Section Puc 304.02 - Voltage Variation(a) For purposes of this section, "Y" means the 4 wire connection type used for a particular 3 phase electric system component.(b) Each utility furnishing electric service shall adopt a standard nominal average RMS voltage or voltages which are consistent with the design of the distribution system for its entire service area and for each of the districts or zones into which the distribution system or systems are divided from one of the following systems: (1) For secondary voltages of 120 and 120/240 volts, single phase 2-wire or 3-wire systems; or(2) For secondary voltages of 120/208Y, 240, 277/480Y, 480 and 600 volts, 3-phase, 3-wire or 4-wire systems.(c) A utility shall maintain the nominal secondary voltage at the utility's service terminals or at the street lamp in the case of multiple street lighting, as installed for each customer, within plus or minus 5% average RMS.(d) When a customer receives service from primary distribution voltage and is responsible for supplying its own voltage regulation, the utility shall maintain the nominal secondary voltage at the utility's service terminals as installed for each customer, within plus or minus 10% RMS, except as provided in (e) below.(e) When a customer is not responsible for its own voltage regulation, the utility shall maintain the nominal average RMS voltage at the utility's service terminals, as installed for each customer, within plus or minus 5%.(f) The requirements of (d) and (e) above shall not apply to transactions between utilities provided that primary customer voltage requirements are maintained.(g) Each utility shall submit a compliance plan for (c) above for commission approval.(h) Voltage variations outside of the limits in (c), (d) and (e) shall be allowed in accordance with American National Standards Institute (ANSI) C84.1-2011, available as noted in Appendix B.(i) A utility may vary from the voltage requirements provided by this section in a special contract provided that: (1) The permissible variation in voltage for service shall be specifically mentioned in the contract; or(2) A statement is included in the contract to indicate that the contracting parties are in agreement concerning the allowable variation.(j) When voltage measurements for detecting variations are required, a utility shall make the measurements at the utility's service terminals, or at the street lamp in the case of multiple street lighting, unless otherwise agreed to by the customer and the utility.(k) If voltage measurements are taken at places other than at the utility's service terminals or at the street lamp in the case of multiple street lighting, those measurements shall be corrected to the utility's service terminal or street lamp in the case of multiple street lighting.(l) The utility shall maintain the voltage and frequency delivered at the utility's service terminals or at the street lamp in the case of multiple street lighting, pursuant to Puc 304.01 and Puc 304.02(b), (c), (h) and (i).(m) Voltage outside the limits specified in this section shall not be considered a violation of this section when such variations:(1) Arise from adverse weather conditions;(2) Arise from operation of the affected customer's equipment at low power factor;(3) Arise from unbalanced operation of the affected customer's equipment;(4) Arise from failure of, or emergency maintenance on, equipment;(5) Are transient events on a system designed to good utility practice, as defined in Puc 306.01(b), arising from operation of system equipment during system protection, control, and switching activities;(6) Are caused by emergency system operating conditions or order of the independent system operator; or(7) Arise from actions of others.(n) A voltage variation shall not be considered a violation of this section if: (1) The variation does not occur more than once per day; and(2) Does not exceed 2 minutes in duration.N.H. Admin. Code § Puc 304.02
#2011, eff 5-4-82; ss by #2912, eff 11-26-84; ss by #4999, eff 11-26-90; ss by #6381, INTERIM, eff 11-27-97, EXPIRED: 3-27-97
New. #6605, eff 10-21-97; ss by #8448, eff 10-18-05
Adopted by byVolume XXXIV Number 24, Filed June 12, 2014, Proposed by #10603, Effective 5/21/2014, Expires5/21/2024 .