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ABB REL 551 2.3 Series - Page 35

ABB REL 551 2.3 Series
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29
Making the electrical connections &KDSWHU
,QVWDOOLQJWKHWHUPLQDO
)LJXUH &RQQHFWHGFDEOHVZLWKIHUUXOHV
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
2
(AWG16), connected to the protective ground connector
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
2
(AWG10) for single screen connec-
tions.
Where:
1 is ferrules
en0300087.vsd
Rx
Tx
Sc
Lc
Tx
Rx
Sc
Lc
Cc
Relay
Terminal
External
Equipment

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