What type of cable should be used in the distribution box

Low-voltage, flexible copper or aluminium cables with appropriate insulation are typically suitable for distribution boxes. Recommended Cable TypesLow-voltage (LV) cables are most commonly used in distribution boxes for residential and light commercial applications, typically rated up to 750–1000 V AC or 75–1500 V DC. These cables are designed to safely carry electricity from the main supply to individual circuits within the box.

Conductor Material: Copper is preferred due to its high conductivity, low resistivity, and flexibility, making it easier to route inside the box. Aluminium can also be used but requires a larger cross-section to match copper's conductivity. Conductor Construction: Solid conductors (Class 1): Suitable for fixed installations with minimal bending.

Stranded conductors (Class 2 or Class 5): Provide flexibility, ideal for tight spaces or where frequent bending is required. Insulation and Sheathing: PVC or thermoplastic insulation is common for indoor distribution boxes. Low-smoke, halogen-free (LSZH) cables are recommended in public or high-safety areas to reduce toxic fumes in case of fire.

Armoured cables may be used if the installation is exposed to mechanical stress or potential rodent damage.

Installation Considerations

Ensure the cable size matches the current load of the circuits to prevent overheating. Maintain proper bending radius to avoid damaging insulation. Use single-conductor cables for easier splicing and multiple-circuit arrangements, or three-conductor cables for balanced voltage distribution.

For industrial or outdoor distribution boxes, consider cables with additional protection against moisture, dust, or vibration.

Summary

For a standard distribution box, flexible low-voltage copper cables with appropriate insulation are generally suitable. In environments with higher safety requirements or mechanical risks, armoured or LSZH cables may be preferred. Proper conductor sizing, insulation type, and installation practices are essential to ensure safe and reliable operation.