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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 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 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.
e
The new Rogowski assemblies are installed and ready for use.
e
Tools required: Wrenches, wire stripper, wire cutter, continuity tester.
38-
AKD-8, Multi-Source Ground Fault
2TSA451009P0000 Rev-B
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
For 4 wire multi-source Ground Fault systems, the Retrofill should be ordered with a neutral
CT adapter. These neutral CT adapters are compatible with MVT style neutral sensors. This
will allow the new breaker to operate with the existing Neutral CT in most cases.
Example: Neutral sensor Cat numbers beginning with TSVG & CT part #'s 139C4970G#'s.
Please note that these neutral CT adapters are not compatible with Power Sensor or SST
style neutral sensors.
Replace an SST Neutral CT with a TSVG...BK iron core sensor which
will be compatible with the Neutral CT Adapter.
Note:
For 4 wire multi-source Ground
Fault systems
using Rogowski sensors is more
difficult and requires that an external GF summing CT scheme must be implemented. This
applies to Main—Tie—Main systems or systems with a Main source and then a back-fed
generator source.
© 2020 Emax 2 Retrofill Circuit Breakers 800-S000A | 73
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