Practical limits
How the load check works.
The check uses the numbers you can usually find on the equipment label: watts, amps, voltage, quantity and whether items run together. It then compares the total amps with the socket or circuit rating you selected.
Watts divided by volts
A 2,000 W heater on 230 V draws about 8.7 A. Two items running together are added together. Hours affect daily energy use, not the instant circuit load.
Do not run flat out
The default 80% warning point leaves spare capacity instead of treating the circuit rating as a target. Cable warnings can still make a low-load setup unsuitable to rely on.
Review policy: calculation pages and guides are reviewed against deterministic load maths, visible evidence boundaries and stop-condition wording. Read the editorial review policy.