{
 "id": "4.15",
 "slug": "in-rack-busbar-and-power-whips",
 "url": "/parts/servers-racks-and-integration/in-rack-busbar-and-power-whips",
 "name": "In-rack busbar & power whips",
 "qualifiers": null,
 "layer": {
  "id": 4,
  "name": "Servers, racks & integration"
 },
 "parent_id": null,
 "children": [],
 "summary": "The high-current busbar and cabling that carries power from the rack's power shelves to each tray, including Nvidia's specified ±48 V / 1,400 A busbar used in rack-scale liquid-cooled systems.",
 "description_md": "Busbar and power whips are the last stretch of power distribution inside the rack, carrying current from the power shelves (4.12) to each tray's own board-level power delivery (4.08). A solid or laminated busbar running vertically through the rack, rather than a bundle of individual cables, is what rack-scale systems use to move very high current at the ±48 V level the taxonomy specifies for NVL72-class racks; a bundle of discrete power whips remains the more conventional approach outside that specific architecture. The shift toward busbar reflects how much current a fully populated GPU rack now needs to distribute internally — a level that individual cables handle poorly at scale. For investors, this is a component defined by its current-carrying and thermal-management engineering rather than by exotic materials, and the suppliers building to the Nvidia-spec busbar are working from a reference design that's likely to be revised with each rack generation, which keeps requalification a recurring event rather than a one-time qualification.",
 "ai_delta": "Fully populated GPU racks need to move more current internally than a bundle of discrete cables handles well, which is why rack-scale systems increasingly use a solid busbar rather than conventional power whips.",
 "bottleneck_status": null,
 "scale_tiers": [
  "enterprise",
  "hyperscale_building",
  "ai_campus",
  "gw_class"
 ],
 "density_modes": [
  "any"
 ],
 "scale_notes": "the high-current ±48 V busbar architecture is specific to rack-scale liquid-cooled systems at hyperscale and above; smaller enterprise racks more often use conventional power whips.",
 "flow": [
  "compute",
  "power"
 ],
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}