Connecting To Protective Earth; Making The Screen Connection - ABB REB 551-C3*2.5 Installation And Commissioning Manual

3.3
3.4
Making the electrical connections
If the terminal is equipped with a test-switch of type RTXP 24 COMBIFLEX wires with 20 A
sockets must be used to connect the VT circuits and the auxiliary power.

Connecting to protective earth

Connect the unit to the earthing bar of the cubicle with a green/yellow conductor, cross section
2
at least 1.5 mm (AWG16), connected to the protective earth connector at the back of the termi-
nal.

Making the screen connection

When using screened cables always make sure screens are earthed and connected in according
to applicable engineering methods. This may include checking for appropriate earthing points
near the terminal, for instance, in the cubicle and/or near the source of measuring. Ensure that
earth connections are made with short (max. 10 cm) conductors of an adequate cross section, at
2
least 6 mm (AWG10) for single screen connections.
Lc
Rx
IED
Tx
Sc
Cc
Chapter 5
Installing the terminal
Lc
Tx
External
Equipment
Rx
Sc
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