Hirschmann OS30 - Electrical Safety and Grounding

6
Installation OS20/OS30
Release 03 06/2015
 Qualification requirements for personnel
 Only allow qualified personnel to work on the device.
Qualified personnel have the following characteristics:
 Qualified personnel are properly trained. Training as well as practical
knowledge and experience make up their qualifications. This is the
prerequisite for grounding and labeling circuits, devices, and systems
in accordance with current standards in safety technology.
 Qualified personnel are aware of the dangers that exist in their work.
 Qualified personnel are familiar with appropriate measures against
these hazards in order to reduce the risk for themselves and others.
 Qualified personnel receive training on a regular basis.
 National and international safety regulations
 Verify that the electrical installation meets local or nationally applicable
safety regulations.
 Grounding the device
The device is grounded via the separate ground screw.
See figure 3 on page 14.
 Use a wire diameter for the ground conductor that is no smaller than
the diameter of the supply voltage connection, however of at least
0.5 mm² (AWG20).
 Ground the device before connecting any other cables.
 Disconnect the grounding only after disconnecting all other cables.
 Shielding ground
The overall shield of a connected shielded twisted-pair cable is connected
to the metal housing as a conductor.
 Beware of possible short circuits when connecting a cable section with
conductive shielding braiding.
 Supply voltage
The devices are designed for operation with safety extra-low voltage.
Connect only SELV circuits with voltage restrictions in line with IEC/EN
60950-1 to the supply voltage connections and signal contacts.
The supply voltage is electrically isolated from the housing.
 Use a power supply cable which is suitable for the voltage, the current
and the physical load.
Hirschmann recommends a wire diameter of 0.5 mm² to 0.75 mm²
(AWG20 to AWG18).