4. INSTALLING, COMMISSIONING AND SERVICING
Equipment connections
Personnel undertaking installation, commissioning or servicing work
for this equipment should be aware of the correct working
procedures to ensure safety.
The equipment documentation should be consulted before
installing, commissioning, or servicing the equipment.
Terminals exposed during installation, commissioning and
maintenance may present a hazardous voltage unless the
equipment is electrically isolated.
Any disassembly of the equipment may expose parts at hazardous
voltage, also electronic parts may be damaged if suitable
electrostatic voltage discharge (ESD) precautions are not taken.
If there is unlocked access to the rear of the equipment, care should
be taken by all personnel to avoid electric shock or energy hazards.
Voltage and current connections should be made using insulated
crimp terminations to ensure that terminal block insulation
requirements are maintained for safety.
Watchdog (self-monitoring) contacts are provided in
numerical relays to indicate the health of the device. General
Electric strongly recommends that these contacts are hardwired
into the substation's automation system, for alarm purposes.
To ensure that wires are correctly terminated the correct crimp
terminal and tool for the wire size should be used.
The equipment must be connected in accordance with
the appropriate connection diagram.
Protection Class I Equipment
Before
energizing the equipment it must be earthed using
the protective conductor terminal, if provided, or the
appropriate termination of the supply plug in the case of
plug connected equipment.
The protective conductor (earth) connection must not be
removed since the protection against electric shock
provided by the equipment would be lost.
When the protective (earth) conductor terminal (PCT) is also
used to terminate cable screens, etc., it is essential that the
integrity of the protective (earth) conductor is checked after
the addition or removal of such functional earth
connections. For M4 stud PCTs the integrity of the protective
(earth) connections should be ensured by use of a locknut or
similar.
The recommended minimum protective conductor (earth) wire size
is 2.5 mm² (3.3 mm² for North America) unless otherwise stated in
the technical data section of the equipment documentation, or
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