1) Which two types of cable sheathing are no longer used? a) Lead sheathed cable b) PVC Twin & CPC c) PVC Twin and Earth d) Vulcanised rubber cables 2) Why is lead sheathed cable no longer used? a) Lead is a soft metal which reacts to changes in temperature b) Lead is a rare metal and must be preserved c) Lead is very heavy and can cause injury during manual handling d) Temperature movement leads to cracking, allowing moisture to enter the sheathing. 3) You are involved in refurbishing an old heritage property. What types of fuses might you find in the consumer unit? a) Rewireable fuses b) Semi-enclosed, BS3036 c) BSEN 61009 d) BSEN 60898 4) You attend a house with a Plastic Clad consumer unit. Explain to the customer why this is now considered substandard. a) They cannot be earthed and therefore are not safe b) They cannot contain fires, however caused c) Required labelling will not stick to plastic d) They are susceptible to mechanical damage 5) What is this? a) Steel trunking b) Steel conduit c) Steel tray d) Steel basket

(13a) Cables and equipment in older electrical installations

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