8
Installation MSP30/32/40/42 and MSM20/22/24/40/42/46/50
Release
12
06/2018
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:
The electrical wires are voltage-free.
The cables used are permitted for the temperature range of the application case.
Relevant for North America:
Exclusively use 60/75 °C (140/167 °F) or 75 °C (167 °F) copper (Cu) wire.
Requirements for connecting the signal contact
The following requirements apply without restrictions:
The voltage connected complies with the requirements for a safety extra-low voltage
(SELV) as per IEC/EN 60950-1.
The connected voltage is limited by a current limitation device or a fuse.
Observe the electrical threshold values for the signal contact.
See “General technical data” on page 72.
Requirements for connecting the supply voltage
The following requirements apply without restrictions:
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 wire diameter of the power supply cable is at least 1 mm² (North America: AWG16) on
the supply voltage input.
The following requirements apply alternatively:
Relevant when the device is supplied via 1 voltage input:
Alternative 1 The power supply complies with the requirements for a limited power source
(LPS) as per EN 60950-1.
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) 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 “Technical data” on page 72.
Relevant when the device is supplied via 2 voltage inputs:
Alternative 1 The total voltage supply meets the requirements for a limited power source
(LPS) as per EN 60950-1.
Alternative 2 Relevant for North America:
The total voltage supply complies with the requirements as per NEC Class 2.
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