6.1).2.5),
as shown Fig.
Where cables pass through walls, floors and ceilings the hole should be
made good with incombustible material such mortar plaster pre-
vent the spread fire (Regulations 527.
.
Where none this protection can complied with and the installation
is used ordinary people, then the cable must given additional
protection with 30mA RCD (IEE Regulation 522.2 and 527.22.Basic Electrical Installation Work
304
run horizontally vertically point accessory unless they are con-
tained substantial earthed enclosure, such conduit, which can
withstand nail penetration, shown Fig. Adapted from the IEE Site Guide Kind Permission the Institution of
Electrical Engineers
Spacings supports for cables accessible positions
Overall
diameter of
cable* (mm)
Maximum spacings clips
Non-armoured thermosetting, thermoplastic lead
sheathed cables
Armoured cables Mineral insulated copper
sheathed aluminium
sheathed cables
Generally caravans
Horizontal**
(mm)
Vertical**
(mm)
Horizontal**
(mm)
Vertical**
(mm)
Horizontal**
(mm)
Vertical**
(mm)
Horizontal**
(mm)
Vertical**
(mm)
1 9
Not
exceeding 9
250 400 600 800
Exceeding
9 and not
exceeding 15
300 400 250 (for all
sizes)
400 (for
all sizes)
350 450 900 1200
Exceeding
15 and not
exceeding 20
350 450 400 550 1500 2000
Exceeding
20 and not
exceeding 40
400 550 450 600 –
Note: For the spacing supports for cables having overall diameter exceeding 40mm, and for single-core cables having conductors of
cross-sectional area 300mm2
and larger, the manufacturer’s recommendations should observed.6.
Where the accessory cable fixed wall which less than 100mm
thick, protection must also extended the reverse side the wall a
position can determined.7).5 Spacing Cable Supports. Holes drilled floor joists through which cables are
run should 50mm below the top 50mm above the bottom the joist
to prevent damage the cable nail penetration (Regulation 522. 14. PVC cables should not installed when the
surrounding temperature below 0°C when the cable temperature
Table 14.23.1. Cables passing
through metal boxes should bushed with rubber grommet prevent
abrasion the cable. For runs angle of
30° less from the vertical, the vertical spacings are applicable. 14.
**
The spacings stated for horizontal runs may applied also runs angle more than from the vertical.
*
For flat cables taken the dimension the major axis
