Vertiv™ | Liebert® LDMF™ Distribution Monitoring User Manual | 11
To configure the branch circuits, refer to 5.5.11 - Add a Circuit Breaker.
4.2 Installing a Solid-Core Current Transformer
The CT for the panelboard main input circuit breaker is hard-wired to the connectors. Removing
CT wires from the connector requires a pin extraction tool.
Contact Vertiv Support at 800-543-2378 for assistance.
Typically the three-phase and neutral wires utilize a CT rating of 100:1, 200:1 500:1 or 1000:1, while
the ground wire utilizes a CT rating of 100:1.
Route the circuit wire through the core of the CT and wire-tie the CT to the cable. Refer to the
manufacturer's documentation for proper orientation to ensure accurate readings.
NOTE
• Panelboard A is either Panelboard 1 or Panelboard 3.
• Panelboard B is either Panelboard 2 or Panelboard 4 depending on which Liebert LDMF
Control Board is being configured.
WARNING
A solid-core CT cannot be installed on a wire while current is flowing through the wire.
Damage to the burden resistor and CT will occur. Power must be removed before installing
and/or removing any CT. CT’s should be installed only by properly trained qualified
electricians.
NOTE
When replacing or installing a CT, ensure that the replacement CT has a secondary rating of 1A—
for example, 100:1, 200:1, 500:1 or 1000:1. Using a higher-rated CT—for example, 100:5 or 500:5-
will damage the burden resistors on the PIB board.
NOTE
When installing CT’s for a large branch circuit breaker or subfeed, verify which monitoring board
is installed.
• A PIB can support up to three subfeeds,.
• One LIB can support up to eight output and/or subfeed breakers.
• Two LIB boards are provided to support up to 16 output and/or subfeed breakers.
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