When the house's age should prompt an inspection
The Consumer Product Safety Commission's guide to home wiring hazards says to look at the door and cover of your panel for a label or tag with a date and a signature or initials. The most recent date is your last inspection. Its rule of thumb: if that was 40 or more years ago, an inspection is overdue. Between 10 and 40 years, one is advisable, especially if you've added high-wattage appliances, outlets or extension cords. Under 10 years, you usually don't need one unless warning signs show up. If there's no label, CPSC says to use the age of the house as your guide.
A 2003 CPSC safety campaign also recommended inspections for homes 10 years and older that have had major renovations or new appliances added, and for homes that have been resold. Treat all of this as an inspection schedule, not an expiration date for the panel.
Warning signs that shouldn't wait
CPSC lists sizzling or buzzing sounds, overheating, the smell of hot insulation, and power outages as panel warning signs. Warm outlet covers or switch plates, flickering lights and a burning-plastic smell are on CPSC's list of electrical warning signs too (our guide to warm outlet covers explains what that one can mean).
If you see smoke, flames or sparking, get out and call 911. For anything else, call an electrician soon and tell them what you noticed and where. Don't touch the cabinet to feel for heat, and don't take the cover off: CPSC warns that opening the inside of the panel can expose live wires.
A tripping breaker points to a cause, not a new panel
CPSC's advice for all circuit breakers and fuses is to find out why a breaker tripped instead of just resetting it. The usual causes are too many things plugged into one circuit, a malfunctioning appliance, or a short circuit. CPSC's wiring guide puts a 15-amp circuit at about 1,500 watts and a 20-amp circuit at about 2,000, and its own example is a 1,400-watt hair dryer plus a 1,000-watt portable heater, 2,400 watts, too much for either kind of circuit. The same math explains kitchen breaker trips. Never put in a bigger fuse or breaker to stop the trips; CPSC says to get an electrician instead.
Before agreeing to a new panel, ask whether the problem is an appliance, one circuit, a loose connection, or the panel itself.
Adding a heat pump or car charger? Check capacity first
The Department of Energy's factsheet on panel upgrades notes that many modern homes have 200-amp panels, while older homes often have 100-amp ones. You can find your rating on a label on the utility meter box, a label on the panel, or the size of the main breaker, without removing any covers. If your lights dim when the furnace or AC starts, our guide on dimming lights covers when that's normal.
DOE separates two problems: physical space for more breakers, and electrical capacity for more load. A panel can be short on either one. Don't add up the breaker ratings and subtract them from the panel rating to see what's left. Breakers usually add up to more than the panel's rating, because appliances draw less than their breaker size and not everything runs at once. Ask the electrician for a load calculation that includes what you plan to add.
DOE also lists alternatives to an upgrade: more power-efficient appliances, circuit-sharing devices, and smart panels or smart breakers that limit how much the house draws at peak. Ask whether one of those fits before paying for a bigger service.
Philadelphia permit and PECO steps
In Philadelphia, L&I requires an Electrical Permit for installing, altering, replacing or repairing electrical systems, and a licensed electrical contractor has to do all electrical work. Routine maintenance, such as replacing a breaker, fuse, switch or receptacle, may not need a permit. If the job changes your electrical service, the City notes a separate PECO service and meter application may be needed. Ask who will pull the permit and whether PECO has to be involved. In Bucks or Montgomery County, check with your township or borough, since the City's rules don't apply there.
What to bring and what to ask
Keep a short log: what happened, when, what was running, and which rooms lost power. Pull together any inspection reports, the date on the panel label, past electrical repairs, and specs for equipment you plan to buy. Mention where you depend on extension cords or crowded power strips. The U.S. Fire Administration says never to use an extension cord with a major appliance and not to overload power strips, so that habit is often a sign you need more outlets or circuits, not necessarily a new panel.
Then ask: What specific finding supports replacing the panel? Could a targeted repair fix it? Does the plan replace only the panel, or also upgrade the service coming in from the utility? Can I see the load calculation? Get the answers in writing, tied to what the electrician actually found rather than the age of the house or a full-looking panel.