50| © 2020 Emax 2 Retrofill Circuit Breakers 600A-4000A 2TSA451011P0000 Rev-B
Figure 95
Wiring Diagram
For Detail instructions on NCT Adaptor refer installation manual No 2TSA451018P0000
28 - Procedures
Notice
NEUTRAL CT ORIENTATION
Write down the orientation of the existing Iron
core CT and the polarity of the connections. The
orientation and polarity needs to be matched
when the air core Rogowski is assembled in the
cable compartment.
1. Ensure that the LVS has been de-energized and the breaker in the compartment being
retrofit is switched off and removed from the LVS.
2. Open the door on the rear of compartment to access the Cable/ Bus compartment of
the LVS
3. Note that the existing neutral CT assemblies are usually mounted vertically on two
copper bus bars placed horizontally.
4. Disconnect the wires that are attached to the existing CT assemblies and place them
such that they do not interfere with the replacement of the CT assemblies.
5. Unfasten and remove the bolts that hold the neutral disconnect assemblies to the
horizontal bus bars. Keep the hardware in a secure location for reassembly.
6. Be careful while handling the CT assemblies such that they do not fall down or damage
other components within the LVS.
7. Replace the old CT assembly with the new Rogowski assembly on the horizontal bus bars
and fasten it using the hardware previously removed.
8. Connect a “twisted pair” of wires from the compartment neutral disconnect to the
Rogowski CT. In case of damaged wire, the same must be replaced with new ones as
already mentioned.
9. Check for continuity from the CT leads to the plungers on the neutral disconnect
assemblies within the LVS compartment. Be sure to orient the CT and wires for proper
polarity.
The new Rogowski assemblies are installed and ready for use.
Tools required: Wrenches, wire stripper, wire cutter, continuity tester.
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