Warning Signs - ABB REL670 Installation And Commissioning Manual

Warning signs

Chapter 2
Safety information
1 Warning signs
Warning!
Strictly follow the company and country safety regulations. Working in a high voltage environ-
ment requires serious approach to avoid human injuries and damage to equipment.
Warning!
Do not touch circuitry during operation. Potentially lethal voltages and currents are present.
Warning!
Always use suitable isolated test pins when measuring signals in open circuitry. Potentially le-
thal voltages and currents are present.
Prohibition!
Never connect or disconnect a wire and/or a connector to or from a IED during normal opera-
tion. Hazardous voltages and currents are present that may be lethal. Operation may be disrupt-
ed and IED and measuring circuitry may be damaged.
Warning!
Always connect the IED to protective earth, regardless of the operating conditions. This also
applies to special occasions such as bench testing, demonstrations and off-site configuration.
Operating the IED without proper earthing may damage both IED and measuring circuitry and
may cause injuries in case of an accident.
Warning!
Never disconnect the secondary connection of current transformer circuit without short-circuit-
ing 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.
Warning!
Never remove any screw from a powered IED or from a IED connected to powered circuitry.
Potentially lethal voltages and currents are present.
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