A rack may be labeled 30 A, 32 A, 50 A, 60 A, or 63 A, but the conductor decision depends on real load current, continuous operation, installation temperature, raceway fill, neutral loading, overcurrent protection, and acceptable voltage drop. If you are using more than 1 rack - USE PATCH PANELS - a punch down tool and patch panels allow for you to very simply run cable at any length you desire - very clean and neat. AND when complete - you can than close up everything and just place in short patch cables. One reason I love this approach. Size data center rack branch circuits, PDUs, whips, feeders, neutrals, grounding conductors, and voltage drop using NEC 645, 210, 215, 310. Data center rack wire sizing is a design problem, not a breaker-matching habit. A rack may be labeled 30 A, 32 A, 50 A, 60 A, or. Server racks, from a strict technical point of view, are designed to house computers that are dedicated to serving out data and the associated uninterruptible power supplies (UPS) to keep them running in the event of power failure. Context: Feeding three (3) 500 A racks. customized cable length including cuts and reel. Organizing server racks and managing cables meticulously is crucial for maintaining a tidy, operational, and dependable data center.