de-rate

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  1. KeenPensioner

    De-rating a ring circuit

    Hi, I'm not an electrician but have worked as a mate and I'm studying in my own time - I know my limitations. I watch a lot of videos (John Ward and others) and have come across an issue I don't understand. An 80A 30mA RCCD has 4 Type B 32A MCBs hanging off it and the sparky () talks about...
  2. C

    Cable running close to central heating pipe, de-rate it?

    Evening, I’m normally an industrial electrician so never work in houses, but something I’m wondering about: If you run a cable through space between ceiling and floorboards, do you de-rate the cable for ambient temperature if there are un-insulated pipes sharing the space? Obviously it’s going...

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