Safety Information  3
General
DANGER
Failing to comply with any of the instructions, precautions or warnings contained in 
this manual is in direct violation of the standards of design, manufacture, and intended 
use of the equipment.
ABB assumes no liability for the user’s failure to comply with any of these safety 
requirements which may result in personal injuries and/or equipment damages. 
WARNING
Do not, under any circumstances, remove the warning and caution labels. Information 
must be available at all times for the security of the user. 
Read this manual thoroughly before using this equipment. If you do not fully 
understand the information contained in this manual or if the equipment shows any 
sign of damage, please contact ABB. Refer to the back cover of this manual for contact 
information.
If the equipment is used in a manner not specified by the manufacturer, the protection 
provided by the equipment may be impaired. 
Electrical
The CoreSense is an overvoltage category II instrument.
Use only fuse(s) specified as appropriate for this equipment (see “Technical specifications” on 
page A51.)
In accordance with international safety standards, the sensor uses a three-wire power cord typically 
connected to an electrical panel that provides grounding for the sensor chassis.
DANGER
Disconnect power at the distribution panel circuit breaker before opening the sensor.
Ensure that the equipment and all devices or power cords connected to the sensor are 
properly grounded. Make sure that the sensor ground is at the same potential as the 
transformer ground.
Protective earthing connection (grounding) must be active at all times.
The absence of grounding can lead to a potential shock hazard that could result in 
serious personnel injury. If an interruption of the protective earthing is suspected, cut 
the power to the sensor at the plant’s distribution panel and have the electrical circuit 
tested.