83 Ill. Adm. Code 501.170
Meter Accuracy Requirements
Section 501.170 Meter Accuracy Requirements
a) Prior
to installing a new, adjusted, refurbished, remanufactured or repaired gas
meter, a utility shall ensure that the meter's average accuracy is not more
than 1.0% slow and not more than 1.0% fast. If a utility finds that a meter is
more than 1.0% fast or slow, the utility shall repair or retire the meter.
b) When
a utility installs a meter, it shall verify the proper operation and settings
of all auxiliary and tertiary equipment prior to activating a customer's
service.
c) If a
utility determines that a meter is in service and is mechanically defective,
the utility shall repair or replace the meter.
1) The
utility shall repair or replace the meter within 48 hours if the defective
meter impedes the utility's ability to provide service to the customer, unless
the utility and the customer agree upon a longer time interval not to exceed 30
days.
2) If
the meter does not impede the customer's service, the utility must repair or
replace the meter within 60 days unless the utility and the customer agree upon
a longer time interval not to exceed 120 days.
3) If
the meter is of sufficient size that portions of a customer's structure require
modification to remove the meter, then the utility has 90 days to replace the
meter unless the utility and the customer agree upon a longer time interval not
to exceed 180 days.
d) A
utility shall test the accuracy of a meter, and verify the proper operation and
settings of auxiliary equipment and tertiary equipment, after the utility
removes the meter from service.
e) For
those metering installations where a utility transfers the auxiliary equipment
and tertiary equipment from an existing meter to a replacement meter, the
utility shall inspect the auxiliary equipment and tertiary equipment to verify
proper operation within 60 days after the meter exchange.