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Motor Control Centre type TQ is
a free-standing and floor mounting type switchboard
available both in single front and double front
versions, suitable for indoor installation.
To facilitate transportation, the MCC is split into multiple sections. Each section is wrapped in an HDPE cover and packed in a wooden case.
To arrive at the approximate overall dimensions of the packing cases, add 300mm to the dimensions of the packing cases, add 300mm to the dimensions of the respective section.
Each vertical panel is divided into distinct zones for busbars, feeders, power cabling and auxiliary busbars.
Horizontal busbars (HBB) are located at the top of the panels. The phase sequence, from rear to front, is N-R-Y-B. Where the number of bars per phase exceeds three, the HBB is split into two packets per phase. The phase sequence is N-R1-Y1-B1-R2-Y2-B2 from rear to front.
The droppers are located behind the unit chamber and isolated from the unit compartment with an insulating barrier. The phase sequence, as seen from front left to right, is R-Y-B-N. Busbar joint shrouds can be provided on the HBB for complete insulation. These shrouds are click-fit and can be easily removed for tightening the joints.
Auxiliary busbars, if required, are located in the top-front chamber of the panel. The support and tap-off system is integrated. In the double front MCCs, auxiliary busbars are placed in one of the fronts, and tap-offs are taken for the units in both the fronts.
The incoming power contacts are located on the right hand side, while the outgoing power contacts are located on the right hand side.
The starter unit in the fully
drawout version has the following positions:
Connected (service) position
Test position
Disconnected (isolated) position
Maintenance position
Hinged/tilted position
The connected/test/disconnected positions are indicated by matching red lines on the bottom tray of the compartment and the red arrow mounted on the withdrawable unit.
The control contacts, i.e. the Secondary Isolating Contacts (SICs) are mounted in 2 columns on the unit. The rear column comprises SIC making in “Service” position. The front column can have the following varieties of SICs :
Service + Test
Test only
Service only
For 100, 200 and 300mm units,SICs can be located on LHS also. Such control terminals
are duplicated in the cable alley. Wiring from the LHS SICs to the fixed terminals is factory-assembled and
routed through a PVC duct mounted on the bottom side of upper tray for respective unit.
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