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
+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