VDC · Volts direct current
The unit naming rack and facility DC-bus architectures, whose higher levels delete conversion stages and copper at the cost of new protection and grounding engineering.
Current numbers
~600 kWper Rubin Ultra Kyber rack (NVL144 = 144 packages / 576 dies) on 800 VDC
NEC 2029 (partial, forecast); UL certification pathway openNEC 2029 expected to add partial 800 VDC provisions (SemiAnalysis); UL opened an MV SST certification program in September 2026
~660 kW800 VDC monopolar power-rack reference design from NVIDIA (SemiAnalysis, May 2026); NVIDIA's availability target is H2 2026 (2026-08-11)