Code of Practice for the Electricity (Wiring) Regulations - 2009 Edition

Table 25(2)
Spacing of Supports for Cable Trunking (Steel or Plastic or PVC)
Cross-sectional Area of
Trunking (mm
0
0
0
0
0
0
0
0
0
2 Maximum Distance between Support (Metres)
)
Steel Trunking Plastic/PVC Trunking
Horizontal Vertical Horizontal Vertical
Exceeding 300 but not exceeding
700
0.75 1.0 0.5 0.5
Exceeding 700 but not exceeding
1 500
1.25 1.5 0.5 0.5
Exceeding 1 500 but not exceeding
2 500
1.75 2.0 1.25 1.25
Exceeding 2 500 but not exceeding
5 000
3.0
3.0 1.5 2.0
Exceeding 5 000
3.0
3.0 1.75 2.0
Notes: (1) The spacings tabulated above assume that the trunking is not exposed to
mechanical stress other than that due to the weight of the enclosed cables, the
trunking and fittings.
(2) The above figures do not apply to trunking which is used for supporting lighting
fittings or other equipment.
Overall diameter
of cable‡
(mm)
Not exceeding 9
Exceeding 9 but
not exceeding 15
Exceeding 15 but
not exceeding 20
Exceeding 20 but
not exceeding 40
Table 25(3)
Spacing of Supports for Cables in Accessible Positions
0.4 0
Maximum spacing of clips (Metres)
Non-armoured rubber,
PVC or lead-sheathed
cables
Armoured cables
Mineral insulated
copper sheathed or
aluminium sheathed
cables
Horizontal† Vertical† Horizontal† Vertical† Horizontal† Vertical†
0.25 0.4 0 — — 0.6 0.8
0.3 0 0.4 0 0.35 0.45 0.9 1.2
0.35
0.45
0.55
0.4 0
0.45
0.55
0.6 0
NOTE— For the spacing of supports for cables of overall diameter exceeding 40 mm, and for
single-core cables having conductors of cross-sectional area 300 mm 2 and larger, the
manufacturer’s recommendations should be applied.
‡ For flat cables taken as the measurement of the major axis.
† The spacings stated for horizontal runs may be applied also to runs at an angle of more than
30° from the vertical. For runs at an angle of 30° or less from the vertical, the vertical spacings
are applicable.
164
1.5
—
2.0
—