Indiana Administrative Code
Title 170 - INDIANA UTILITY REGULATORY COMMISSION
Article 4 - ELECTRIC UTILITIES
Rule 1 - Standards of Service
Section 1-20 - Standard nominal service voltage; permissible voltage variation

Universal Citation: 170 IN Admin Code 1-20

Current through September 18, 2024

Authority: IC 8-1-1-3; IC 8-1-2-4

Affected: IC 8-1-2-33

Sec. 20.

Standard Voltage and Permissible Voltage Variation.

(A) Each public utility shall adopt a standard nominal service voltage, or standard nominal service voltages, as may be required by its distribution system for its entire constant voltage service, or for each of the several districts into which the systems may be divided, and shall file with the commission a statement as to the standard nominal voltages adopted. The voltage maintained at the customer's main service terminals shall be reasonably constant, as follows:

(1) For residential service, the voltage shall be within five percent (5%) plus or minus of the standard adopted, and the total variation of voltage from minimum to maximum shall not exceed six percent (6%) of the average voltage in cities and other incorporated places having a population in excess of 2,500, nor eight percent (8%) of the average voltage in all other places.

(2) A greater variation of voltage than specified above may be allowed when service is supplied directly from a transmission line, or in a limited or extended area where customers are widely scattered or the loads served do not justify close voltage regulation. In such cases the best voltage regulation should be provided that is practicable under the circumstances.

(B) Variations in voltage in excess of those specified, caused by (1) the operation of power apparatus on the customer's premises which necessarily requires large starting current, (2) the action of the elements, and (3) the infrequent and unavoidable fluctuations of short duration due to station operation, shall not be considered a violation of this rule.

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