The meter cabinets depending on the load is 3P or 1P load type.

• With 3P load with max current <100A, use direct 3P meter. Direct 3P meters are made of all kinds. 10 / 20A, 10 / 40A, 20 / 40A, 30 / 60A, 50 / 100A.

• For 3P load with max current> 100A, use an indirect meter to combine current to secondary current as 1A or 5A.

• With the 1P load is usually small capacity using direct 1P meter: 3 / 9A, 5 / 20A, 10 / 40A, 20 / 80A, 40 / 120A.