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Safe isolation - are you sure you are safe?

Susannah Girt

In the September issue of Wiring Matters e-newsletter, one of the articles looks at the case of 'Colin', a recently qualified electrician carrying out a safe isolation procedure. Unfortunately for Colin, he makes an oversight which leads to him receiving an electric shock.

Read the article here and let us know what would have been your safe method of working for the job Colin had.

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  • Susannah's diagram looks different to the one in the article to me - the above is TN-C-S while the one in the article is (now) TN-S. I wonder if the story started out as a L-PEN reversal...?

    Its also not very clear how he got a bad  shock - if all exposed cores are live how was the shock path completed - one foot in an external flower bed perhaps?

    The article seems to say the c.p.c. to the fitting was open circuit, but due to the reverse polarity "N" was at 230V, L & PE floating. So shock between "N" and some adjacent earthed metalwork perhaps could be plausible.

      - Andy.

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  • Susannah's diagram looks different to the one in the article to me - the above is TN-C-S while the one in the article is (now) TN-S. I wonder if the story started out as a L-PEN reversal...?

    Its also not very clear how he got a bad  shock - if all exposed cores are live how was the shock path completed - one foot in an external flower bed perhaps?

    The article seems to say the c.p.c. to the fitting was open circuit, but due to the reverse polarity "N" was at 230V, L & PE floating. So shock between "N" and some adjacent earthed metalwork perhaps could be plausible.

      - Andy.

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