Schwing SP 1800-D, Original Operating Instructions

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2.2.2 Discharge voltage pattern
In the event of a flash over, what is known as a “discharge voltage
pattern” is formed in the vicinity of the machine. The voltage decrea‐
ses from the inside to the outside in this discharge voltage pattern. If
you step inside this discharge voltage pattern, you will bridge different
potentials. This will cause a voltage corresponding to the potential dif‐
ference to flow through your body.
2.2.3 Clearances
Maintain a minimum clearance from highvoltage lines in accordance
with the following table. The minimum clearance is measured in the
horizontal when the placing boom is fully extended.
Rated voltage [V] Minimum clearance [m]
up to 1 kV 1,0
1 kV up to 110 kV 3,0
110 kV up to 220 kV 4,0
220 kV up to 380 kV 5,0
unknown rated voltage 5,0
The specified clearances are minimum requirements. You must ob‐
serve any greater clearances that may be specified in the country of
use.
When you set a minimum clearance, the possibility of the high-volt‐
age lines and the placing boom swaying in the wind must also be tak‐
en into consideration. You should further note that where air humidity
is high, clearances greater than the minimum clearances shown
above are always necessary.
Safety Manual
Concrete delivery and placing machines
32
01/2018 Rev16 EN