GE Industrial Solutions EntelliGuard R AKD-5 - Manual (Page 39)

38 EntelliGuard R Circuit Breaker Retrofill AKD-5 Installation Manual DEH-41547 02/12
Install Door Interlock System (Breaker Side)
Figure 52 shows the components that make up the AKD-5 retrofill door interlocking assembly:
Figure 52. AKD-5—Door Interlocking Components
For the retrofit, instructions for installing the interlocking system on the AKD-5 switchgear are the same
as those for EntelliGuard G Circuit Breaker. Refer to the
Installation, Operation, and Maintenance Manual
for the EntelliGuard G Circuit Breaker, DEH-41304, 02 Apr 09.
Neutral Disconnect Assembly (Breaker Side)
When a legacy AK breaker is replaced with a retrofitted EntelliGuard ACB, the incoming wires from the
neutral CTs need to be routed to the cassette secondary-disconnects directly.
Install AKD-5—Neutral Rogowski Current Transformer (CT)
The AKD-5 EntelliGuard R Circuit Breaker uses an open-core Rogowski Current sensor to measure
current level vs. an iron core style used in the legacy AK, AKR breakers. For the retrofill to calculate the
current levels on a 4-wire circuit, the neutral iron core CT in the cable compartment must be replaced
with a Rogowski style CT.
The current transformer comes with the CT-mounted on copper bars matching the same hole-pattern
as the existing neutral bar.
The external neutral Rogowski mounting kit comes with three mounting brackets, two fixing screws, two
cable ties, one 2-m long twisted pair extension lead and one neutral Rogowski coil.