Safety Distance To Underground Power Lines/Water Supply - XCMG XE17U Instruction Manual

2.6

Safety distance to underground power lines/water supply

 Start working only after explicit approval or confirmation of the shutoff of the underground power
supply lines by the responsible authority.
 Treat the underground power lines as live until shutoff has been confirmed in writing by the
responsible authority.
 Pay attention to distances between underground supply lines and working position.
 If necessary, consult a second person for observation.
 Break off if in doubt.
Warning
 Electrical energy and fire hazard!
 Coming into contact with a direct or an indirect current flow caused by a voltage flash-
Observe the following safety notes:
- Start working only after explicit approval or confirmation of the shutoff of
the overhead power lines by the responsible authority.
- Treat the overhead power lines as live until shutoff has been confirmed in writing
by the responsible authority.
- Pay attention to distances between overhead lines and spray beam.
- If necessary, consult a second person for observation.
- Break off if in doubt.
 Examples of hydraulic energy:
- Coming into direct contact with an overhead power line.
- If the safety distance is not maintained, an arc will form.
- An overhead power line comes down and a dangerous resistance area
forms in the ground around it.
The safety machines of the different national electricity grids react differently in the event of a
fault. One may not assume that the overhead power lines will be automatically and
permanently shut down after a short to earth. A resistance area develops around the machine
and/or the damaged overhead power lines
The necessary safety distance depends on the rated main voltage of the power lines.
- Safety distances to overhead power lines are listed exemplary in ISO 12480-1 and
OSHA Part 1926.
- These are benchmark values.
- The respective nationally prescribed safety distances must be observed.
- Exact information on nominal line voltage is provided by the power supply company.
Safety distances "X" : ISO 12480-1 Cranes - Safe use
(B) Low Voltage :
(B) Medium Voltage: Safe Distance X = 3000 mm
(A) High Voltage:
Safety distances "X": USA- Occupational Safety and Health Administration
Nominal line voltage:
09.2020
over or step voltage can be fatal.
X = 6000 mm
OSHA Part 1926. 1408 and 1926. 1409)
up to 350 kV
above 350 kV
Low Voltage
High Voltage
=> Safe distance X = 6100 mm
X = 15250 mm
Voltage
100V,200V
6.6 KV
Minimum Safe Distance
2.0m
2.0m
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