The 80% rule for electrical panels means continuous loads should not exceed 80% of a breaker or panel’s rating unless the equipment is specifically listed for 100% operation. This protects against overheating from long-running loads like HVAC, water heaters, and lighting that run three hours or more.
In practice, electricians size circuits so continuous loads are calculated at 125% (the inverse of the 80% limit), then select breakers and panel capacity accordingly. A common field finding is a panel that “looks” underused by space, yet its bus rating is already near limit due to several continuous loads. During inspections we follow Florida electrical codes and pull permits when required, and we routinely apply these checks for homes in and around Okeechobee.
Consider action if you notice any of the following:
- Breakers tripping during steady, hours-long appliance use
- Warm or buzzing panel cover under normal load
- Adding an EV charger or larger HVAC that pushes existing circuits near capacity
If you suspect overloading, schedule an electrical safety inspection before adding new devices.
Updated: 2026-09-26
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