Idaho Administrative Code
Title IDAPA 31 - Public Utilities Commission
Rule 31.61.01 - RULES FOR THE MEASUREMENT OF STRAY CURRENT OR VOLTAGE (STRAY VOLTAGE RULES)
TESTING AND MEASUREMENT PROCEDURES
Section 31.61.01.074 - TEST 2 - FORTY-EIGHT HOUR TEST
Current through August 31, 2023
01. Purpose. This test is to determine whether stray current or voltage exceeds the PAL at selected location(s) over a forty-eight (48) hour period, subject to Subsection 074.06 and Paragraph 071.02.d. The test also demonstrates whether the primary or secondary sides of the system have a specific impact on the recorded current or voltage at specific times of day. (4-6-23)
02. Setup. A digitizing data recorder with averaging capability and capable of detecting and recording transient deviations of one-tenth (0.1) second or less in duration shall be used to record the following: (4-6-23)
03. Measurement Interval. The results of the forty-eight (48) hour test may be highly indicative of the presence of stray voltage. A recording interval as high as ten (10) seconds may be used provided that transient deviations of voltage or current of one-tenth (0.1) second or less in duration of voltage or current are recorded to the maximum ability of the instrument. (4-6-23)
04. Measurement at the Cow Contact Point(s). Measurements to the earth or concrete surface shall be to a metal plate as described in Paragraph 073.03.c. When making measurements to metal objects, corrosion shall be removed to obtain a low resistance connection. (4-6-23)
05. Recording the Data. Data gathered by the recording equipment during the forty-eight (48) hour test including transients shall be downloaded and retained with the records of the investigation. In addition, the steady-state data shall be summarized in the investigation report. The recorded data shall be made available to the dairy producer or utility upon request. The person conducting this test shall record the location of, and measured values at, each test point. The identification of the cow contact point shall be recorded on the form in Appendix 2. Transient deviations shall be recorded on the supplemental data form, page 3 of 3 in Appendix 2. A plot of the voltage versus time may be substituted for the recording of measured values in Appendix 2. (4-6-23)
06. Reduced Recording Period. If a qualified analyst concludes that remediation by the utility is required under Paragraph 071.02.d. prior to the completion of a forty-eight (48) hour recording period, the recording period may be reduced to no fewer than twenty-four (24) hours. (4-6-23)
