Question 1

What is the maximum MCB size for a single-phase residential connection in Nepal?

Accepted Answer

For standard residential single-phase (220V) connections in Nepal, the maximum recommended sub-circuit MCB is 32A. If a room or house requires more than 32A continuously, the load should be split across multiple circuits, or a 3-phase supply should be requested from the NEA.

Question 2

How do I choose the correct wire size for an MCB?

Accepted Answer

Wire size is based on the MCB rating. Generally: 6A uses 1.0 sq.mm, 10A uses 1.5 sq.mm, 16A uses 2.5 sq.mm, 20A/25A uses 4.0 sq.mm, and 32A uses 6.0 sq.mm standard copper PVC cable.

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