| Installation method (Reference table) | PVC insulation (70 °C) | XLPE/EPR (90 °C) | |----------------------------------------|------------------------|-------------------| | – Insulated in thermally insulating wall | 23 A | 29 A | | A2 – Multicore cable in conduit on wall / in thermal insulation | 26 A | 33 A | | B1 – Single‑core in conduit on wall | 23 A (per core) | 29 A (per core) | | B2 – Multicore cable (clipped direct / on tray) | 30 A | 38 A | | C – On wall (clipped direct, free air) | 34 A | 43 A | | E/F – On perforated tray / ladder (free air) | 36 A | 45 A |
This is a concise, technical answer based on (Low‑voltage electrical installations – Selection and erection of electrical equipment – Wiring systems). iec 60364 ampacity 4 mm2 copper