Analyzing The Collected Data (Rule 81)

01. Cow Contact Points. Examine the data recorded for the forty-eight (48) hour test in Appendix 2 and determine the highest steady state value of cow contact voltage (Vcc) or current (Icc). Determine the value of primary neutral to reference voltage (Vp) that was present for the highest cow contact value. Record these values on the data sheet of Appendix 7. These values shall be identified as “test cow contact voltage or current” ( or ) and “primary neutral to reference voltage at time of maximum cow contact voltage or current” ( ). The three (3) data sets created from the values are: (4-6-23) a. The primary to reference ground voltage and the cow contact voltage or current measured during the load box test (Appendix 5) with the farm power “off” and the load box “off” shall be recorded on the data sheet of Appendix 7 as and either or . (4-6-23) b. The primary to reference ground voltage and the cow contact voltage or current measured with the load box set at one-half (1/2) load shall be recorded on the data sheet of Appendix 7 as and either or . (4-6-23) c. The primary to reference ground voltage and the cow contact voltage or current measured with the load box at maximum shall be recorded on the data sheet of Appendix 7 as and either or . (4-6-23) 02. Contributions to Stray Voltage or Current for Single Phase Dairies. The utility contribution to cow contact voltage or current shall be determined using the following formula. Compare the values determined to the preventive action level (PAL). Utility contribution to cow contact voltage = or Utility contribution to cow contact current = (4-6-23) 48hr Vcc 48hr Icc 48hr Vp OFF Vp OFF Vcc OFF Icc LOAD HALF Vp LOAD HALF Vcc LOAD HALF Icc LOAD FULL Vp LOAD FULL Vcc LOAD FULL Icc HALF FULL HALF 48 Vp - Vp Vp - Vp ) Vcc - (Vcc x HALF FULL HALF Vcc  HALF FULL HALF 48 Vp - Vp Vp - Vp ) Icc - (Icc x HALF FULL HALF Icc  IDAHO ADMINISTRATIVE CODE IDAPA 31.61.01 Idaho Public Utilities Commission Stray Voltage Rules Section 082 Page 15 03. Contributions to Stray Voltage or Current for Three Phase Dairies. The utility contribution to cow contact voltage or current for dairies with three (3) phase balanced load service, shall be determined by directly using the results of the load box test results for Step 1 and Step 2 as specified in Paragraph 077.02.b. (4-6-23) a. The Vcc measured during Step 1 of the load box with the load box “off” and the dairy “on” will be the total Vcc. (4-6-23) b. The Vcc measured during Step 2 of the load box test with the load box “off” and the dairy “off” is the contribution to Vcc from the utility, Vccutility. (4-6-23) c. The contribution to Vcc by the dairy is the difference between Vcc and Vccutility, Vccdairy = Vcc - Vccutility. (4-6-23)