Vertiv™ | Liebert® LDMF™ Distribution Monitoring User Manual | 6
The PM4 Large Interface Board (PLIB) provides voltage and current attenuation for Square-D I-
Line panelboards. There are 42 CT locations on each LIB for a total capacity of eight 4-wire (3
phases and neutral) or 5-wire (3 phases, neutral and ground) breakers.
WARNING
Before connecting a large CT to the PLIB, note the CT MUST have a 1A secondary.
Connecting anything other than a 1A secondary CT will damage the PLIB and the CT.
To ensure the proper current ratio and accuracy, the CTs should be purchased through
Vertiv. See Table 1 for details. Contact your local Vertiv representative or call Vertiv
Support at 800-543-2378.
Two PLIBs are supplied for a total maximum monitoring capacity of sixteen 5-wire I-Line
and/or subfeed breakers.
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