Cables should run horizontally vertically, not diagonally,
down wall.4 and Table the Site Guide).21 shows typical PVC installation. The
cables are generally fixed using plastic clips incorporating masonry nail,
which means the cables can fixed wood, plaster brick with almost
equal ease.3 and Table the Site Guide). identify
the most probable cable routes, Regulation 522.
The necessary skills can acquired electrical trainee who has the
correct attitude and dedication his craft.8.
Where PVC insulated and sheathed cables are concealed walls, floors or
partitions, they must provided with box incorporating earth termi-
nal each outlet position. All joints must accessible for
inspection testing and maintenance when the installation completed
(IEE Regulation 526. 14. also
assuming that the surrounding temperature throughout the length the
circuit does not exceed 30°C and the cables are run singly and clipped to
a surface.3). However, Regulation 522.6 now tells that where
PVC cables are embedded wall partition depth less
than 50mm they should run along one the permitted routes shown
in Fig. Further protection channel conduit only necessary mechani-
cal protection from nails screws required protect them from the
plasterer’s trowel. All kinks should removed that the cable run straight
and neatly between clips fixed equal distances providing adequate sup-
port for the cable that does not become damaged its own weight
(Regulation 522.
PVC insulated and sheathed cable installations
PVC insulated and sheathed wiring systems are used extensively for light-
ing and socket installations domestic dwellings. Table the IEE
On Site Guide shown Table 14. PVC cables not react chemically with plaster,
as some cables, and consequently PVC cables may buried under plas-
ter.22.
Wiring systems and enclosures
The final choice wiring system must rest with those designing the
installation and those ordering the work, but whatever system employed,
good workmanship competent persons and the use proper materials
is essential for compliance with the Regulations (IEE Regulation 134.6. Where cables are bent, the radius
of the bend should not cause the conductors damaged (Regulation
522.5.6 tells that outside a
zone formed 150mm border all around wall edge, cables can only be
. Mechanical damage to
the cable caused impact, abrasion, penetration, compression ten-
sion must minimized during installation (Regulation 522.1. Figure 14.1).6.1).6.
Terminations joints the cable may made ceiling roses, junction
boxes, behind sockets switches, provided that they are enclosed a
non-ignitable material, are properly insulated and are mechanically and
electrically secure (IEE Regulation 526).Electrical installations and wiring systems
303
thermosetting cable with LSF (low smoke and fume properties).8
