Assembly Procedures For The Busbar Connection; Control Circuit And Fi Eld Wiring - Allen-Bradley 140G-R Installation Instructions Manual

There are variables when using different dimensional sized busbar, and/or the number of busbars. It is requirement to maintain the minimum
cross section as shown in the table and use the entire contact surface of the terminal. Vertical busbar for 2500A (100%) and 3000A (80...100%)
are required to have .25 inch (6.4 mm) thickness for the inner (3) busbars.
Positioning the fi rst anchor plate of the busbars
Anchoring to the switchboard max dimensions
Fig. 12
5.1.3

Assembly procedures for the busbar connection

Check the state of the contact surfaces of the connections very carefully: they must be very clean and free from burrs, dents and traces of rust
- which must be removed with a fi ne fi le or emery cloth to prevent localized increases in temperature. On completion of the operation, remove
any traces of grease or dust with a cloth soaked in a suitable solvent.
When aluminium connections are used, the contact surfaces must be tin-plated.
Make sure that the busbar connections do not exert strain on the terminals in any direction.
Always insert a large diameter fl at washer and spring washer (to distribute the tightening pressure over the widest possible area).
Establish contact between the connection and terminal and fully tighten to the required torque.
Always use two wrenches (to prevent the insulating parts from being unduly stressed) and apply the tightening torque of the main terminals = 70
Nm/615 lb in for M12 high-strength screws. Check tightness after 24 hours.
5.2 Control circuit and fi eld wiring
The fi eld connection are made using screw terminals. Terminals are marked with identifi cation codes as indicated in the electrical circuit diagram.
Fig. 13
DIR 1000682R0002 Version 03
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7.48"
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