Level 1 Diploma in Electrical Installation © 2014 City and Guilds of London Institute. All rights reserved. 1 of 10 PowerPoint presentation Visual inspection Unit 106: Fabrication techniques for electrical installation

Level 1 Diploma in Electrical Installation © 2014 City and Guilds of London Institute. All rights reserved. 2 of 10 Visual inspection Testing of support systems At this level the testing will be limited to a visual inspection. The senses used are SIGHT and TOUCH. Check that: 1.All lids and covers are in place 2.All fixings are secure 3.All joints are tight 4.All links are in place 5.Paint or other material is intact

Level 1 Diploma in Electrical Installation © 2014 City and Guilds of London Institute. All rights reserved. 3 of 10 Visual inspection Lids and covers To protect the cables and prevent the entry of rodents and insects: All conduit and trunking lids must be in place All screws must be fitted Any unused knockouts must be sealed with blind grommets or blank bushes There should be no more than 2mm gap between lid and fittings

Level 1 Diploma in Electrical Installation © 2014 City and Guilds of London Institute. All rights reserved. 4 of 10 Visual inspection Fixings Make sure all fixings are tightened, including fixings directly into the building fabric and fixtures into brackets. Ensure that conduit is fixed according to Appendix D of the IET onsite guide. Round-head screws should be used for fixing trunking to avoid damage to cables. Where 6mm gutter bolts are used the head should be on the inside of the trunking.

Level 1 Diploma in Electrical Installation © 2014 City and Guilds of London Institute. All rights reserved. 5 of 10 Visual inspection Joints It makes sense that, for the system to be as strong as possible, all joints should be as tight as possible. Where metallic conduit systems are used for the protective conductor, any loose joint will increase the resistance and cause major problems. Any exposed joints must be treated by the use of paint or galvanising treatments as appropriate.

Level 1 Diploma in Electrical Installation © 2014 City and Guilds of London Institute. All rights reserved. 6 of 10 Visual inspection Links Fly leads are required between the earth terminal of a metal box and the accessory it supplies. (A fly lead is a short length of protective conductor.) Links should be fitted across joints in metal trunking to ensure continuity.

Level 1 Diploma in Electrical Installation © 2014 City and Guilds of London Institute. All rights reserved. 7 of 10 Visual inspection Painting Bare metal left exposed to the air will rust Any dirt, swarfe or cutting paste should be totally removed from the conduit or trunking before the appropriate paint finish is applied Black paint for BE conduit Zinc-based paint for galvanised conduit PVC conduit does not need painting

Level 1 Diploma in Electrical Installation © 2014 City and Guilds of London Institute. All rights reserved. 8 of 10 Visual inspection Conduit and trunking QuestionAnswer What senses are used for visual inspection? What coating is used for BE conduit? What can result from loose joints What is the risk of using CSK screws in trunking? What screw size is used to joint metal trunking? What screw sizes can be used to fix conduit saddle in brick? What happens to bare steel? What links a metal box to an accessory?

Level 1 Diploma in Electrical Installation © 2014 City and Guilds of London Institute. All rights reserved. 9 of 10 Visual inspection Conduit and trunking QuestionAnswer What senses are used for visual inspection? Sight and touch What coating is used for BE conduit?Black enamel paint What can result from loose jointsHigh resistance What is the risk of using CSK screws in trunking? Cutting into cables What screw size is used to joint metal trunking? 6mm What screw sizes can be used to fix conduit saddle in brick? 1½ x 8 or 40mm x 4 or suitable alternative What happens to bare steel?Rusts What links a metal box to an accessory?Fly lead

Level 1 Diploma in Electrical Installation © 2014 City and Guilds of London Institute. All rights reserved. 10 of 10 Any questions?