One of the most frequent questions engineers ask before inspecting Cable Ampacity (Ib <= In <= Iz) & Voltage Drop (%ΔU) Verification is: "Which standard should I cite on the certificate, and where do the pass/fail limits come from?" This reference guide maps IEC 60364-5-52 / IEC 60364-4-43 to national regulatory adoptions and provides the complete standard annex tables.
1. National & Regional Standard Equivalence Matrix
| Region / Language | Adopted National Standard & Regulatory Code |
|---|---|
| International / UK (EN) | IEC 60364-5-52 / IEC 60364-4-43 |
| Turkey (TR · Türkçe) | TS HD 60364-5-52 / TS HD 60364-4-43 / İç Tesisler Yön. |
| Germany / DACH (DE · Deutsch) | DIN VDE 0298-4 / DIN VDE 0100-520 / DIN VDE 0100-430 |
| France (FR · Français) | NF C 15-100 §523 & §433 / Guide UTE C 15-105 |
| Spain (ES · Español) | REBT ITC-BT-19 / UNE-HD 60364-5-52 |
| Italy (IT · Italiano) | CEI 64-8 Cap. 52 & 43 / Tabella CEI-UNEL 35024 |
| Gulf / Middle East (AR · العربية) | IEC 60364-5-52 / IEC 60364-4-43 / SASO / DEWA / ADDC |
2. Normative Acceptance Criteria & Mathematical Basis
Deterministically computes IEC 60364-5-52 Table B.52 base current-carrying capacity Iz0 (1.5 - 300 mm2, Cu/Al, PVC 70 degC / XLPE 90 degC, Methods B2, C, E/F, D), exact temperature correction factor Ca = sqrt((theta_max - T_amb)/(theta_max - T_ref)), grouping Cg, overload coordination Ib <= In <= Iz (IEC 60364-4-43 §433.1), and Annex G voltage drop %ΔU.
Iz [A]: n_parallel x Iz0 x Ca x Cg — Derated continuous current-carrying capacity of the installed conductor
Ca: sqrt((theta_max - T_amb) / (theta_max - T_ref)) — IEC 60364-5-52 §523.2 ambient temperature correction factor (theta_max = 90°C XLPE, 70°C PVC)
ΔU [V]: b x L x (Ib / n) x [(rho / S) cos(phi) + lambda sin(phi)] — IEC 60364-5-52 Annex G voltage drop (b = sqrt(3) 3-phase, b = 2 single-phase)
3. Official Standard Reference Tables
IEC 60364-5-52 Reference Base Ampacity Iz0 (A) — 3 Loaded Copper Conductors at 30 °C Air (IEC 60364-5-52 Tables B.52.3 / B.52.5 / B.52.12)
| Cross-Section S (mm2) | Cu XLPE 90°C Method E (Tray) | Cu PVC 70°C Method E (Tray) | Cu XLPE 90°C Method B2 (Conduit) |
|---|---|---|---|
| 2.5 mm2 | 31 A | 25 A | 24 A |
| 4 mm2 | 42 A | 34 A | 33 A |
| 6 mm2 | 54 A | 43 A | 42 A |
| 10 mm2 | 75 A | 60 A | 59 A |
| 16 mm2 | 100 A | 80 A | 78 A |
| 35 mm2 | 158 A | 126 A | 123 A |
| 70 mm2 | 246 A | 196 A | 192 A |
| 120 mm2 | 346 A | 276 A | 270 A |
| 240 mm2 | 538 A | 430 A | 420 A |