IB131006EN
Page 27
Effective 07/2017
4-9 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-W 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.
4-9.1 INTERFACE INTERLOCKS/INTERFACING
CHECK
Refer to Figures 3-5, 4-2 and 4-4 for visual interlock and
interface check references. The following interlocks are
provided to ensure safe and proper operation:
Figure 4-5 Pulling Secondary Disconnect Cage to
Engage Secondaries in TEST Position
(Old Version Shown). New Version will have BPI Pan
With Automatic Secondaries.
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is closed and charged as the circuit breaker is withdrawn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 4-6 Engaging Levering-In Crank
Courtesy of NationalSwitchgear.com
To Next Page
Loading...
Need help?
General
