Conductors in parallel
From Electrical Installation Guide
Conductors of the same cross-sectional-area, the same length, and of the same material, can be connected in parallel.
The maximum permissible current is the sum of the individual-core maximum currents, taking into account the mutual heating effects, method of installation, etc.
Protection against overload and short-circuits is identical to that for a single-cable circuit.
The following precautions should be taken to avoid the risk of short-circuits on the paralleled cables:
- Additional protection against mechanical damage and against humidity, by the introduction of supplementary protection
- The cable route should be chosen so as to avoid close proximity to combustible materials