Reading a current transformer (CT) electricity meter can be confusing because the number you see on the meter display is not the same number used for billing on your electricity invoice. This is because transformer meters use a metering constant – a factor that multiplies the displayed reading to calculate the actual, billable consumption.

In practice, transformer meters are used by large consumers, such as industrial plants, factories, hotels, shopping centers, larger commercial buildings and other facilities with high connection power. In households, the measurement is direct, so no constant is applied.

For this reason, the following instructions are intended for companies and organizations that use CT meters, helping them correctly verify consumption and ensure it matches the billed amount.

Steps for Reading the Meter

1️⃣ Read the meter values:
1.8.1 = high tariff reading
1.8.2 = low tariff reading

2️⃣ Check the constant on your electricity bill:

3️⃣ Multiply the meter reading by the constant.

Example:
Meter reading: 120,000 kWh
Constant: 40
➡️ Billable consumption: 4,800,000 kWh

By reading the meter correctly and applying the appropriate constant, you can quickly verify whether the meter data matches the information on your bill. This helps you avoid misunderstandings, ensures accurate billing, and gives you full control over your electricity consumption.

If your company uses an automatic meter reading system, the verification process becomes even simpler. In the application, you can immediately see the billable consumption — the app automatically applies the metering constant and calculates the actual usage. This allows you to compare your bill with real consumption at any time, with no manual calculations or risk of error.