Level 1 Diploma in Electrical Installation © 2014 City and Guilds of London Institute. All rights reserved. 1 of 7 PowerPoint presentation Electrical materials.

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Level 1 Diploma in Electrical Installation © 2014 City and Guilds of London Institute. All rights reserved. 1 of 7 PowerPoint presentation Electrical materials and components 2 Unit 105: Electrical installation wiring and terminations

Level 1 Diploma in Electrical Installation © 2014 City and Guilds of London Institute. All rights reserved. 2 of 7 Electrical materials and components Flex Flexible cables are those in which the conductor is multi-stranded with very fine wire. This makes the cable very flexible, enabling it to absorb vibration and movement. There are many types of flexible cable: Two- and three-core PVC flex (used for lighting pendants and fixed equipment) High-temperature flex (used for heating equipment such as immersion heaters) External, or arctic, flex (used on building sites etc)

Level 1 Diploma in Electrical Installation © 2014 City and Guilds of London Institute. All rights reserved. 3 of 7 Electrical materials and components Ceiling Rose A ceiling rose is fixed to the ceiling by woodscrews or plaster board fixings Lamp holder These may be bayonet cap (BC) or Edison screw (ES). Bi-pin holders used in some fittings are usually pre-wired. The ceiling rose, flex and lampholder combination are known as a pendant.

Level 1 Diploma in Electrical Installation © 2014 City and Guilds of London Institute. All rights reserved. 4 of 7 Electrical materials and components 13A plug So called because the maximum load it can take is 13A This is limited by the internal fuse Other lower-rated fuses are available The plug has rectangular pins and cannot be inserted in any other size socket

Level 1 Diploma in Electrical Installation © 2014 City and Guilds of London Institute. All rights reserved. 5 of 7 Electrical materials and components Complete the table: ApplianceCurrent demand 2kW kettle Electric clock TV Table lamp Washing machine Refrigerator DVD player Vacuum cleaner

Level 1 Diploma in Electrical Installation © 2014 City and Guilds of London Institute. All rights reserved. 6 of 7 Electrical materials and components Complete the table: ApplianceCurrent demand 2kW kettle8.7A – 13A fuse Electric clock0.1A – 3A fuse TV1-2A – 3A fuse Table lamp0.25A – 3A fuse Washing machine10A – 13A RefrigeratorVaries on size – 13A DVD playerNegligible – 3A Vacuum cleaner750w (3.5A approx) – 13A

Level 1 Diploma in Electrical Installation © 2014 City and Guilds of London Institute. All rights reserved. 7 of 7 Any questions?