preview

Btec Level 3 Unit 1 P1

Satisfactory Essays
Open Document

Task 1 (P1,P2) 1. One-Way Lighting Circuit Components: 1 Gang Switch 6A Circuit Breaker Ceiling Rose/ Patress 1.0/1.5mm2 Line Conductor 1.0/1.5mm2 Neutral Conductor 1.0/1.5mm2 CPC One Way Lighting Circuits are generally used in either rooms with a single entrance/exit, or for outside lights. Two-Way Lighting Circuit Components: 1 Gang Switch x2 6A Circuit Breaker Ceiling Rose/ Patress 1.0/1.5mm2 Line Conductor 1.0/1.5mm2 Neutral Conductor 1.0/1.5mm2 CPC 1.0/1.5mm2 Strappers Two Way Lighting Circuits are generally used in hallways and stairwells/landings, where lights may need to be switched on from either end, or from the top and bottom. 2. Generally 1.0mm2 cable is sufficient for a lighting circuit but there are cases …show more content…

They are most commonly protected by a 32A fuse and wired with 2.5mm2 cable. They are designed to act like two radial circuits joined together at their end point, this splits the current and puts less load on the cables. This circuits purpose is to enable the use of wires of a smaller cross sectional area than those used in a radial circuit. However, in practice this is not always possible as the load is not always evenly split in two directions. This can also effectively double the amount of cable used in comparison to a radial …show more content…

Within bathrooms all low voltage circuits must be protected by 30mA RCDs, all circuits require supplementary bonding, and equipment, wiring and accessories respective requirements change depending on the different zones: Zone 0 - Inside a bath or shower, fittings must be SELV and min IPX7 Zone 1 - Directly above a bath or shower to a height of 2.25m, fittings must be IPX4 min or IPX5 min if water jets Zone 2 - 0.6m above and outside a bath or shower, fittings must be IPX4 min or IPX5 min if water jets Zone 3 – Anywhere outside the other three zones and where no water jets are likely to be used, fittings should be IPXXB or IP2X min unless water jets could be used for cleaning purposes in zones 1, 2 and 3, then must be IPX5 min. 2. Extractor fans are allowed in zones 1, 2 and 3, however if in zones 1 and/or 2 must be IPX4 minimum or IPX5 minimum if water jets are used in the area. If a fan is installed in a windowless room and supplied from the lighting circuit, it should have its own isolation switch to avoid having to perform maintenance in the dark. The isolation switch should not be installed in zones 0, 1 or 2. 3. In order to be fitted in a bathroom, a shaver socket must comply with BS EN 61558-2-5 and must also be fitted in a place where direct contact with spray is not

Get Access
Related
Get Access