Traffic Signs Manual Chapter 4 Warning Signs

above road Height of gauge (diagram 781) and height to be shown

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traffic-signs-manual-chapter-4

above road
Height of gauge (diagram 781) and height to be shown
on supplementary plate for different overhead line
voltages
Signs to be used
25000 volts
Less than 25000 volts
Imperial
Metric
Imperial
Metric
Imperial
Metric
18′-9″
5.71 m
16′-9″
5.1 m
17′-3″
5.2 m
Diagram 779 with
Figure 20-12
and
Figure 20-13
18′-6″
5.64 m
16′-6″
5.0 m
17′-0″
5.1 m
18′-3″
5.56 m
‑
‑
16′-9″
5.1 m
18′-0″
5.49 m
‑
‑
16′-6″
5.0 m
18′-3″
5.56 m
16′-6″
5.0 m
‑
‑
Load gauge
(diagram 781) and
diagram 779 with
Figure 20-14
18′-0″
5.49 m
16′-3″
4.9 m
‑
‑
17′-9″
5.41 m
16′-0″
4.8 m
16′-6″
5.0 m
17′-6″
5.33 m
15′-9″
4.8 m
16′-3″
4.9 m
17′-3″
5.26 m
15′-6″
4.7 m
16′-0″
4.8 m
17′-0″
5.18 m
15′-3″
4.6 m
15′-9″
4.8 m
16′-9″
5.10 m
15′-0″
4.5 m
15′-6″
4.7 m
16′-6″
5.03 m
14′-9″
4.5 m
15′-3″
4.6 m
Load gauge
20.2.4. The load gauge shown in diagram 781 (see
Figure 20-14
) gives an audible warning
when the safe height beneath an overhead power cable is exceeded. The number of the bells
may be varied. The bells may be of any colour provided each bell is of the same colour. It
should always be used where the safe height is less than 16’‑6” (5.03 m); see also
20.3.2
.
A safe height less than 16’‑6” is likely to be encountered only at private crossings. At such
locations the gauge should be effective as speeds are low and users are familiar with the layout.
The gauge is for use with power cables and not at low bridges over public highways, where
speeds are likely to be higher and drivers less able to respond to the sound of the bells in time,
or even to hear them at all from inside closed cabs.
20.2.5. The load gauge must be mounted on two posts coloured black and white in alternate
horizontal bands, each band being not less than 250 mm nor more than 335 mm deep.

80
LEVEL CROSSINGS
Diagram 779 (see
Figure 20-11
) with the supplementary plate shown in
Figure 20-14
should be
used when a load gauge is installed.
BELLS
Figure 20-15 Diagram 781 (S2‑6‑5) Load gauge giving audible warning to drivers
where vehicles exceed safe height under electrified overhead cables

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