20
PART B Installation, Operation & Maintenance
4.2.2 Installation of Breaker with cabinet
at lower height
Circuit Breakers are be transported in three
parts as explained below.
1 Cabinet with Spring-Mechanism Drive &
Electrical wiring & apparatus.
2 Duct-with-Poles and the inter-pole-links.
3 Structure Assembly and connecting drive
link & pipe assemblies.
Before delivery, both Tripping and Closing Springs are
discharged and Circuit Breaker kept in OPEN position.
Following additional items are supplied
and to be used for installation of control cabinet
at lower height:
Extended Drive-link
Special pin for setting
Cover for driver-link
Top support angle
Before starting installation ensure that foundation with
Foundation Bolts as per drawing is ready (Refer Fig.1a,
1b & 1c on page 47, 48 & 49).
4.2.2.1 Various parts of Structure assembly:
List of the parts of structure
1. Upper Leg Assly- 2 Nos.
2. Lower Legs Assly – 2Nos
3. Top Support Angles
(front and rear)
2 Nos
5. Stiffeners – 2Nos
6. Cross-Angles. – 4 Nos
7. Foundation Bolts- 4 Nos [2 Nos
Additional for CT structure ]
List of the additional parts for CT structure
8. Upper Leg Assly – 2Nos
9. Lower Leg Assly – 2 Nos
10. Support Angles – 2 Nos
11. C-Channel for C.T/P.T.- 1 No
12. Cross Angles – 2 Nos.
One Spanner each [open & ring] of size 18x19
& 24x27 needed to assemble the structure
Parts of structure assembly
4. Bottom Support Angles
(front and rear)
2 Nos
11
8
9
5
12
9
10
1
3
2
7
4
6
6
