Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This one, concerning a 30mA RCBO that fails to trip when tested during a periodic inspection, is answered by the NICEIC:
Alternatively, would a Code 2 (improvement required) be more appropriate and a 'satisfactory' test sheet returned?
Answer: Any Code 1 or Code 2 deviation should have an 'unsatisfactory' outcome.
An RCD failing without adequate earthing arrangements in place being relied upon would warrant a Code 1 outcome.
Please refer to attached guide for reference.
With adequate earthing to allow ADS, and the RCBO being installed as additional protection, then a Code 2 - potential risk under fault conditions - should be issued.
Please click on the link below to download the attachment (PDF doc - 771kB file size).
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