 100 amp service.
My question is this , can I upgrade my electric service to 150 amp while using the current line by upgrading my panel box to a more effective and efficient one ?
Thanks, Bob

This electrical wiring question came from: Bob, a Homeowner from Southold , New York.

Additional Comments: This website is a life saver!

Dave’s Reply:
Thanks for your electrical wiring question Bob.

Upgrading a Home Electrical Service Panel
An electric service upgrade where the amperage of the main electrical service will be increased will require new service feeder wire to be installed. The exact Size and Type of conductors may be identified to see if they are rated for a higher amperage, however when upgrading to a higher amperage panel it is typical to install new service conductors.

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2 Responses to “Upgrading 100 Amp Electric Service Panel to 150 Amp”
  1. Dave Rongey says:

    Hi Craig,
    No, the main breaker should never be replaced with a larger circuit breaker. In fact NONE of the original circuit breakers should ever be replaced with a larger circuit breaker. If a circuit breaker is tripping then a circuit analysis should be performed to find out what is causing the circuit to trip. The purpose of the circuit breaker is to prevent overheating of the circuit wiring and components when there is a problem or fault. Replacing a circuit breaker with a larger one will create a hazardous condition which could lead to a fire.
    Do not take chances, find the problem and be safe!
    Dave

  2. craig says:

    I’m tripping circuit breakers. Some times and the main 100 amp main is tripping. The small breakers are all 20 amp which is good. I would like to put in a 150 amp main to fix the problems. Can I do that?