1. Specification for low-voltage switchgear and controlgear. Contactors and motor-starters. Electromechanical contactors and motor-starters Part 4-1, (15th June 1992) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (68 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
2. Specification for motor starters for voltages up to and including 1000 V a.c. and 1200 V d.c. Reduced voltage a.c. starters, two-step auto-transformer starters Part 4, (31st October 1977) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (25 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗