8
Installation RSP 20/25/30/35
Release
15
12/2017
Supply voltage
The supply voltage is connected to the device casing through protective
elements exclusively.
For supply voltage connections with protective conductor connection:
First connect the protective conductor before connecting the wires for
the supply voltage.
For device variants featuring supply voltage with characteristic value
CC and TT:
For the redundant power supply, only use voltage sources whose
negative terminal is grounded. The use of different voltage sources
can lead to equipment damage.
Only device variants
featuring supply
voltage with
characteristic value
TT:
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) as per EN 60950-1.
Alternative 2 All of the following requirements are complied with:
The power supply complies with the
requirements for a safety extra-low voltage
(SELV) as per IEC/EN 60950-1.
A fuse suitable for DC voltage is located in the
plus conductor of the power supply.
The minus conductor is on ground potential.
Otherwise, a fuse is also located in the minus
conductor.
Regarding the properties of this fuse:
See “General technical data” on page 49.
Alternative 3 Relevant for North America:
The power supply complies with the requirements
according to NEC Class 2.
Only for device
variants featuring
supply voltage with
characteristic
value K9 or KK:
All of the following requirements are complied with:
Supply with DC voltage:
A fuse suitable for DC voltage is located in the plus conductor of the
power supply.
The minus conductor is on ground potential. Otherwise, a fuse is also
located in the minus conductor.
Regarding the properties of this fuse:
See “General technical data” on page 49.
The wire diameter of the power supply cable is at least 1 mm² (North
America: AWG16) on the supply voltage input.
Supply with AC voltage:
A fuse is located in the outer conductor of the power supply.
The neutral conductor is on ground potential at both voltage inputs.
Otherwise, a fuse is also located in the neutral conductor.
Regarding the properties of this fuse:
See “General technical data” on page 49.
The wire diameter of the power supply cable is at least 0.75 mm²
(North America: AWG18) on the supply voltage input.
Device variant Requirements
Table 3: Requirements for connecting the supply voltage
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