Method of Installation Cables

Installation Method

Examples

Appropriate Reference Method for determining current-carrying capacities

Number

Description

 

1

2

3 4

Open and clipped direct:

1

Sheathed cables clipped direct to or lying on non-metallic surface

Method 1

In conduit :

3

Single-core non-sheathed
cables in metallic or nonmetallic
conduit on
a wall or ceiling

Method 3

5

Multicore cables having
non-metallic sheath, in
metallic or non-metallic
conduit on a wall or
ceiling

Method 3

In trunking :

8

Cables in trunking on a
wall or suspended in air

Method 3

9

Cables in flush floor trunking

Method 3

10

Single-core cables in
skirting trunking

Method 3

On trays

11

Sheathed cables on a Method 11
perforated cable tray,
bunched and unenclosed.
A perforated cable tray is
considered as a tray in
which the holes occupy at
least 30 % of the surface
area.
Method 11

 

12 Sheathed single-core
cables in free air (any
supporting metal work
under the cables
occupying less than 10%
of the plan area):

Two or three cables
vertically one above the
other, distance between
cables equal to the overall
cable diameter (De);
distance from the wall not
less than 0.5 (De)

Two or three cables
horizontally, with
spacing as above

Three cables in trefoll,
distance between wall
and surface of nearest
cable 0.5 De or nearest
cables 0.75 De

Method 12
13 Sheathed multicore
cables in free air
distance between wall
and cable surface not
less than 0.3 De
(any supporting
metalwork occupying less
than 10 % of the plan area)

Method 13
     
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