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Meters (Certification) Regulations (Northern Ireland) 1998
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- 1998 No. 444
- SCHEDULE 1
- Regulation 9
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This is the original version (as it was originally made). Northern Ireland Statutory Rules are not carried in their revised form on this site.
Margins of Error
9.—(1) The maximum 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% for tests numbers 1, 2, 3 and 4 given in Table 2.
(2) The maximum error permitted for both single phase and polyphase transformer operated meters, when tested without transformers connected, shall not exceed plus or minus 1.0% for tests numbers 1, 2, 3 and 4 given in Table 2.
(3) The maximum error permitted for polyphase whole current and transformer operated meters, when tested with transformers connected, shall not exceed plus 1.7% or minus 2.7% for tests 5 and 6 given in Table 2.
(4) The maximum error permitted for polyphase transformer operated meters, when tested without transformers connected, shall not exceed plus 1.2% or minus 2.2% for test numbers 5 and 6 given in Table 2.
(5) 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%.
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