- (a) Standard frequency. An electric distribution company supplying alternating current service shall adopt and file with the Commission a standard frequency or frequencies for its system, the suitability of which may at any time be determined by the Commission.
- (b) Allowable variation. An electric distribution company shall maintain the system frequency within 3% of the standard frequency adopted. Momentary variations of frequency of more than 3%, which are clearly not due to lack of proper equipment or reasonable care on the part of the electric distribution company will not be considered as violations of this section.
- (c) Records. An electric distribution company shall continuously monitor and record system frequency variations. The records shall be provided to the Commission on request.
Source
The provisions of this § 57.15 adopted February 25, 1946; amended through May 29, 1973; amended May 21, 1999, effective May 22, 1999, 29 Pa.B. 2667. Immediately preceding text appears at serial page (246378).