Areva MiCOM P441, Technical Manual

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Pxxxx/EN SS/C11
Page 6/10 Safety Section
Equipment Use
If the equipment is used in a manner not specified by the manufacturer, the
protection provided by the equipment may be impaired.
Removal of the equipment front panel/cover
Removal of the equipment front panel/cover may expose hazardous live parts
which must not be touched until the electrical power is removed.
UL and CSA Listed or Recognized Equipment
To maintain UL and CSA approvals the equipment should be installed using UL
and/or CSA Listed or Recognized parts of the following type: connection cables,
protective fuses/fuseholders or circuit breakers, insulation crimp terminals, and
replacement internal battery, as specified in the equipment documentation.
Equipment operating conditions
The equipment should be operated within the specified electrical and
environmental limits.
Current transformer circuits
Do not open the secondary circuit of a live CT since the high voltage produced
may be lethal to personnel and could damage insulation.
Generally, for safety, the secondary of the line CT must be shorted before opening
any connections to it.
For most equipment with ring-terminal connections, the threaded terminal block for
current transformer termination has automatic CT shorting on removal of the
module. Therefore external shorting of the CTs may not be required, the
equipment documentation should be checked to see if this applies.
For equipment with pin-terminal connections, the threaded terminal block for
current transformer termination does NOT have automatic CT shorting on removal
of the module.
External resistors, including voltage dependent resistors (VDRs)
Where external resistors, including voltage dependent resistors (VDRs), are fitted
to the equipment, these may present a risk of electric shock or burns, if touched.
Battery replacement
Where internal batteries are fitted they should be replaced with the recommended
type and be installed with the correct polarity to avoid possible damage to the
equipment, buildings and persons.
Insulation and dielectric strength testing
Insulation testing may leave capacitors charged up to a hazardous voltage. At the
end of each part of the test, the voltage should be gradually reduced to zero, to
discharge capacitors, before the test leads are disconnected.
Insertion of modules and pcb cards
Modules and pcb cards must not be inserted into or withdrawn from the equipment
whilst it is energised, since this may result in damage.
Insertion and withdrawal of extender cards
Extender cards are available for some equipment. If an extender card is used, this
should not be inserted or withdrawn from the equipment whilst it is energised. This
is to avoid possible shock or damage hazards. Hazardous live voltages may be
accessible on the extender card.
Insertion and withdrawal of integral heavy current test plugs
It is possible to use an integral heavy current test plug with some equipment.
CT shorting links must be in place before insertion or removal of heavy current
test plugs, to avoid potentially lethal voltages.