Electrical Systems Quiz 3-

Which one of the following documents covers the installation and design requirements of a basic domestic type electrical circuit

• a) BS7671
• b) BS6700
• c) BS5449
• d) BS EN 12056

Which one of the following is the most likely supply voltage type and rating used for an immersion heater within a hot water cylinder

• a) 110v ac
• b) 24v dc

Which of the following voltages would be found on a low voltage central heating wiring system

• a) 12v dc
• b) 24v ac
• c) 110v dc
• d) 110v ac

Which type of domestic electric circuit would you use to connect an immersion heater to.

• a) spur
• b) lighting circuit
• c) radial
• d) ring main

Which one of the following earthing arrangements uses an installation earth electrode as part of the earth fault path

• a) TN-C
• b) TN – C – S
• c) TT
• d) TN-S

which one of the following conductors connects an installations main earthing terminal to the incoming metallic gas supply service pipe

• a) CPC
• b) High integrity protective conductor
• c) Main protective bonding conductor
• d) Supplementary bonding conductor

Which one of the following conductors would normally connect the service pipes together beneath a combi boiler

• a) CPC
• b) High integrity protective conductor
• c) Main protective bonding conductor
• d) Supplementary bonding conductor

What is the normal rating of a rewireable fuse fitted to provide over current protection to an immersion heater circuit

• a) 5A
• b) 15A
• c) 30A
• d) 45A

A rubber bush or grommet would be used where

• a) a cable passing through a plaster ceiling
• b) a cable passing through holes in metalwork
• c) a cable clipped passing over another cable
• d) one cable passing over another cable

Which of the following would most likely be the first to be damaged if the current in a cable exceeds its current carrying capacity

• a) cable support
• b) cable insulation
• c) cable sleeving (sheathing)
• d) cable trunking