GE MVAX 11, Technical Manual

4.

INSTALLING, COMMISSIONING AND SERVICING

Equipment connections 
Personnel undertaking installation, commissioning or servicing work 
for this equipment should be aware of the correct working 
procedures to ensure safety. 

The equipment documentation should be consulted before 
installing, commissioning, or servicing the equipment. 

Terminals exposed during installation, commissioning and 
maintenance may 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.  

Watchdog  (self-monitoring)  contacts  are  provided  in 
numerical relays to indicate the health of the device.  

General 

Electric

  strongly  recommends  that  these  contacts  are  hardwired 

into the substation's automation system, for alarm purposes. 

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. 



When the protective (earth) conductor terminal (PCT) is also 
used to terminate cable screens, etc., it is essential that the 
integrity of the protective (earth) conductor is checked after 
the addition or removal of such functional earth 
connections.  For M4 stud PCTs the integrity of the protective 

(earth) connections should be ensured by use of a locknut or 
similar. 

The recommended minimum protective conductor (earth) wire size 
is 2.5 mm² (3.3 mm² for North America) unless otherwise stated in 
the technical data section of the equipment documentation, or