Installation GRS103
Release
01
03/2022
13
Only switch on the device when the casing is closed.
Relevant for North America:
Exclusively use +60/+75 °C (+140/+167 °F) or +75 °C (+167 °F)
copper (Cu) wire.
2.9.3 Requirements for connecting the supply voltage
The supply voltage is connected to the device casing through protective
elements exclusively.
The supply voltage is electrically isolated from the casing.
Before connecting the supply voltage, always verify that the requirements
listed are complied with.
Prerequisites:
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.
Install a fuse in the outer conductor of the power supply.
Connect the neutral conductor to the ground potential. If the neutral
conductor is not connected to the ground potential, also install an external
fuse in the neutral conductor.
Regarding the properties of this fuse:
See “Power supply” on page 30.
The wire diameter of the power supply cable is at least 0.75 mm² (North
America: AWG18) on the supply voltage input.
The cross-section of the ground conductor is the same size as or bigger
than the cross-section of the power supply cables.
Use a power supply cable which is suitable for the voltage, the current and
the physical load.
Install an external fuse in the conductor that is not on ground potential.
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.
The power supply is potential-free. For power supply modules capable of
PoE, exclusively use a potential-free SELV power supply.
With redundant power supply: A positive grounding is prohibited.
Note: When using devices with redundant power supply, remove both non-
heating device couplings to disconnect the device from the power supply.
When using PoE modules, also disconnect or remove the PoE voltage.
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