How to Check Power Strip Overload
Plugging multiple appliances into a single power strip adds up their wattage. When the total exceeds the strip's rated capacity, the internal wiring overheats — a leading cause of residential electrical fires. This checker lets you add up to 10 devices and instantly see whether you're in the safe, warning, or overloaded zone.
A standard US 15-amp outlet can handle 1,800W. The recommended safe limit is 80% of that — 1,440W. High-draw appliances like microwaves (700–1,200W), hair dryers (1,500–1,875W), space heaters (750–1,500W), and electric kettles (1,000–1,500W) should ideally use a dedicated outlet. Avoid daisy-chaining power strips, which multiplies the risk.
To find device wattage, check the label on the back or bottom of the appliance. If only amperage (A) is listed, calculate watts as W = A × 120 (US voltage). For appliances with variable power (e.g., dimmers, inverter ACs), use the maximum rated wattage for a conservative safety check.
Frequently Asked Questions
Circuit breakers protect the house wiring but trip slowly — typically at 15–20A. A power strip can overheat and catch fire before the breaker trips, especially with older or cheaper strips that lack built-in surge protectors or thermal cutoffs.
No. Space heaters draw 750–1,500W continuously and should always be plugged directly into a wall outlet, not a power strip. Using a power strip for a space heater is a common cause of residential fires.
The 80% rule (NEC 80% continuous load rule) accounts for heat buildup over time. A circuit running at 100% of its rated capacity for extended periods will overheat even without triggering the breaker. Staying at 80% provides a thermal safety margin.