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Low-voltage insulated<br />
Double insulated<br />
A<br />
C<br />
B<br />
VDE 0682-742 certified<br />
<strong>Versalift</strong> aerial access platforms are<br />
low-voltage insulated, certified to standard<br />
VDE 0682-742 published by the DKE (the<br />
German Electro-technical Commission).<br />
They are thereby rated to sustain alternating<br />
currents up to 1000 V at up to 60 Hz<br />
and direct currents up to 1500 V.<br />
Two independent insulating sections<br />
<strong>Versalift</strong> aerial access platforms are insulated<br />
by two insulating sections that are<br />
independent of each other.<br />
The first insulating section insulates the<br />
cage from the extending structure, while<br />
the second insulates the extending structure<br />
from the vehicle. The VDE 0682-742<br />
requires that access platforms intended<br />
for use on free-hanging overhead lines and<br />
lines for electric railways are provided with<br />
an insulating section between the extending<br />
structure and the vehicle. The insulators<br />
are primarily fiberglass bushings at boom<br />
pivots and synthetic bricks at non-moving<br />
points but other parts, such as non-conductive<br />
hoses in the booms, also play a role.<br />
Fail-safe system<br />
The requirement of the VDE 0682-742<br />
for two independent insulating sections<br />
ensures redundancy and a high level of<br />
safety. Should one insulating section for<br />
some reason fail, the second insulating<br />
section will give full protection to persons<br />
on the platform.<br />
To maintain the insulating rating of an access<br />
platform, periodic testing is required<br />
at least annually and whenever maintenance<br />
or repair work may have undermined<br />
the insulating properties of the machine.<br />
The periodic/extraordinary testing must<br />
conform to VDE 0682-742.<br />
Insulation sections<br />
On the image above, “A” highlights the<br />
first insulating section while “B” and “C”<br />
highlight the second.<br />
(A) Insulation between the cage and<br />
the end of the extending structure<br />
(B) Insulation between the turret and<br />
the extending structure (outer boom)<br />
(C) Insulation between the turret and<br />
the extending structure (outer boom<br />
cylinder)<br />
<strong>Chassis</strong> <strong>mounted</strong> <strong>Aerial</strong> <strong>Access</strong> <strong>Platforms</strong> A TIME saving product | 33
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