Just want to gauge some views on the AMD3 CU's. My view is you don't need to have fire rated glands, metal glands or fire rated inserts or metal inserts in the metal cased CU. It was never intended that the metal CU was to RETAIN a fire, only that the CU was made from non-combustible material. I know that manufacturers and many electrical journalists went overboard with the CU requirements and as a result a lot of things were arried out to the AMD3 CU that were unnecessary and were all interpreted differently. It is my view that you can quite legitimately use standard rubber grommets in 20mm and 25mm holes drilled in the CU. The lid/facia does NOT need to be top hinged, tails need to be firmly secure in the entry point through ONE hole. Some of the grommets being offered for sale such as the TKS 32mm glands would not provide sufficient support for the tails like the Wiska TKS32 whereas the compression style glands do provide support. Non-combustible was the wording used in the Regulations not fireproof, they are two completely different requirements and the smart alecs who think they do mean the same thing are wrong. I spent years in the fire protection measures field and I know the difference.