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EntelliGuard R Circuit Breaker Retrofill AKD-10 Installation Manual DEH41550 R06
Procedures
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 the compartment to access the Cable/ Bus compartment of the LVS
3.
Note that he 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 handeling 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 back to the Rogowski CT assembly leads.
9.
Check for continuity from the CT leads to the A24 and A25 secondary disconnect screw terminal within
the LVS compartment. NEVER push probes into the front of the secondary disconnect.
•
The new Rogowski assemblies are installed and ready for use.
•
Tools required: Wrenches, wire stripper, wire cutter, continuity tester.
AKD-10—Multi-Source Ground Fault
Retrofills can be used in the following ground fault applications:
•
Single Source Feeder breakers, 3 wire or 4 wire
•
Main Circuit breakers, 3 wire or 4 wire
•
Main or Tie breakers 3 or 4 wire multi source ground fault scheme-using original iron core neutral CT and
the neutral CT adapter on each Retrofill breaker.
