21. Specification for spark testing of electric cables. (1st July 1982) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (9 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
22. Specification for steel pipes and specials for water and sewage. (1st September 1982) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (17 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
23. Specification for thermosetting insulated cables (non-armoured) for electric power and lighting with low emission of smoke and corrosive gases when affected by fire. (29th September 1989) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (19 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
24. Tracked Changes. Explosive atmospheres. Equipment protection by type of protection "n" Part 15, (19th November 2019) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (144 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗