ABB REL 551 2.3 Series Installation And Comissioning Manual page 35



Making the electrical connections
Where:
1 is ferrules
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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.
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Connect the unit to the grounding bar of the cubicle with a green/yellow conductor,
cross section at least 1.5 mm
at the back of the terminal.
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When using screened cables always make sure screens are grounded and connected in
according to applicable engineering methods. This may include checking for appropri-
ate grounding points near the terminal, for instance, in the cubicle and/or near the source
of measuring. Ensure that ground connections are made with short (max. 10 cm) con-
ductors of an adequate cross section, at least 6 mm
tions.
Lc
Rx
Relay
Terminal
Tx
Sc
2
(AWG16), connected to the protective ground connector
2
(AWG10) for single screen connec-
Cc
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Lc
Tx
External
Equipment
Rx
Sc
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