10
Installation RSP20/25/30/35
Release 18 09/2021
Requirements for connecting the supply voltage
Device variant
Requirements
All variants
All
of the following requirements are complied with:
The supply voltage corresponds to the voltage specified on the type
plate of the device.
The power supply conforms to overvoltage category I or II.
The power supply has an easily accessible disconnecting device (for
example a switch or a plug). This disconnecting device is clearly
identified. So in the case of an emergency, it is clear which
disconnecting device belongs to which power supply cable.
The cross-section of the ground conductor is the same size as or
bigger than the cross-section of the power supply cables.
Relevant for North America:
The power supply cables are suitable for ambient air temperatures of
at least +167 °F (+75 °C). The wires of the power supply cables are
made of copper.
Only for device
variants featuring
supply voltage with
the characteristic
value CC:
If you connect 2 independent power sources, verify that the minus
terminal is grounded. Failure to follow this instruction can result in
equipment damage.
The wire diameter of the power supply cable is at least 0.75 mm² (North
America: AWG18) on the supply voltage input.
The following requirements are
alternatively
complied with:
Alternative 1
The power supply complies with the requirements
for a limited power source (LPS) according to IEC/
EN 60950-1 or PS2 according to IEC/EN 62368-1.
Alternative 2
Relevant for North America:
The power supply complies with the requirements
according to NEC Class 2.
Alternative 3
All
of the following requirements are complied with:
The power supply complies with the
requirements for a safety extra-low voltage
(SELV) according to IEC 60950-1 or ES1
according to IEC/EN 62368-1.
A back-up fuse suitable for DC voltage is
located in the plus conductor of the power
supply.
The minus conductor is on ground potential.
Otherwise, a back-up fuse is also located in the
minus conductor.
Regarding the properties of this back-up fuse:
See “General technical data” on page 54.
Table 3:
Requirements for connecting the supply voltage
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