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EICR and IR Testing

Former Community Member
Former Community Member
Oh the bane of IR testing on EICRs

Now its just impracticle to disconnect all loads to carry out IR testing, I think everyone can agree on that. And that Phase and Neutral are connected then tested to earth.


This is what I do, and then test @250V as to avoid damaging any equipment in the installation. And unless the IR value was <.5 Meg, would not bother me. What BS7671 states, but BS7671 is maybe somewhat unclear in that if that voltage (250V) was used then .5meg value should used, but that value should only be used on SELV, and PELV. Now experience also tells me that even if you had a return 0.0, and then did Kohms by using the ohms setting, even values of 100Kohms are fine. (Actually can be much lower than this) and we are pretty clear that its not the cable reurning these values.


So question is when doing an EICR @ 250V, at what point would you recommend an FI? For me the value would have to be <.5Meg
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    Andy B


    As a brand new Technical Officer straight out of the box in the Post Office I was sent to the South London Parcel Office for 2 weeks to cover for the resident TO who was on leave. It was an old grim dirty environment with all the conveyors and other kit all run on DC installed in 1935. Glass fronted face plate starters. The conveyors running from the top to the bottom of the building. One conveyor band broke and I decided to replace it rather than do another repair. 2 days of me managing a team of engineers pull in the new band and pull the ends together with winches with counter weights jacked up. Filthy dirty hard work. The visiting engineering manager was so impressed with my efforts with the team I was offered a permanent job here with promises of loads of earning opportunities. I thanked him for his kind offer and told him I wanted to get back to a job with an electronics bias, clean sitting on my bum wielding a soldering iron and an oscilloscope probe. Later I became the engineering manager for the area and went back and the old boys said words to the effect I hope you are not going to do a big belt change again!
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    Andy B


    As a brand new Technical Officer straight out of the box in the Post Office I was sent to the South London Parcel Office for 2 weeks to cover for the resident TO who was on leave. It was an old grim dirty environment with all the conveyors and other kit all run on DC installed in 1935. Glass fronted face plate starters. The conveyors running from the top to the bottom of the building. One conveyor band broke and I decided to replace it rather than do another repair. 2 days of me managing a team of engineers pull in the new band and pull the ends together with winches with counter weights jacked up. Filthy dirty hard work. The visiting engineering manager was so impressed with my efforts with the team I was offered a permanent job here with promises of loads of earning opportunities. I thanked him for his kind offer and told him I wanted to get back to a job with an electronics bias, clean sitting on my bum wielding a soldering iron and an oscilloscope probe. Later I became the engineering manager for the area and went back and the old boys said words to the effect I hope you are not going to do a big belt change again!
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