Caution Signs - Hitachi Relion 670 Series Commissioning Manual

Section 2
Safety information
2.3

Caution signs

24
Dangerous voltages can occur on the connectors, even though the auxiliary voltage has been
disconnected.
Always connect the IED to protective ground, regardless of the operating conditions. This also
applies to special occasions such as bench testing, demonstrations and off-site configuration.
This is class 1 equipment that shall be grounded.
Never disconnect the secondary connection of current transformer circuit without short-
circuiting the transformer's secondary winding. Operating a current transformer with the
secondary winding open will cause a massive potential build-up that may damage the
transformer and may cause injuries to humans.
Never remove any screw from a powered IED or from a IED connected to powered circuitry.
Potentially lethal voltages and currents are present.
Take adequate measures to protect the eyes. Never look into the laser beam.
The IED with accessories should be mounted in a cubicle in a restricted access area within a
power station, substation or industrial or retail environment.
Whenever changes are made in the IED, measures should be taken to avoid inadvertent
tripping.
The IED contains components which are sensitive to electrostatic discharge. ESD precautions
shall always be observed prior to touching components.
Always transport PCBs (modules) using certified conductive bags.
Do not connect live wires to the IED. Internal circuitry may be damaged
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Commissioning manual