51. Tracked Changes. Electrical accessories. Circuit-breakers for overcurrent protection for household and similar installations. Circuit-breakers for a.c. and d.c. operation Part 2, (4th January 2022) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (60 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
52. Tracked Changes. Small craft. Electrically operated bilge pumps. (22nd September 2021) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (34 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
53. Type F and type B residual current operated circuit-breakers with and without integral overcurrent protection for household and similar uses. (27th October 2022) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (54 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗