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A B
Terminal
38
Installing the serial communication cable for
RS485 SPA/IEC
Cc
PE
Where:
1
The inner shields shall be connected together (with an isolated terminal block) and only have one
earthing point in the whole system, preferably at the external equipment (PC).
The outer shield shall be connected to Protective Earth (PE) in every cable end i.e. to PE at all
relay terminals and to PE at External equipment (PC). The first terminal will have only one cable
end but all others of course two.
Cc
Communication cable
PE
Protective earth screw
Figure 9:
Communication cable installation
Cc
1)
A
B
Terminal
PE
PE
Chapter 5
Installing the terminal
A B
External
Equipment (PC)
PE 1)
en03000111.vsd
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