Most commercial electrical panels are designed for a 25 to 40 year service life, but the loads they support change a lot faster than that. New equipment, EV chargers, HVAC upgrades, and tenant turnover all push older panels past what they were designed for. Here are the seven signs facility managers should watch for, and what each one usually means.

1. Breakers trip frequently

Occasional trips happen. Frequent trips on the same circuit, especially under normal load, mean the breaker is either undersized for the load it serves or starting to fail. If breakers trip across multiple circuits, the panel itself may be overloaded.

Pull a circuit-by-circuit load reading before you start swapping breakers. A licensed electrician can run a load analysis in a couple of hours and tell you whether you have a circuit problem, a panel problem, or both. See our commercial panel upgrade page for what an evaluation looks like.

2. The panel cover is warm or discolored

Panel covers should never be warm to the touch. If they are, you have heat building up inside the panel — usually from a loose connection, a worn breaker, or chronic overload. Discoloration around the breakers or the bus bar is a more serious version of the same problem.

This is a fire risk. Stop using the panel and call a commercial electrician for an infrared scan. Thermal imaging will show you exactly which connection is heating up.

3. You smell burning or hear buzzing near the panel

Both of these indicate active arcing or sparking inside the panel. They are immediate safety hazards. Cut power if you can do it safely, and call for emergency electrical service. Do not open the panel cover yourself.

4. You have a Federal Pacific, Zinsco, or Pushmatic panel

These three brands have well-documented failure issues, including breakers that fail to trip during a fault. Most commercial insurers either flag them as high-risk or require replacement before they will renew coverage. If you have one of these panels, plan to replace it.

5. The building is at or above 80% panel capacity

The National Electrical Code recommends keeping continuous loads below 80% of breaker rating. A 200A panel running at 160A continuous is functionally maxed out, even if nothing is tripping. Adding new equipment, lighting, or EV chargers without first upgrading capacity will just push you into the trip zone.

A panel upgrade today is cheaper than emergency replacement after a tenant addition forces the issue. The same is true if you are planning EV charging stations, since each Level 2 charger draws 30 to 50 amps.

6. The panel cannot accommodate new circuits

If your panel is full, you have a few options: a sub-panel, a complete panel replacement, or a service upgrade. Sub-panels are the right call when the existing service is adequate but you need more circuit slots. Full replacement makes sense when the panel is also old, undersized, or one of the problem brands above. A service upgrade (going from 200A to 400A, for example) is what you do when the building’s overall electrical capacity is the bottleneck.

A licensed commercial electrician will tell you which one fits your situation after running a load analysis. Read more on what a commercial panel upgrade involves.

7. The panel is more than 25 years old

Even if the panel is still working, components age. Breakers fatigue, contacts oxidize, and bus bars develop heat damage that is invisible from the outside. A panel installed in the late 1990s is approaching the end of its rated service life, and most insurers and AHJs will start asking questions during routine inspections.

If you are planning a tenant improvement, an HVAC upgrade, or a capacity addition, fold the panel upgrade into the same project. Bundling avoids two rounds of permits, two shutdowns, and two inspections.

What to do next

If two or more of the above signs apply to your building, schedule a load analysis. Most commercial panel evaluations take a few hours and produce a clear, written assessment of whether you need a sub-panel, a full replacement, or a service upgrade.

Electrical Support Company performs free load analyses for commercial buildings throughout King and Snohomish counties. Call (425) 583-4869 or contact us online to schedule yours.

Browse all of our commercial electrical services for a full list of what we cover.