5.1 Rack dimensions
One HP shall be 5.08 mm (RACK-001) and one rack unit shall be 44.45 mm (RACK-002), quoted from IEC 60297-3-101:2004. Both bind modules and enclosures.
A rack-mount frame, one that fastens into a 19-inch rack, shall meet IEC 60297-3-101:2004 and IEC 60297-3-100:2008 for the flange width, the flange mounting-hole positions and slot, the 3U height H1, and the 84 HP row width (RACK-003). A desktop or portable case needs no flanges; its rows keep the same HP, rack unit, and mounting-hole span (PANEL-009).
The figures RACK-003 applies:
| Quantity | Value | Source |
|---|---|---|
| Panel width over mounting flanges | 482.6 mm, ±0.4 mm | IEC 60297-3-101:2004, Figure 3; IEC 60297-3-100:2008, Figure 2 |
| Mounting-hole centers across flanges | 465.1 mm | IEC 60297-3-100:2008, clause 6.2 rack mounting grid |
| Mounting hole from outer edge | 8.75 mm | derived |
| Mounting-hole vertical steps | 12.7 mm and 31.75 mm | IEC 60297-3-100:2008, clause 6.2 rack mounting grid |
| 3U flange mounting-hole span H2 | 57.15 mm | IEC 60297-3-100:2008, Table 1 |
| 3U flange hole from each end H3 | 37.70 mm | IEC 60297-3-100:2008, Table 1 |
| Oval mounting slot | 6.8 mm high, 14.7 mm deep | IEC 60297-3-100:2008, detail A |
| 3U front panel and subrack height H1 | 132.55 mm, ±0.4 mm | IEC 60297-3-100:2008, Table 1 |
| 19-inch row width | 84 HP | IEC 60297-3-101:2004, Figure 3 (84 × 5.08 mm) |
| Three rack units | 133.35 mm | 3 × 44.45 mm |
| Mounting flange, each side | narrower than 27.94 mm | (482.6 − 84 × 5.08) / 2 |
IEC 60297-3-100 applies H1, H2, and H3 to front panels, chassis, and subracks alike (its clause 5.1). Its detail A draws the slot as an oval open at the outer edge, 6.8 mm high (+0.5 / 0) and 14.7 mm deep (±1.2), and also permits a second hole type; the figure draws the open oval.
A front panel sits within H1, between the rails. The IEC publications do not set rail depth; 5.3 gives the recommended section.
The figures are in data/standards.json. The panel and flange figures (482.6 mm, H1, H2, H3, detail A, 1U, 84 × 5.08 mm) are read from the publications' own pages in the IEC's public preview: IEC 60297-3-100:2008 clause 5, Figure 2, and Table 1, and IEC 60297-3-101:2004 Figures 3 and 5 (bibliography). The rack mounting grid (465.1 mm centers, 12.7 mm and 31.75 mm steps) is in IEC 60297-3-100:2008 clause 6, beyond the preview, and is transcribed from the Schroff standards summary; where the two differ, the publication governs. The IEC publications are not stored in this repository.