Matt asks this question, which concerns Amendment 3 consumer units (CUs) and the use of semi-blind grommets. It has been answered by the NICEIC (Theme – Distribution Equipment including Cable Management):
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Question: I’ve seen various comments about using semi-blind grommets for cable entry on metallic Amendment 3 consumer units.
I can see nothing that refers to whether they should be fireproof or not - or if so, what standard of fireproofing is acceptable?
Some pointers as to acceptable standards and maybe even specific products would be appreciated.
Answer: Where practical, entry points into a metallic consumer unit should not unduly reduce the fire protection provided by the consumer unit enclosure. This can generally be achieved by complying with Regulation 416.2.1 (IPXXB or IP2X) on the top surface and Regulation 416.2.2 (IPXXD or IP4X) elsewhere.
There are many products on the market that can help you achieve these requirements.
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