U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
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All TitlesTitle 14Chapter IPart 25Subpart H - Subpart H—Electrical Wiring Interconnection Systems (EWIS)
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Each EWIS must be designed and installed so that:
(a) Each catastrophic failure condition—
(1) Is extremely improbable; and
(2) Does not result from a single failure.
(b) Each hazardous failure condition is extremely remote.
