Hi, that would depend on the installation method and the voltage, as well as the circuit length, accounting for the voltage drop of the circuit.
You may also need to apply correction factors such as for example, ambient temperature; depth and ground TR (if buried) and proximity to other circuits. Reference should be made to Table 4E4A in BS7671 (The UK Wiring Regulations) for base current ratings. Correction factors can also be found in Appendix 4 of said document.
Answered by: Nikki - Prysmian
Date published: 2021-10-15