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
≈800 mAIllustrative 800 VDC / 1,000 Ω contact-current calculation; potentially fatal exposure, not an injury or arc prediction
~87%SemiAnalysis’s modeled SST/800 VDC architecture; compare with Chapter 4.1’s separate assumed AC ledger