1) The separate circuit breakers for all types of different electrical equipment within a dwelling, are contained in the a) Supplier’s sealed fuse unit b) Supplier’s meter c) Consumer unit d) Residual current device. 2) Which one of the following appliances should have its own separate connection to the consumer unit? a) An immersion heater. b) An electric fire. c) A bathroom light. d) A freestanding fan heater. 3) The main equipotential bonding point to earth the hot and cold services, would usually be located a) Near to the cold water storage cistern b) On the cold water supply pipe as it enters the property c) On the cold feed to the hot water storage cylinder d) Behind the panel under the bath. 4) The normal voltage of the electric supply to a dwelling is a) 110 V alternating current b) 240 V alternating current c) 240 V direct current d) 415 V three-phase supply. 5) The rating of a miniature circuit breaker, in a consumer unit in a dwelling that is only feeding a gas central heating system, is usually sized at a) 6 amps b) 12 amps c) 16 amps d) 20 amps. 6) The miniature circuit breaker in a consumer unit for a ring main circuit in a dwelling is usually sized at a) 6 amps b) 18 amps c) 20 amps d) 32 amps 7) Pipe work that is not earthed by the main bonding conductor to the property, should be earthed by providing a) Short circuits b) Bypass circuits c) Complimentary bonding d) Supplementary bonding. 8) Which one of the following must be contacted if damage to the main supply cable to a dwelling is discovered during installation work? a) The fire authority. b) The Local Authority. c) The electricity supplier. – Should be DNO (distributor Network Operator) d) The main contractor. 9) Which one of the following appliances in a dwelling usually requires a 2.5 mm² minimum heat proof flex? a) An electric shower. b) An electric immersion heater. c) A central heating pump. d) A macerator type WC. 10) When power to an appliance is turned off, power flow through both the phase (live) and neutral conductors can be prevented by the use of a a) Double pole switch b) Single pole switch c) Fuse d) Ring circuit. 11) Which one of the following should have a label attached which reads ‘Safety – Electrical Connection – Do Not Remove‘? a) Bonding connection clamp. b) Phase supply to a consumer unit. c) Neutral supply to a consumer unit. d) Temporary bonding clamps. 12) Which one of the following should not be positioned within reach of a person using a bath or shower? a) Pull cord light switch. b) Macerator type WC. c) Standard rocker plate switch. d) Shaver supply unit. 13) In addition to main equipotential bonding of services within a building, supplementary bonding may also be required where a) Metal pipes of different materials are used eg copper and steel b) The different services enter the building at widely spaced points c) Plastic waste systems are used d) Metal pipe work is jointed by plastic connectors. 14) When connecting cabling to a three-pin plug, the connections should be made in a way to ensure that should the cable be pulled with sufficient force to remove it from the plug a) The earth connection would be the last to be broken b) The phase connection would be the last to be broken c) The neutral connection would be the last to be broken d) All connections should break simultaneously. 15) Where a twin and earth cable connects to a fixed appliance, any exposed earth wire should be covered with a section of a) Green and yellow sheathing b) Brown insulating material c) Black insulating material d) Blue insulating material. 16) A rubber bush or grommet would be used where a) A cable passes through a plaster ceiling b) A cable passes through holes in metalwork c) A cable clip passes over a cable d) One cable passes over another cable. 17) Where cables pass through holes in timber joists, the maximum diameter of the hole in relation to the depth of the joist to meet regulations requirements, should be a) 0.2 depth b) 0.25 depth c) 0.5 depth d) 0.75 depth. 18) Cables buried in plaster walls should a) Not be less than 4 mm² cross section b) Clipped at intervals of not less than 300 mm c) Be protected by a metal or plastic sheath d) Be single-core insulated and sheathed type. 19) Which one of the following applies when installing electric cables? a) Cables run through floor joists should pass through holes not more than 25 mm from the top of the joist. b) b) Before making connections to plug sockets or fixed appliances, cables must be stretched tightly. c) c) Cables runs under loft insulation should be avoided due to the cable becoming heated. d) d) Horizontal cables should run at an equal distance between the floor and ceiling. 20) The main wiring connections for the components of a fully pumped heating system are usually accommodated in a a) Double pole switch b) Miniature circuit breaker c) Wiring centre d) Consumer unit. 21) The main reason that any kinks, knots or coils in a cable should be straightened before installation, is because they a) Can cause the cable to become heated in use b) Lead to the use of more cable than is necessary c) Can cause the cable to corrode d) Can cause breakage of the copper wire within the cable. 22) A new electrical circuit installation should be tested a) In a ‘live’ condition to provide a working condition test b) First as a visual inspection with the supply off, then tested with the supply on c) First for earth continuity with the supply on, and then visually inspected d) Before connecting up to the mains supply. 23) Which one of the following tests will establish whether the conductors to a socket outlet have been connected to the correct terminals? a) Polarity test. b) Earth continuity test. c) Insulation resistance test. d) Ring circuit continuity test. 24) Which one of the following tests is carried out to ensure that any exposed metalwork within an installation is not a safety hazard? a) Polarity test. b) Earth continuity test. c) Ring circuit continuity test. d) Insulation resistance test. 25) Which one of the following electrical appliances requires its own separate electrical supply circuit? a) Motorised valve for central heating. b) Room thermostat. c) Domestic shower unit. d) Sink waste disposal unit. 26) It would usually be necessary to advise the customer of the need to isolate the whole house supply in a dwelling when carrying out which of the following? a) Permanently decommissioning an 8 kW electric shower. b) Replacing a central heating pump wired from a fused connection unit. c) Replacing a room thermostat to a heating system. d) Servicing a boiler supplied from a fused connection unit. 27) The procedure to follow before the servicing of a macerator type WC commences, is to turn off the electrical supply at the a) Consumer unit, remove and retain the appropriate fuse and place a warning notice on the consumer unit then check for safe isolation b) Consumer unit, disconnect and tape up the leads to the macerator unit, and place a warning notice on the consumer unit c) Consumer unit, remove and retain the appropriate fuse, place a warning notice on the consumer unit, and disconnect and tape up the leads to the macerator unit d) Appliance control, place a warning notice on the consumer unit, and disconnect and tape up the leads to the macerator unit. 28) The procedure to be followed whilst working on an electric shower, is to isolate the supply at the a) Pull cord switch b) Light switch c) Consumer unit d) Supplier’s main fuse. 29) Cabling used to make temporary continuity earth bonds should have a minimum cross section of a) 2.5 mm² b) 4 mm² c) 6 mm² d) 10 mm². 30) The main connection to an immersion heater should come directly from the a) Fused spur outlet b) Junction box c) Consumer unit d) Ring main.

202 Electrical Principles 1

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