Sheet E-314: How 32 Bottom-Entry Conductors Sit in Two Tray Tiers, and What the Clamp Notes Leave Open

What this sheet shows

E-314 is the cross-section titled transformer bottom entry. The view heading reads A-A, 32 single conductors, two straight tray tiers, model enlargement 5x, and the sheet states that its dimensions are in mm. The sheet line names the conductors as 1000 kcmil Al. Eight clamps are drawn: SET 1 through SET 4 on the upper tier and SET 5 through SET 8 on the lower tier. In every clamp the upper row is labeled B and N and the lower row A and C, so SET 1 reads B1 and N1 over A1 and C1, and SET 8 reads B8 and N8 over A8 and C8. A PE is labeled outside the clamps, to the left of SET 1 and again to the left of SET 5. The view title says 32 single conductors. The note beside it counts 24 phases and 8 provisional full-size neutrals, and the next line says each conductor is 1000 kcmil Al, with the PE separate.

Widths, pitch and the cover stack

The caption under the section reads 600 net / 700 outer, and a 400 tier pitch. The lower tier carries 600 and 700 as the horizontal dimensions, and 135 and 150 as vertical dimensions at the left. Between the tiers the section dimensions 225. The notes name that 225 as the distance between the lower cover and the upper tray bottom, and they give both tiers as elevations. Upper: bottom 250 / bearing 270 / cover 420..425. Lower: bottom -150 / bearing -130 / cover 20..25. A further line places support plane 450 at 25 from the upper cover top. The cover stops outside the equipment enclosure footprint. Lined up with those elevations, the 150 is the clear distance from the bearing to the cover, the 400 is the pitch from tray bottom to tray bottom, and the 225 is the gap the note names from the lower cover to the upper tray bottom.

Clamp reserve, tool access and the fan-in end

The clamp is given as a candidate body, CMP 80W x 115H x 58L. The installation reserve is written 135H = 115+10+10. The next line is 150 clear to the removable cover, with 15 spare, and the line after that states that the 15 clearance is not tool-working space. The sheet then says to remove the cover for clamp and bolt tool access. The 135 inside the 150 on the lower tier are those two heights. Cable seats and the mounting pattern are supplier interface S1. The clamp envelope is shown; the hole pattern is to match the selected OEM clamp. B-B is the fan-in end, labeled X2100, at model enlargement 3x, and titled no ordinary side rail. It draws four clamps in a row. The spacing note reads 90 centres / 80 envelope / 10 side gap, and the detail dimensions the 80 and the 10. The body is repeated there as 80 x 115, depth 58. The grouping note says parallel ABCN sets stay together, with no cross-layer mix: SET 1 through SET 4 are drawn entirely on the upper tier, and SET 5 through SET 8 entirely on the lower.

Status

Published at Design Development — Public Edition P1 (title block: 2026-09): a reference design for study and evaluation, with the open items written on the sheet. The neutrals are called provisional full-size neutrals. The drawn circle is a D35 geometry envelope, and actual OD31.19 is labeled a candidate. The clamp body is a candidate. Its seats and mounting pattern are supplier interface S1, the hole pattern is to match the selected OEM clamp, and the fan-in view says to confirm OEM interfaces for the seats and bolts. The electrical and thermal basis is named as cable ampacity and installation calculations. No ampacity figure is printed. The note says to verify installed ampacity for the illustrated cable grouping, cover arrangement and terminations.

Sheet guide — the devices on this drawing

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