Insulation Resistance Part 1 - Why do it?

Basic theory The reason why we carry out this important test

[no_short_circuit]

Thanks for taking the time to share your knowledge. As an adult learner this is one of the best explanations of IR that I've seen on YouTube. Looking forward to Part 2

[CaptainBlitz]

I just wanna say your style of presenting and teaching is just so good. That part about watching your device's resolution and being careful not to misread or misinterpret what your values are is such a common mistake and I'm glad you pointed it out.

[danielteyehuago]

Wow! This is video very informative and the best tutorial on the topic for me so far. I really appreciate it. Thanks for sharing it with us.

[davidpatterson]

Excellent explanation of insulation resistance testing, and graphics

[ronaldomac]

Thanks for this very instructional video, well layed out and easy to follow :)

[jbl]

Great graphics! Thank you. IR testing does not give an indication of conductor corrosion or if its ability to conduct electricity is adequate right? Is this test enough to give tenants confidence that main cables powering a house is satisfactory?

[rael]

3:07 I have seen that happen. A screw through a floor board was too long and went all the way into a wire bundle. Failed the megger check. We had to start pulling floor boards up and go hand over hand until we found the problem.

[rael]

Another safety follow published procedures. But also totally remove power from a circuit before touching it. Unplug the power cord or power supply ! Unplugging the power is the only real way to make sure the circuit is safe. Plus be aware that some systems have battery power also, with a hot battery bus. In some cases you must disconnect the battery as well as unplugging the power cord.

[rael]

Question: When a voltage is not specified for the megger check, and the 115 vac wires are rated at 600 voltage should be set on the megger? I always assumed that 500 volts should be used since 1, 000 volts is beyond the wire's rating. Is that logical?

[jmc]

I tested a single phase hvac pump at 15 mega ohms to ground on each leg. A short circuit was present but could not varify with meter. I also tested legs between each other and the ohms tested correct against factory spec. When you smacked the housing with a rubber mallet the short stopped. I still dont understand why i could not see the short to ground with meter when it was clearly shorted to ground.

[salarbadeel]

What is the test voltage needed for a 4160 3 phase motor, and what is the minimum acceptable IR for that ?

[olly]

Thank you for your efforts in producing this, it's appreciated. Just like your previous ones, it's very well presented and full of theory and real world content. I'm looking forward to the next episode, hopefully not too long away, as I am keen to see where you're last scenario of false positives etc is going as the AV pictures made me think where you were going. Great production. I've got the 1741+, how do you rate it?

[ww-sdpz]

Very interesting, surprised to see arcing of two 1.5v batteries.

[michealtran]

Thank you for your guide very important

[mathman]

Nice graphics what software do you use for that?