The NMTES is a record of average errors attributable to specific measurement transformers based on sample data submitted to Elexon by LDSOs. The process for submitting new data for addition to NMTES is detailed in BSCP515. NMTES can be used for the purpose of Technical Assurance of Metering Systems, complying with Codes of Practice 3 & 5, where individual measurement transformer error certificates are not available.
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