PE · Protective earth
The earthing conductor carried separately from neutral to every load, giving fault current a defined low-impedance return so protective devices clear and enclosures stay safe to touch.
Current numbers
800 VDC two-wire (optional; isolated from PE)Diablo 400 v0.7.0 optional two-wire 800 VDC output, safety-isolated from PE — the bipolar ±400 V midpoint bond is the other option (see Ch 4.7)
+157%more power through the same wire gauge, 3-wire DC (POS/RTN/PE) vs 4-conductor 415 VAC — NVIDIA's Oct 2025 framing; its May 2025 basis gave ~85%. Topology-specific vendor comparison, not a constant