Conn. Agencies Regs. § 16-11-120 - Accuracy of watthour meters
(a) A watthour
meter that has an incorrect register constant, test constant, gear ratio to
dial train, or which creeps (that is, registers on no load), shall not be
placed in service or allowed to remain in service without adjustment and
correction after knowledge of the defect.
(b) The average meter error for a watthour
meter shall not be in excess of one per cent at unity power factor and, in the
case of polyphase meters, the elements shall be in balance within two per cent
at one hundred per cent load and unity power factor. When tested in the shop,
the error of polyphase meters shall not be in excess of two per cent at one
hundred per cent load and fifty per cent lagging power factor.
(c) Whenever a test of a watthour meter shows
the average error to be in excess of one per cent, or, in the case of polyphase
meter, the elements are not balanced within two per cent at one hundred per
cent load and unity power factor, the meter shall be removed from service or
adjusted.
(d) For the purpose of
pre-installation, installation, complaint, periodic or evaluation tests, the
average error shall be determined as follows:
(1) The error at light load, at approximately
ten per cent of the rated current (test amperes) specified for the
meter;
(2) the error at heavy load,
at approximately one hundred per cent of the rated current (test amperes)
specified for the meter;
(3) the
average error of the meter shall then be computed by taking one-fifth of the
algebraic sum of the error at light load and four times the error at heavy
load.
Notes
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