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Page 30
Due to RMS continuous product improvement policy this information is subject to change without notice. 1S20_User_Guide/Iss C/10/07/23
Equipment Operating Conditions
The equipment should be operated within the specified electrical and environmental limits.
Protective relays, although generally of robust construction, require careful treatment prior to
installation and a wise selection of site. By observing a few simple rules, the possibility of
premature failure is eliminated, and a high degree of performance can be expected.
Care must be taken when unpacking and installing the relays so that none of the parts are damaged
or their settings altered and must always be handled by skilled persons only.
Relays should be examined for any wedges, clamps, or rubber bands necessary to secure moving
parts to prevent damage during transit and these should be removed after installation and before
commissioning.
The relay should be mounted on the circuit breaker or panel to allow the operator the best access
to the relay functions.
Equipment Connections
Personnel undertaking installation, commissioning or servicing work on this equipment should be
aware of the correct working procedures to ensure safety. The product documentation should be
consulted before installing, commissioning or servicing the equipment.
Terminals exposed during installation, commissioning and maintenance may present hazardous
voltage unless the equipment is electrically isolated.
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. To ensure that wires are correctly
terminated, the correct crimp terminal and tool for the wire size should be used.
Before energising the equipment, it must be earthed using the protective earth terminal, or the
appropriate termination of the supply plug in the case of plug connected equipment. Omitting or
disconnecting the equipment earth may cause a safety hazard.
The recommended minimum earth wire size is 2.5mm
2
, unless otherwise stated in the technical
data section of the product documentation.
Before energising the equipment, the following should be checked:
1. Voltage rating and polarity;
2. CT circuit rating and integrity of connections;
3. Protective fuse rating;
4. Integrity of earth connection (where applicable)
