Can a surge protective device (formerly TVSS) be installed on an isolated power system?

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Issue:
Application

Product Line:
Install TSS device on a Hospital Isolated Power System

Environment:
NFPA 99, NEC 517.160

Cause:
Installation / Setup

Resolution:
No, these devices are designed for grounded systems and should not be installed in Isolated Power Systems. UPS/surge protective devices normally include inverters, suppressors and filters which compromise the proper function of the Line Isolation Monitor.