(3, 4) Looping method of wiring, Flat TPS wiring

Why is the wiring of a lighting circuit in TPS more complex than wiring of a socket-outlet circuit?

Lighting circuit consists of loop wiring as well as switch wiring. Socket-outlets circuits consist of just loop wiring looped from one outlet to the next

What would the wiring diagram w/ looping at light accompanying this circuit diagram look like?

In TPS Looping, when would looping at the switch be preferable to looping at the light? When shouldn’t it be used?

1. Minimal space at light fitting, instead of using junction box at each fitting can loop at switch instead and junction boxes

2. Supplying outdoor lights fittings, cable to switch > light means short circuit if fitting damaged can be left dead if switch off and circuit can still run

Shouldn’t be used on architrave switches; too small

What would the wiring diagram w/ looping at switch accompanying this circuit diagram look like?

How can a TPS cable lose its double insulated classification, and how can it be restored?

Occurs when sheath is stripped, exposing basic insulation. Can be fixed by re-sheathing or enclosing in suitable wiring enclosure

In building terms, what is a slab, pillar, suspended ceiling?

Slab: Horizontal structural component used to provide flat surface for floors
Pillar: Any isolated, vertical structural member such as pier, column, post
Suspended ceiling: Installed as false ceiling below main foundation, works to lower ceiling height to hide electrical+insulation+plumbing services

In building terms, what is a cement render?

Application of mortar mix of sand, cement and water to brick, concrete, stone, mud brick

What is segregation, where might it be used, and how is it enforced?

Separation of cables by barrier. May be required to separate cables of different voltage levels, telecomms cables from electrical cables, cables supplying different units in housing complex. Enforced by use of separate wiring enclosures and/or distances greater than 50mm

What’s the difference between cable trunking and cable duct?

Cable trunking usually has removable/replaceable lid to install cables. Cable ducting is closed passage, cables must be drawn into.

How is a short circuit test conducted?

After removing all resistors/loads from circuit, put multimeter leads set to continuity on ends to be tested. If closed circuit is detected, there is a short circuit. (cable/s going directly from live to neutral)

How is an earth continuity test conducted?

Put multimeter leads set to continuity onto the switchboard earth and the next furthest earth point. If closed circuit is detected, earth has continuity.

How is an insulation resistance test conducted?

Put IR tester leads onto live and neutral terminals. If OL (open line) is detected, insulation is maintained higher than the value set to on the device. Min. 1MΩ accepted.

How is a polarity test conducted?

Connect your multimeter leads to the terminals to be tested. If a reading other than the fixed resistance is read, the correct polarity is wrong.

How is a voltage test conducted?

After setting multimeter to the correct setting, connect leads to the terminals to be tested. 

In skirting trunking, what compartment is for low voltage power cables?

Bottom, in all cases/numbers of compartments

What is the difference between a floor duct and a riser duct?

Floor duct set into floor space, riser duct used to protect cables running vertically to different floors.