SmartScreen Sample questions A answers Electrical Installations (Buildings and Structures) Which one of the following is the value of voltage drop, per ampere, per metre, (L3.3) 16 for a 10mm multi-core flat thermoplastic 70C cable, intended to supply a single-phase circuit? a) 44 mV/A/m 11 mV/A/m 4.4 mV/A/m 2.8 mV/A/m (L3.3) 17 . Which one of the following is the maximum current carrying capacity for a single-core 6mm2 70 C thermoplastic insulated non-armoured cable, enclosed in conduit on a wall installed for a single-phase circuit? 31A 32A 36A 41A 18 Which one of the following is the value of voltage drop, in millivolts per ampere (L3.3) per metre, for a 4mm multi-core thermosetting non-armoured cable, intended to supply a single-phase circuit? a ) 29 mV/A/m 18 mV/A/m 11 mV/A/m arrthiss to 7.3 mV/A/m 19. Which one of the following devices is suitable for an installation supplying an X- (L3.4) ray machine in a hospital? a ) BS 3036 rewireable fuse BS EN 60898 Type D BS EN 60898 Type C BS EN 60898 Type B 20. Which one of the following devices will disconnect in the fastest time if a short (L3.4) circuit current of approximately 400A occurred on a circuit? 32A/30mA Type C RCBO 32A Type B circuit breaker 32A Type C circuit breaker SOFTAN 32A Type D circuit breaker 21. Which one of the following is the minimum conduit size suitable for a short (L3 straight run containing the following stranded cables: 4 x 1.5mm 3 x 2.5mm? ? Nov 16mm 20mm 25mm 32mm 22. Which one of the following is the minimum conduit size suitable for a short straight run containing the following stranded cables: 8 x 1.5mm . 2 x 2.5mm2 2 x 4.0mm?? a) 16mm b ) 20mm 25mm 32mm 2025 City and Guilds of London Institute. All rights reserved. www.SmartScreen.co.uk