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 Oklahoma Administrative Code (Last Updated: March 11, 2021)
 TITLE 165. Corporation Commission
 Chapter 35. Electric Utility Rules
 Subchapter 17. Frequency, Voltage, and Equipment Servicing Requirements

  SECTION 165:35-17-2. Voltage limits  

Latest version.
  • (a)   Secondary voltages. The voltage at the utility's point of delivery, as installed for each consumer, shall be maintained within the limits specified in (1) through (4) of this subsection. If a utility adopts any standard voltage not included in the table in (4) of this subsection, it shall advise the Commission that the Commission may establish appropriate voltage limits. Where three-phase service is provided, the utility shall exercise reasonable care to assure that the phase voltages are balanced. The preferred and tolerable voltage ranges conform to the current version of ANSI Standard C84.1, or equivalent ANSI standard as later amended.
    (1)   Preferred secondary voltages. The secondary voltage described above shall normally be maintained within the preferred range specified in the table in (4) of this subsection.
    (2)   Tolerable secondary voltage. The secondary voltage described above will be permitted in the tolerable range specified in the table in (4) of this subsection under abnormal conditions if it is limited in frequency of occurrence and duration, providing that measures are initiated within a reasonable period of time to bring the voltage within the preferred range.
    (3)   Emergency secondary voltages. Voltages outside the limits specified in (4) of this subsection may infrequently occur due to:
    (A)   Addition of significant loads without proper notice to the utility.
    (B)   Adverse action of the elements.
    (C)   Failure of principal supply line or equipment necessitating use of alternate routes.
    (D)   Temporary separation of part of the system from the main system.
    (E)   Causes beyond the control of the utility.

    (4)   Table.
                 
       
    PREFERRED VOLTAGE
    		 
    TOLERABLE VOLTAGE
    NORMAL
    		  
    RANGE
    		  
    RANGE
    VOLTAGE
    		  
    MINIMUM
    MAXIMUM
    		  
    MINIMUM
    MAXIMUM
    120
    		  
    114
    126
    		  
    110
    		  
    208Y/120
    		  
    197Y/114
    218Y/126
    		  
    191Y/110
    220Y/127
    240/120
    		  
    228/114
    252/126
    		  
    220/110
    254/127
    208
    		  
    197
    218
    		  
    191
    220
    416Y/240
    		  
    395Y/228
    436Y/252
    		  
    381Y/220
    440Y/254
    480/240
    		  
    456/228
    504/252
    		  
    440/220
    508/254
    460Y/265
    		  
    437Y/252
    483Y/279
    		  
    422Y/244
    487Y/281
    480Y/277
    		  
    456Y/263
    504/Y291
    		  
    440Y/254
    508Y/293
    440
    		  
    418
    462
    		  
    403
    466
    480
    		  
    456
    504
    		  
    440
    508
    832Y/480
    		  
    790Y/456
    873Y/504
    		  
    762Y/440
    880Y/508
    600
    		  
    570
    630
    		  
    550
    655
                 
    (b)   Primary voltages. The following limits shall apply where the utility supplies service at primary voltage.
    (1)   Industrial consumers. For services rendered principally for industrial or power purposes, the voltage shall not exceed ten percent (10%) above or ten percent (10%) below the nominal voltage of the low side of the transformer.
    (2)   Special contract extension. The limitations in (1) of this subsection do not apply to special contracts in which the consumer specifically agrees to accept service with a different voltage regulation.
[Source: Amended at 10 Ok Reg 2633, eff 6-25-93; Amended at 16 Ok Reg 2237, eff 7-1-99; Amended at 31 Ok Reg 1030, eff 9-12-14]