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Can conductors be spliced in an isolated power system?

Issue:
Spliced conductors in an isolated power system

Product Line:
Hospital Isolated Power Systems

Environment:
NFPA99, NEC517.160

Cause:
A conductor commonly is spliced with another when its length is insufficient, or when oversized to mitigate voltage drop along its length, it may be spliced at its end to a short length of smaller conductor to permit termination in the available provisions.

Resolution:
Splicing conductors in an isolated power system adds to the overall system impedance and therefore should be avoided; however, if splicing cannot be avoided only compression connectors should be used.