An insulation resistance test is performed on a particular piece of electric equipment. In addition to the resistance reading and date of test, what information listed below should be entered in the electrical log?
• Effect of temperature on insulation resistance readings • Purpose of recording data in the electrical log for future comparison and trend analysis • What information is already fixed/known from nameplates versus what must be captured at the time of test
• Which factor, if it changes between tests, would most affect how you interpret changes in insulation resistance over time? • When you repeat this test months later, what extra piece of information would you need to decide if a different resistance reading is better, worse, or just due to test conditions? • Of the choices given, which item is most likely to vary at each test and therefore needs to be logged with the reading and date?
• Identify which options are constant machine data that do not change from test to test • Think about how temperature affects resistance and why that matters for comparing readings • Decide which single extra data item will let you normalize or fairly compare future insulation resistance tests
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