Section 31.61.01.077 - TEST 5 - THE LOAD BOX TEST01.Purpose. To determine the extent to which the primary system contributes to stray current or voltage at cow contact points. For dairies with three (3) phase balanced primary service, the service provider shall perform Steps One and Two in Paragraph 077.02.b. below.02.Conducting the Load Box Test. This test shall be performed at the same time of day as the time(s) of highest cow contact voltage found in the forty-eight (48) hour test. During this test, voltage and current shall be measured and recorded at the points indicated in Figure 6.a. The load box test requires the recording of eight (8) data points during each of the five (5) test steps. The eight (8) data points that shall be measured or calculated and recorded for each step are:i. Primary line to neutral voltage, Vpri.ii. Load Box Current, Ilb.iii. Voltage at load box connection to secondary system, Vlb.v. Voltage from primary neutral at the transformer to remote reference ground rod, Vp.vi. Voltage from secondary neutral in the service panel serving the area of the cow contact to remote reference ground rod, Vs.vii. Voltage from primary neutral at the transformer to secondary neutral at the service panel serving the area of cow contact, Vps.viii. Cow contact voltage (Vcc) or current (Icc) at the same point(s) used in the forty-eight (48) hour test.b. Except for dairies with three (3) phase balanced primary service, the following five (5) test steps shall each be conducted for at least two (2) minutes: i. Step One: The load box shall be de-energized, the dairy shall remain "on,".ii. Step Two: The load box shall be de-energized, the dairy shut "off,".iii. Step Three: The load box shall be set to half load, the dairy shut "off,".iv. Step Four: The load box shall be set to full load, the dairy shut "off,".v. Step Five: The load box shall be set to full load, the dairy shall be turned "on,".03.Calculating the K Factor. The K factor is a calculated ratio (Vcc/Vs). The K factor should be less than one (1) because Vcc (cow contact voltage) should be less than Vs (the dairy ground to reference ground voltage). If the K factor is greater than one (1), then there is contribution to Vcc from sources other than Vs.04.Recording the Data. The person conducting this test shall record the location of, and measured values at, each test point. Data and calculation results for these test points shall be recorded on the form in Appendix 5.Idaho Admin. Code r. 31.61.01.077