ITEM INSPECTED PROCEDURE POSITIVE CHECK
8
Key lock (if provided). Open the circuit breaker, keep the opening
pushbutton depressed, then turn the key and
remove it from the housing.
Attempt the circuit breaker closing operation
Carry out the closing operation.
Neither manual nor electrical closing takes
place
Both electrical and manual closing take place
normally; in this position the key cannot be
removed.
9
Auxiliary contacts in the
operating mechanism.
Insert the auxiliary contacts in suitable
signalling circuits.
Carry out a few closing and opening
operations.
Signals take place normally.
10
Undervoltage override
(if provided).
With the circuit breaker open, springs charged,
override not connected and undervoltage
release not supplied with power, attempt
circuit breaker closing.
Closing is not possible.
11
Locking electromagnet
With the circuit breaker open, springs charged
and locking electromagnet not supplied,
attempt circuit breaker closing both manually
and electrically.
Closing is not possible.
12
Locking electromagnet
on the truck circuit
provided).
With the circuit breaker open, in the isolated
for test position and the locking
electromagnet not supplied, attempt circuit
breaker racking-in.
Supply the locking electromagnet and carry
out the racking-in operation
Racking-in is not possible.
Racking-in takes place correctly.
13
Auxiliary transmitted
contacts for signalling
circuit breaker racked-in,
isolated (UniGear or
UniSafe switchgear).
With the circuit breaker racked into the
enclosure, carry out a few traverse operations
from the isolated for test position to the
connected position.
Take the circuit breaker to the racked-out
position.
The signals due to the relative operations take
place normally.
T3
—
8. Putting into service
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