Sheet N-313-EN: TA and TB trunks enter spine cabinet SPA-2 from the top rear, with a 2,450 mm cold aisle in front

What this sheet shows

N-313-EN is building section C-C at 1:50. A key plan at 1:150 locates the cut. The sentence under the top border gives the station and what this cut is drawn to show: Section C-C at X48295 through spine cabinet SPA-2: TA and TB trunks enter from the cabinet top rear; the cold aisle in front of SPA-2 is 2,450 mm. On the section, SPA-2 is the block labeled 48U, 800 × 1200 × 2294. Above it the trays are labeled TB 600×200, TA 600×200 and TL 400×100. The dimension on the front reads cold aisle 2450 (to Y5800 line). The dimension on the rear reads rear 1950. The key-plan caption writes the station as X48,295 and names the cut through Central spine cabinet SPA-2 (TA/TB trunk entry). Note 1 states the limit on the picture: the section shows only objects that exist on the cut line; equipment at other X positions is not superimposed. A scale bar inside the section reads 0 to 2 m and is marked 1:50. The dimension at the top of the section reads column axes Y0–Y6000 = 6000. The section labels the Y lines Y0, Y1150, Y2150, Y3350, Y4400 and Y5800, and the Z lines Z0, Z1030, Z1128, Z3422, Z3550, Z3900 and Z6854. Units are mm.

Where the trunks come in

The header is specific about how the trunks meet this cabinet: TA and TB enter from the top rear. The section draws those trays above SPA-2, labeled TB 600×200 and TA 600×200, with TL 400×100 below them. Note 5 says trays TL, TA and TB are separated in Y, and it gives the elevations: TA and TB bottoms are at Z3900, 250 mm above the TL top at Z3650. The section prints vertical dimensions 2392 and 478 beside the cabinet. Z3900 minus Z3422 is 478, and Z3422 minus the floor-board top Z1030 is 2392. Note 7 is the count: spine cabinets SPA-1..3 / SPB-1..3 receive 120 trunks each from TA (plane A) or TB (plane B); CVS-A/B receive 60 each (N-503-EN). The note names TA as plane A and TB as plane B, and it joins TA and TB with or. Both trays are drawn on this cut; the per-cabinet count is stated once, and the note points that count to N-503-EN. The key plan shows the cabinets named in the note: SPA-1, SPA-2 and SPA-3, then SPB-1, SPB-2 and SPB-3, with CVS-A and CVS-B beside them. The dashed cut is through SPA-2 only. Note 1 keeps the cabinets at other X positions off the section.

Cabinet, aisle, rails and what is open

Note 2 gives the cabinet on the cut: 800 × 1200 × 2294 mm (48U, 46U usable) on IT support rails. Cabinet height is 2294 mm; its top is at absolute elevation Z3422 (rails top Z1128). 3422 minus 1128 is 2294. The block is labeled SPA-2 and 48U, 800 × 1200 × 2294, and it is marked posts 750. Note 3 reads: rail posts 750 mm apart (NVIDIA SN5xxx rail kit 930-9SKIT-00L0-00A, 600–800 mm, FACT); front post 100 mm behind the front door. The dimension in front of SPA-2 reads cold aisle 2450 (to Y5800 line), and the header states that aisle as 2,450 mm. Subtracting 2,450 from Y5800 lands on Y3350, a line this section prints. Y3350 minus Y2150 is 1200, the middle figure of the cabinet label, and Y2150 is one of the Y lines this section prints. The dimension on the rear side of the block reads rear 1950. Note 4 says IT support rails RHS80×40 at Y1950 / Y3550 (dark blue, top Z1128) carry the cabinets; the 30 mm floor board is not an equipment support. The floor label reads floor-board top Z1030; joists HN250 along X at Y pitch 500 (building geometry). Below the board, marked facility context, are Wet (CDU secondary), Power A and Power B. Note 5 says power and wet channels are below the floor boards. The chilled-water mains are drawn high on the cold-aisle side and marked facility context; this cut gives them no size. The roof main beam is labeled RHS300×150 (Z6854–6966). Note 6 leaves capacity open: roof beams, purlins and tray hangers, to be confirmed by the structural engineer (CONFIRM).

Status

The title block issues the drawing as Public Edition P2, number N-313-EN, sheet 18 of 30, dated 2026-10-05, scale 1:50, units mm. The sheet title is Section C-C: spine cabinet and trunk entry. The status line reads: reference design for study and evaluation — not for construction. The open item on the sheet is note 6: roof beams, purlins and tray hangers, capacity to be confirmed by the structural engineer (CONFIRM). Note 3 marks the rail-kit range 600–800 mm as FACT, on kit 930-9SKIT-00L0-00A. Note 7 states the trunk counts, 120 each for SPA-1..3 / SPB-1..3 and 60 each for CVS-A/B, and it names N-503-EN for that count. The chilled-water mains and the under-floor channels are marked facility context. On the key plan that mark is printed on FW-04, FW-05 and FW-06; FW-03 is the ID only and has no facility-context mark. The sheet is part of the Public Edition P2 network reference design for the GPU hall reference.

Sheet guide — the devices on this drawing

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This sheet is one page of the GPU Hall Network Reference Design — Public Edition P2 (75 pages, 1.6 MB) — a direct PDF download with a published SHA-256 checksum, no registration. The complete coordinated set is on the downloads page. Background guides: data center one-line diagrams · GB300 NVL72 facility requirements · liquid cooling and CDU design.