Measurement Error Correction (MEC) Voltage transformers (VTs) and current transformers (CTs) that do not meet the 0.3 Accuracy Class of IEEE Std C57.13 Standard Requirements for Instrument Transformers; A Measurement Error Correction will not be applied to VTs and CTs with accuracy's greater than 0.3 ANSI accuracy class until May 1, After May 1, 2006 a Measurement Error Correction equal to the ANSI accuracy class will be applied for each individual set of VTs and CTs. For example, VTs with a 0.6 ANSI and CTs with a 0.6 ANSI with give a Measurement Error Correction equal to 1.12 and the correction will always be in favour of the Market. Measurement Error Correction (MEC)- continued For FCF kVAR the cosine function in the FCF kW are replaced by the sine function. At this time all MEC for Reactive Power kVAR is not used in the IMO system and therefore, maybe omitted. Market Rules--Chapter Six Satisfactory to the IMO All consumption must be metered losses must be applied correctly as per market rules radial line losses express feeders, no taps transformation losses total loss factor (TLF) embedded, therefore must have a primary RWM meter MMPs area of responsibility does not change DMP DMP-continued