Paragraph 9 Margins of error

The maximum error permitted for both single phase and polyphase whole current and transformer operated meters, tested with transformers connected, shall not exceed plus or minus 1.5% for tests 1, 2, 3 and 4 given in Table 2.

The maximum error permitted for both single phase and polyphase transformer operated meters, tested without transformers connected, shall not exceed plus or minus 1.0% for tests 1, 2, 3 and 4 inclusive given in Table 2.

For polyphase whole current and transformer operated meters, tested with transformers connected, the maximum error shall not exceed plus 1.7% or minus 2.7% for tests 5 and 6 given in Table 2.

For polyphase transformer operated meters, tested without transformers connected, the maximum error shall not exceed plus 1.2% or minus 2.2% for tests 5 and 6 given in Table 2.

Where current and voltage transformers, which are intended to be used with meters, are not tested connected to a meter then the total error of the transformers at any load point throughout the rated range shall not exceed 0.5%; unless by matching transformers to meters enables the total error of meter and transformers to meet the requirements of paragraphs 9(1), 9(2), 9(3) and 9(4) above.