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Entellisys Low Voltage Switchgear
Chapter 5. Installing and Removing Circuit Breakers
5-1 General
Inspection and Preparation of Circuit
Breakers
Before installing, operating, or removing a circuit breaker,
refer to the breaker instruction manual for preparation,
inspection, and test. Check thoroughly for damaged or loose
parts and for any dirt or foreign matter that may be in the
breaker. Be sure that a thin film of GE lubricating grease
D6A15A2 is present on primary disconnects of the switchgear
before installing the breaker.
Circuit Breaker Installation
To install a circuit breaker, proceed as follows:
1.
Before installing a breaker, check the tightness of the
bolted joints in the primary disconnect bars. Refer to
torque value table, Appendix A, Table A-1, in this
manual for the proper torque values. Also check the
contact areas on each primary disconnect bar or cluster
of fingers for foreign matter that may have accumulated.
Clean these areas if necessary. Be sure that a thin film
of GE lubricating grease D6A15A2 covers the contact
areas before putting a breaker in the compartment.
2.
Check to see that the breakers match their respective
compartments. Each breaker is assigned a part or mark
number. This number is shown on the breaker sheets of
the summary, the front view drawings, the breaker
nameplate, and on the identification card on the breaker
shipping carton. The breaker may also be identified
using the 8 digit catalog number.
3.
To locate the breaker in the proper compartment, refer
to the breaker location list on the front view drawing.
Find the proper breaker by the identification card on the
breaker carton or the mark number on the breaker
nameplate. All identical breakers will have the same
mark and catalog number.
EGX-08 SETTING
Fig. 5-1. Rejection pin mounting used in EG-08/16/20 compartments
Rejection Feature
Drawout breakers of the same type and rating are inter-
changeable in their equipment compartments. Drawout
breakers of different frame size, type, or short-circuit rating
are intentionally made non-interchangeable to prevent
inserting the wrong type breaker into a drawout
compartment; unique "rejection hardware" is affixed to each
breaker and its compartment. When the wrong type breaker
is inserted into a cell, the pins on the breaker and the pins in
the cell interfere, thus preventing the wrong breaker from
being racked onto the primary stabs.
EXCEPTION:
A breaker with a higher short-circuit rating
will fit into a compartment keyed for a lower short-circuit
rating. For example, an EGH-08 breaker can be inserted
into an EGS-08 compartment. An EGH-08 compartment,
however, will reject an EGS-08 breaker.
EXCEPTION:
Un disjoncteur ayant un calibrage éléve de
court-circuit accomodera un compartiment classifié d’un
calibrage moindre de court-circuit. Par exemple, un
disjoncteur EGH-08 peut être inséré dans un comparitment
EGS-08. Cependant un disjoncteur EGS-08 sera rejeté d’un
compartiment EGH-08.
Figs. 5-1 and 5-2 illustrate the rejection pin mounting used in
EGS-08, EGH-08, EGF-08, EGX-08, EGS-16, EGH-16, EGF-
16, EGS-20, and EGF-20 compartments.
EGX-08 SETTING
Fig. 5-2. Rejection pins used in EG-08/16/20 compartments
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