Basics
Class of protection
Protective earth ground
(PE)
Electrical isolation
Installation altitude
According to DIN VDE 0106 Part 1, electrical equipment (including power supply units) is
divided into the classes of protection 0, I, II and III. Devices with class of protection 0 are
not permitted in Germany.
Compact power supply units are usually designed to meet class of protection I or II.
The classes of protection each relate to the single device. To guarantee the safety of the
entire system, all the wiring required must be implemented by trained personnel as defined
in the current VDE guidelines and DIN standards.
Devices with Class of Protection I
For devices with class of protection I protection against electric shock is not only based on
the basic insulation. In addition, parts are connected to the protective conductor of the
permanent installation in such a way that no voltage can remain even if the basic insulation
fails. These devices are always provided with a protective earth ground connection (PE).
QUINT POWER power supply units correspond to class of protection I. These units are
usually grounded using the PE connection on the input terminal. The power supply unit is
electrically connected to the mounting rail via the mounting rail adapter. PE connection via
the terminal point is not required if the mounting rail is grounded.
Devices with Class of Protection II
For devices with class of protection II protection against electric shock is not only based on
the basic insulation. In addition, a double or reinforced insulation is used. There is no
possibility for connecting a protective conductor for these devices. With regard to safety
the device is therefore independent of installation conditions.
Due to their good insulation concept and the non-conductive housing, MINI POWER and
STEP POWER power supply units from Phoenix Contact do not require any protective
conductor. Class of protection II is obtained when the unit is installed in a closed control
cabinet.
A further requirement for the professional use of a power supply unit is electrical isolation.
It is essentially determined by the insulation, the transformer and a suitable closed-loop
control circuit. For power supply units with electrical isolation there is no continuous
conductive connection from the device input to the device output.
When designing the insulation, it is the task of the manufacturer to select a suitable
insulating material and to provide clearances that are large enough. Besides other
parameters the insulation voltage and the maximum installation altitude of the devices
depend on the choice of insulation clearances.
Power supply units designed according to DIN VDE 0110 Part 1 are suitable for installation
altitudes up to 2000 m (6562 ft.) above sea level, minimum.
5598_en_03
PHOENIX CONTACT
2-5
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