Service conditions
Load presets
Revenue impact
True monthly usage
—
Error kWh / month
—
Billing error / month
—
kWh = (true power in kW) × hours/day × days/month
Billing error = error kWh × rate
Power reading comparison
Form 12S (2 elements)
—
Measures directly
Form 2S (1.5 elements)
—
Assumes V L2 = V L1
—
—
—
Calculation breakdown
Blondel
Non-Blondel