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
230 / 400 VIEC LV utilization (1φ / 3φ) vs ANSI 120/208 V or 277/480 V
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