ANSI · American National Standards Institute
The US standards accreditor whose imprimatur turns industry documents into national standards that lenders, insurers, and code officials treat as the governing reference.
Current numbers
UL 1449 5th Ed.current North American SPD listing basis, ANSI-approved 2025; NEC mandates UL 1449 listing
ATS-2025ANSI/NETA Acceptance Testing Specifications — the current as-installed bar for switchgear, breakers, relays and primary injection
2021current edition of ANSI/ASHRAE Standard 188 (Legionellosis risk management); mandates a written Water Management Program for any cooling tower