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The Meters (Certification) Regulations 1998
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- 1998 No. 1566
- SCHEDULE 1
- Regulation 9
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Margins of error
9.—(1) The error permitted for—
(a)single phase and polyphase whole current meters and
(b)single phase and polyphase transformer operated meters when tested with transformers connected
shall not exceed plus or minus 1.5 per cent. for test numbers 1, 2, 3 and 4 given in table 2.
(2) The error permitted for both single phase and polyphase transformer operated meters, when tested without transformers connected, shall not exceed plus or minus 1.0 per cent. for test numbers 1, 2, 3 and 4 given in table 2.
(3) The error permitted for polyphase whole current and transformer operated meters, when tested with transformers connected, shall not exceed plus 1.7 per cent. or minus 2.7 per cent. for test numbers 5 and 6 given in table 2.
(4) The error permitted for polyphase transformer operated meters, when tested without transformers connected, shall not exceed plus 1.2 per cent. or minus 2.2 per cent. for test numbers 5 and 6 given in table 2.
(5) Where current and voltage transformers are intended to be used with meters and are not tested connected to a meter then the error of the transformers at any load point throughout the rated range shall not exceed 0.5 per cent.
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