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Sample Paper Two C&G 2382-12 One 1) The fundamental principles of BS7671 state that persons and livestock shall be protected against injury as a consequence of overvoltages originating from a) motors running b) the operation of circuit breakers c) atmospheric events d) voltage recovery two 2. Band II voltages exceed: a. 2500Vdc between live conductors b. 2500Vdc between conductors and earth c. 1000Vac rms d. 120Vdc ripple free 3. A protective conductor connecting exposed conductive parts of equipment to the main earthing terminal is known as the: a. earthing conductor b. main bonding conductor c. circuit protective conductor d. bonding conductor three 4) Installations should be arranged so as to avoid danger in the event of a fault and to facilitate safe operation, inspection, testing and maintainance. One method of complying with this is to a) connect all circuits on the single spur principle b) connect all circuits on the radial principle c) divide the installation into bands of circuits d) connect all circuits on the ring principle 5) The information to be given to the local Electricity Supplier in order to establish the type and rating of the supply, prior to the construction of a new electrical installation is the a) maximum demand b) frequency and nature of current c) nominal voltage d) external impedance 6) Which of the following does not fall under compatibility a) leakage of current b) unbalanced loads c) d.c. feedback d) external influences 7) Diversity and maximum demand should be determined before beginning an installation a) for a reliable and cost effective design b) because the customer must be provided with the information c) in order that the correct supply rating is used d) as it is an REC requirement 8) When assessing the general characteristics of a circuit that needs a "continuity of service" one of the characteristics to be considered is a) selection of the system earthing b) number of conductors c) how often it is used d) where to install the isolator four 9) An electric shock due to inadequate fault protection can only be caused by a) accidental touching of a phase conductor b) class II equipment c) touching conduit under fault conditions d) SELV terminals 10) An electric shock due to inadequate basic protection can be caused by a) touching the case of a class II portable drill b) brushing a phase conductor with your hand c) the circuit protective conductor being touched under energisation d) a person touching conduit under fault conditions 11) What is the maximum Zs for a 10A type C circuit breaker protecting a standard discharge type lighting circuit a) 1.15Ω b) 2.30Ω c) 1.44Ω d) 1.92Ω 12) When considering the installation of a large three-phase a.c. motor, additional protection should be made against a) basic contact b) high earth fault leakages c) installation overvoltages d) installation undervoltages 13) The maximum disconnection time for a 230v a.c. final circuit not exceeding 32A, with a TT supply is a) 3s b) 0.2s c) 0.5s d) 5ms 14) The minimum distance between information technology cables and a discharge lights shall be a) 300mm b) 180mm c) 130mm d) 100mm 15) The maximum Zs for a 16A Type B circuit breaker protecting a fixed appliance is a) 1.87Ω b) 0.87Ω c) 2.4Ω d) 2.87Ω 16) In a TT installation, distribution circuits must satisfy a disconnection time of a) 4s b) 1s c) 0.5s d) 0.2s 17) In domestic installations where circuits are protected by RCD's, the product of the earth fault loop impedance and the rated residual operating current of the device must not exceed a) 20v b) 50v c) 110v d) 120v 18) In a TN system, the maximum earth fault loop impedance Zs when using a 32A, type B circuit breaker for instantaneous operation would be a) 1.15 ohms b) 1.09 ohms c) 1.44 ohms d) 0.72 ohms 19) If a fault occurs in the HV system and a magnitude of fault voltage of 430v occurs between exposed conductive parts and earth on the LV installation, what is the maximum tolerable duration of the fault a) 10ms b) 100ms c) 200ms d) 300ms 20) If a line conductor of an IT system is accidentally, the insulation and components rated for the line to neutral voltage can be temporarily stressed with a higher voltage. What value can this stress voltage reach up to a) U=√3 UO b) U=3 UO c) U=√ UO d) U=UO 21) In a high rise building, lightning conductors must be bonded to the a) earth electrode b) structural steelwork c) main incoming services d) protective installation bonding 22) Which of the following does not give protection against basic contact a) barrier or enclosure b) obstacles c) insulation of live parts d) supplementary bonding five 23) Where a clamp is used for bonding purposes, a permanent label shall be fixed in a visible position with the wording a) danger electrical connection-do not remove b) danger electrical connection-do not remove c) safety earth connection-do not remove d) safety electrical connection-do not remove 24) An installation protected by an RCD shall have a fixed notice stating a) the test button should be pressed occasionally b) the test button should be pressed monthly c) the test button should be pressed quarterly d) the test button should be pressed at 6 monthly intervals 25) When insulated a PEN conductor shall be identified with a) blue insulation along its length b) green insulation and blue markings at the termination c) green and yellow insulation and blue markings at the termination d) green and yellow insulation along its length 26) An insulated monitoring device (IMD) installed in a location where unskilled personnel have access shall be designed or installed in such a way that it a) will indicate any important increase of the insulation level of the system b) is possible to modify the settings, without the use of a key or a tool or a password c) shall not be possible to modify the settings, without the use of a key or a tool or a password d) is set to a higher value corresponding to the normal insulation of the system 27) The metallic pipe of a water utility supply shall not be used as an earth electrode. Other metallic water supply pipe work may be used as an earth electrode if it has been considered for such a use, and a) it is adequately buried in the ground b) precautions are taken against its removal c) is protected against mechanical damage d) is adequately lagged 28) In Great Britain the use of combined protective neutral (PEN) conductors is prohibited in consumers installations by which regulation a) the electricity at work regulations 1989 b) the supply of machinery (safety) regulations 1992 c) the IEE wiring regulations d) the electricity safety, quality and continuity regulations 2002 six 29) An electrical installation certificate should be signed by a) the customer b) the local authority c) the REC d) a competent person 30) On a 230v a.c. installation, the minimum value of insulation resistance is a) 10.0MΩ b) 2.0MΩ c) 1.0MΩ d) 0.5MΩ 31) The paperwork that should be issued on completion of a new installation is a) a fully completed test sheet b) an NICEIC test results sheet c) a periodic inspection report d) a schedule of test results, schedule of inspection and an electrical installation certificate 32) An insulation resistance test is carried out to verify a) fuse rating is correctly calculated b) there is sufficiently low resistance to operate the protective device within its limits c) there is sufficient circuit protection d) there is no breakdown of the conductor insulation 33) An electrical installation certificate must indicate responsibility for the installation's a) materials, design and construction b) design, inspection and testing c) design, construction, inspection and testing d) technical drawings and plans 34) The minimum value of insulation resistance of a 230v lighting circuit is a) 0.5MΩ b) 1 MΩ c) 1.5MΩ d) 5 MΩ 35) The test voltage for carrying out an insulation test on a PELV system is a) 100v b) 250v c) 500v d) 1000v seven 36) Final circuits exceeding 32A, not supplying socket outlets, in agricultural premises, should be protected by a) A 100mA RCD b) A 300mA RCD c) A 500mA RCD d) A 10mA RCD 37) Socket outlets installed in an area containing a bathtub or shower must be installed a) within zone 2 but outside zone 0 b) 3m horizontally from zone 1 c) 3m horizontally from zone 2 d) 3m horizontally from zone 0 38) Taking into account the presence of water, electrical installations installed outside in caravan park shall have minimum IP rating of a) IP5X b) IPX4 c) IP3X d) IPX2 39) Self supported suspension cables within agricultural situations should be a) at a height of at least 2M b) at a height of at least 4M c) at a height of at least 6M d) at a height of at least 10M 40) Special locations do not include a) new buildings b) earthworks c) engineering works d) surface mining 41) Additional protection in a room containing a sauna would be a) barriers b) placing out of reach c) IPX6 rated accessories d) by way of RCD 42) The specific IP rating for areas within zone 1 of a bathroom is a) IPXXB b) IP2X c) IPX7 d) IPX4 43) In a bathroom zone 0 is defined as the a) area outside a 0.60m circumference from the bath or shower b) area within a 0.60m circumference from the bath or shower c) area directly above the bath or shower up to 2.25m above the finished floor level d) area within the bath or shower 44) Cables used for supplying reduced low voltage systems on a building site must be insulated to a) 230V b) 250V c) 230/400V d) 450/750V 45) Circuits within booths at fairground premises should be protected at the origin of the installation by at least a a) 500mA RCD b) 300mA RCD c) 100mA RCD d) 10mA RCD 46) In marina installations that are in an area subject to vehicle movement, overhead distribution cables shall be installed at a height of a) 5m b) 7m c) 6m d) 8m 47) Socket outlets supplying caravan pitches should be to a) BS 60309-2 and IP65 rated b) BS 60309-2 and IP44 rated c) BS 61009-2 and IP44 rated d) BS 61009-2 and IPX4 rated 48) Socket outlets supplying caravan pitches should be at a height of a) 0.5m off the ground b) 0.25m off the ground c) 0.5m to 1.5m off the ground measured to the highest part of the socket outlet d) 0.5m to 1.5m off the ground measured to the lowest part of the socket outlet appendices 49) When designing a single circuit, correction factors are to be used and applied to the a) design current of the circuit b) nominal rating of the protective device c) maximum demand of the installation d) current carrying capacity of the cable 50) When determining design current, the correction factor that is applied to a BS3036 rewirable fuse is a) 0.752 b) 0.527 c) 0.725 d) 1.725 51) A BS3036 protective device is also known as a a) circuit breaker b) cartridge fuse c) RCBO d) semi enclosed rewirable fuse 52) The correction factor for cables installed in free air with 70oC thermosetting insulation and an ambient temperature of 50oC is a) 0.71 b) 0.17 c) 0.58 d) 0.77 53) In a TN-C-S dc system, the mid-point conductor is identified by the symbol a) L+ b) M c) N d) L54) BS EN 60228 relates to a) conduit systems b) conductors of insulated cables c) cable trunking and ducting systems d) industrial plugs, couplers and socket outlets 55) When considering external influences, the code AD3 requires IP rated equipment to a) IPX0 b) IPX1 c) IPX2 d) IPX3 oddities 56) A BS1361 protective device is also known as a a) circuit breaker b) cartridge fuse c) RCD d) semi enclosed rewirable fuse 57) A BS EN 60898 protective device is also known as a a) circuit breaker b) cartridge fuse c) RCD d) semi-enclosed rewirable fuse 58) Copper cored data communication cables are made up of twisted pairs in order to a) reduce manufacturing costs b) speed the manufacturing process c) reduce interference d) increase core capacity 59) Nuisance tripping from a large transformer installation can be prevented by a) the use of an RCD b) the use of a C Type MCB c) the use of a B Type MCB d) the use of a D Type MCB 60) A residual current device works by a) a magnetic device operating in the event of a fault between line and earth b) a magnetic device operating in the event of a fault between neutral and line c) a thin element operating in the event of a fault between neutral and earth d) a thin element operating in the event of a fault between live and earth 61) A Residual Current Device offers protection against a) basic contact b) overload current c) earth fault current d) short circuit current 62) If Ze is measured at 0.68Ω and R1+R2 is measured at 0.82Ω, the value of Zs would be a) 2.88Ω b) 0.18Ω c) 1.5Ω d) 0.5Ω