Which type of wire is recommended for heavy current carrying in main distribution boards?
Single core wire
In wiring practice a conductor's ability to carry current without overheating depends on its cross-sectional area, its continuity and its resistance, so heavy-duty positions demand a solid, low-resistance conductor.
A main distribution board is the point where the full incoming load of an installation is received and split among sub-circuits, so the wire feeding and bussing it must handle the largest current in the system.
A single core wire is one solid conductor of large cross-section; its uninterrupted metal path gives high current-carrying capacity, low resistance and the mechanical rigidity needed for fixed, tightly clamped runs on a board.
Twin flexible wire and ordinary flexible wire are built from many thin strands for bending ease and are sized for portable appliances and pendant drops, not for sustained heavy load, so they would heat up.
Multi-strand bell wire is thinner still, intended for low-current signalling and bell circuits, and has nowhere near the ampacity required at a distribution board.
Because the board must carry the concentrated heavy current safely and stay mechanically secure, the solid large-section conductor is the recommended choice.
Hence, the answer is Single core wire.
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