Work out the current an appliance draws and whether the circuit can support it.
Current is power divided by voltage and power factor. Continuous loads are conventionally limited to 80 per cent of the breaker rating, because thermal-magnetic breakers are not designed to sit at their nameplate current indefinitely. Adding a second high-power appliance to a circuit already at 70 per cent is the most common cause of nuisance tripping.
Current Draw
I = P ÷ (V × power factor)
I = P ÷ (V × power factor) Current is power divided by voltage and power factor. Continuous loads are conventionally limited to 80 per cent of the breaker rating, because thermal-magnetic breakers are not designed to sit at their nameplate current indefinitely.
Adding a second high-power appliance to a circuit already at 70 per cent is the most common cause of nuisance tripping.
This calculator takes 4 inputs: Appliance power, Supply voltage, Power factor, Circuit breaker rating. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.