UL · Underwriters Laboratories
The safety-certification body whose listing makes equipment routinely acceptable to code officials and insurers; unlisted gear waits, however good its engineering case.
Current numbers
~Q2 2026targeted UL listing for the first SST in NVIDIA's MGX reference (DG Matrix)
UL 1449 5th Ed.current North American SPD listing basis, ANSI-approved 2025; NEC mandates UL 1449 listing
~98% (→99%)solid-state transformer efficiency at 400 kW (13.2 kVAC→800 VDC); UL listing pending ~2029