Effective Mar 2018
4-7
CIRCUIT BREAKER/STRUCTURE
INTERFACING
WARNING
NEVER DISABLE OR DEFEAT ANY INTERLOCKS. THEY
ARE INTENDED FOR PROPER AND SAFE OPERATION.
FAILURE TO COMPLY COULD RESULT IN DEATH,
SEVERE PERSONAL INJURY AND/OR PROPERTY DAM-
AGE DUE TO THE HAZARDOUS VOLTAGE PRESENT.
Type VCP-WL Circuit Breakers are supplied with a series of
interlocks to insure safe and proper interfacing between the
circuit breaker and its compartment. Specific interlocks are
described in the next paragraph to provide proper
familiarization. An interfacing check should be performed as
also described in the next paragraph.
4-7.1
INTERFACE INTERLOCKS/INTERFACING
CHECK
Refer to Figures
3-5, 4-1
and
4-3
for visual interlock and
interface check references. The following interlocks are
provided to ensure safe and proper operation:
Code Plates
Code plates are provided to prevent the insertion of a circuit
breaker into a structure of a higher power rating. Compatible
plates on the circuit breaker and in the compartment form
this interlock.
NOTICE
Code plates do not block out control voltage or scheme
incompatibility.
Maintenance Interlock
This interlock trips, closes and trips the circuit breaker if it is
closed and charged as the circuit breaker is withdrawn from
the TEST position to the extension rails. The circuit breaker
open and closing springs are, therefore, discharged. A
closed breaker cannot be moved into the TEST position
from the extension rails.
Levering Interlock
If the circuit breaker is closed as the levering-in crank is
engaged to move the circuit breaker from the TEST to the
CONNECTED position, the circuit breaker trips.
Figure 4-4 Engaging Levering-In Crank
