Ref ID : ADR233B/IM/SGI
Rev No. : 05
ADR233B
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.
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.
The recommended minimum protective conductor (earth) wire size is 2.5 mm² or as per
industrial standard practice. The protective conductor (earth) connection must be of low-
inductance and as short as possible.
All connections to the equipment must have a defined potential.
Before energizing the equipment, the following points should be checked:
• Voltage rating / polarity (rating label / equipment documentation);
• CT circuit rating (rating label) and integrity of connections;
• Integrity of the protective conductor (earth) connection (where applicable);
• Voltage and current rating of external wiring, applicable to the application.
Accidental touching of exposed terminals
If working in an area of restricted space, such as a cubicle, where there is a risk of electric
shock due to accidental touching of terminals which do not comply with IP20 rating, then a
suitable protective barrier should be provided.
If the equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
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