Saia-Burgess Controls AG
User Manual Q.NET-xTX │ Document
27-667 –
Release ENG
01
│
2019-08-14
1-3
1
Requirements
Safety instructions
1.9
Requirements for connecting electrical wires
Before connecting the electrical wires,
always
verify that the requirements listed
are complied with.
General requirements for connecting electrical wires
The following requirements apply without restrictions:
f
The electrical wires are voltage-free.
f
The cables used are permitted for the temperature range of the application case.
f
The voltage connected complies with the requirements for a safety extra-low voltage
(SELV) as per IEC/EN 60950-1.
f
Relevant for North America:
Use 60/75 or 75 °C copper (Cu) wire only.
Requirements for connecting the supply voltage
The following requirements apply without restrictions:
f
The supply voltage corresponds to the voltage specified on the type plate of the
device.
f
The power supply conforms to overvoltage category I or II.
f
The power supply has an easily accessible disconnecting device (e.g., 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.
f
The power supply cable is suitable for the voltage, the current and the physical load.
SBC recommends a wire diameter of 0.5 mm² (AWG20).
f
The cross-section of the ground conductor is the same size as or bigger than the
cross-section of the power supply cables.
The following requirements apply alternatively:
Alternative 1
The power supply complies with the requirements for a limited power
source (LPS) as per EN 60950-1.
Alternative 2
Alle
folgenden Voraussetzungen sind erfüllt:
f
The power supply complies with the requirements for a safety
extra-low voltage (SELV) as per IEC/EN 60950-1.
f
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:
General technical data“ auf Seite 7-1.
Alternative 3
Relevant for North America: The power supply complies with the
requirements as per NEC Class 2