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  • Report Tech Quiz Issues Here

    Question: Which of the following circuit breaker will produce the least arc energy?** Test's Correct Answer: Air blast circuit breaker I don't think this is correct at all. SF6 will produce the least. according to my research.

    Posted by jaybeesmith on 02-21-2025
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    A multimeter is device that is connected: Low impedance, series Low impedance, parallel high impedance, series high impedance, parallel Unless I am mistaken you are able to use a multi meter in series and parallel depending on whether you are testing voltage (parallel) or current (series).

    Posted by Random on 02-19-2025
  • We Value Your Feedback - Help Us Improve

    Good afternoon. I discovered a missing relay designation in this list for 50-Instantaneous Overcurrent Relay. The description and required tests are listed. I'm new to the site so it is possible there is a corrected list somewhere else already. Just incase I wanted to bring it to your attention. I was unable to list the full link but you should be able to f...

    Posted by LexLuther on 02-17-2025
  • Report Tech Quiz Issues Here

    Find the cotangent of a right angle. Correct Answer: 0 ? the Cotangent of a right angle is actually Undefined. by all resources i have found.

    Posted by jaybeesmith on 02-12-2025
  • Wrong Temp Calulation

    The key here is that it is a temperature difference. Not a direct temperature. So a 50C temperature rise could mean you measured 30C and 80C. If you convert these to fahrenheit you would get 86 and 176 or a temperature rise of 90 degrees. Your +32s cancel out when you are subtracting the difference between two temperatures. Hope that clears it up.

    Posted by Jay_Moseley on 02-07-2025
  • Wrong Temp Calulation

    Below is what I got for calculating Fahrenheit and i think its wrong. I am sure it is F=(C*1.8)+32 During a thermographic inspection, you measure a 50°C phase to phase temperature rise on the line side of a fused disconnect. Your customer requests a report in Fahrenheit. Convert the temperature rise for him. *Your Answer: 122°F* Correct Answer: 90°F Help...

    Posted by Geeman on 02-07-2025
  • Industry Standard Duration of Fall of Potential Test after Rainfall

    Thanks for the response! You're hitting on exactly the tact I've been thinking of taking and I agree, all I can find are customer specifications, mostly UFGS, DOD, Army, and VA. Between those, tables showing the resistivity differences of clay (wet/dry) vs DGA, which is very drastic, and reference against effects of moisture on resistivity. That may be th...

    Posted by BJHuffine on 02-07-2025
  • Most suitable power-factor test voltage for 13.8kV?

    THANKS! This has been bugging me for awhile.

    Posted by anderssok09 on 02-06-2025
  • Most suitable power-factor test voltage for 13.8kV?

    You are performing Power Factor test on a dry-type transformer >5kV which requires tip-up testing which is conventionally performed at 2kV. Also, it states 13.8kV transformer which means the test voltage must be kept within the phase to ground voltage rating, so they limit you to 8kV. Doble documentation states you are allowed to test at 10kV, but per IEEE ...

    Posted by Kalbi_Rob on 02-05-2025
  • Industry Standard Duration of Fall of Potential Test after Rainfall

    You typically will not fine a definitive time period for preventing FOP testing after a substantive rainfall. Throughout the years I've seen the same caveat spelled out in customer specifications(especially federal/military) which has become our office requirement: "Measure ground resistance no fewer than two full days after the last trace of precipitation ...

    Posted by Kalbi_Rob on 02-05-2025
  • Report Tech Quiz Issues Here

    Thank you for reporting. This error should now be corrected. Please reach out if you experience further issues.

    Posted by TestGuy on 02-04-2025
  • Report Tech Quiz Issues Here

    Pictures of the conductors to be identified to not show up

    Posted by user944 on 02-04-2025
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