27.
METALLIC TRUNKING
Metallic trunking formed from mild steel sheet, coated with grey or
silver enamel paint for internal use hot-dipped galvanized coating
where damp conditions might encountered and made specifica-
tion defined 500 85. Trunking may thought more accessible conduit system and
for industrial and commercial installations replacing the larger con-
duit sizes. Trunking may thought a
more accessible conduit system. wide range accessories available, such
as 45° bends, 90° bends, tee and four-way junctions, for speedy on-site
assembly. Alternatively, bends may fabricated lengths trunking, as
shown Fig. 14. Most trunking available in
either steel plastic.
. The new wiring can then drawn through the new
conduit and the existing trunking the supply point. trunking system can have great flexibility when used con-
junction with conduit; the trunking forms the background framework
for the installation, with conduits running from the trunking the point
controlling the current-using apparatus.27
Alternative trunking bends.
Definition
Metallic trunking formed from mild
steel sheet, coated with grey sil-
ver enamel paint for internal use or
a hot-dipped galvanized coating
where damp conditions might be
encountered.Electrical installations and wiring systems
311
Trunking installations
A trunking enclosure provided for the protection cables which is
normally square rectangular cross-section, having one removable
side. This may necessary more convenient bend
or set non-standard, but does take more time fabricate bends than
merely bolt standard accessories.
Trunking supplied lengths and various cross-sections measured
in millimetres from 300 150.
Definition
A trunking enclosure provided
for the protection cables which
is normally square rectangular in
cross-section, having one removable
side.
Standard accessory
90° bend
Fabricated 90°
bend
Copper earth
strip
Fishplate
FIGURE 14. When alteration extension
is required easy drill hole the side the trunking and run con-
duit the new point
