Instruction Book
Page 22
Effective: May 2016
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IB131017EN
SECTION 4: INSTALLATION AND WIRING
NOTICE
Refer to the circuit breaker weights in Table 3.1 to
ensue: that any table used for inspections is capable
of supporting the circuit breaker.
4 - 1 INITIAL INSPECTION
Before attempting to use or put a circuit breaker into
service, examine it for loose or obviously damaged parts. In
addition, compare the circuit breaker nameplate with
associated drawings, shipping papers and ordering
information for compatibility. A circuit breaker should also
be operated manually. To check the manual operation of a
circuit breaker, follow the operational procedures outlined in
Section 5.
For fixed breaker applications, an electrical operations
check should be performed after the breaker is
appropriately mounted, secondary wiring completed, and
any appropriate inter-phase barriers installed. To check
the electrical operation of a circuit breaker, follow the
operational procedures outlined in Section 5.
For drawout breaker applications, an electrical operations
check should be made with the breaker in the TEST
position or by using a 'Test Cable" with the breaker out of
its cell. Refer to paragraphs later in this section covering
"Circuit Breaker Positioning" and "Drawout Electrical
Interfaces". Once familiar with this information, refer to
Section 5 for electrical operation procedures.
4 - 2 ELECTRICAL CLEARANCES
It is the responsibility of the customer to insure that the
proper electrical clearances are maintained on the circuit
breaker, in the assembly structure, and between the circuit
breaker and its assembly structure. These required
electrical clearances must be in keeping with the
appropriate ANSI standards and the specific BIL application
level. The BIL rating associated with a particular circuit
breaker is clearly indicated on its nameplate located on the
front cover. Also refer to Table
1.1
for circuit breaker rating
details.
4 - 3 INTERPHASE BARRIERS
ANSI requires specific dielectric performance. It is the
customer's responsibility to insure that all required inter-
phase barriers are in place on the circuit breaker before
the circuit breaker is placed in service. Appropriately
sized and constructed barriers are supplied with the
circuit breaker. The number and types (vertical or
horizontal) of barriers used with fixed and drawout
circuit breakers depend primarily on the circuit breaker
rating. Refer to Figures
1-1
to
1-8
for
the barriers used with specific breakers. Any other barriers
required to meet ANSI requirements must be supplied by
the customer. They must be constructed of an appropriate
insulating material, such as thick high strength, track
resistant glassmat polyester or polycarbonate of
appropriate thickness.
4-4 FRONT COVER
The front cover of VCP-TL and VCP-TRL circuit breakers is
designed such that the customer can choose to have a
closed door or open door design. If a closed door design is
selected, an appropriately sized door cutout can be
provided by the customer to permit access to all front
mounted circuit breaker controls and devices (Figure
3-9
).
4-5 INSTALLING FIXED CIRCUIT BREAKER
The VCP-TRL fixed type circuit breaker differs from the
VCP-TL drawout circuit breaker in that it has no levering
device, primary disconnects and secondary umbilical
disconnect (Figure
4-1
). In addition, a VCP-TRL fixed
circuit breaker does not have a standard feature to hold the
breaker in a trip free position. To ensure the proper
sequence of operation between two or more circuit
breakers, an optional key interlock and/or optional cable
interlock can be used.
4-5.1 FIXED MECHANICAL INTERFACES
The customer is responsible for providing all required
mechanical interfaces to insure that the VCP-TRL fixed
circuit breaker is properly installed and applied in a fixed
con-figuration. This responsibility includes but is not limited
to the following:
1.
The circuit breaker must be securely mounted in an
installation capable of supporting the circuit breaker's
weight. Mounting holes are provided in the bottom pan of
the circuit breaker for use with appropriate mounting hard-
ware (Figures
1-1, 1-2
and
4-2).
2. Appropriately sized, secured, and braced primary
connections must be provided, whether the connections
take the form of cable or bus bar. Circuit breaker primary
terminals have holes for making bolted horizontal primary
bus connections. Refer to Figures in Chapter 1 for primary
connection details, such as primary spacing and hole
patterns.
4-5.2 FIXED ELECTRICAL INTERFACES
Secondary electrical connections can be made through a
standard secondary disconnect block or an optional screw
type terminal block. Both secondary connection devices are
mounted at the top, front of the circuit breaker. Secondary
contacts are dedicated and identified. Refer to Figures
5-10
to
5-13
for secondary connection details.
