The selection of the rated current for the lighting circuit breaker in the lighting electrical Ready Board Box cannot be generalized. It needs to be comprehensively determined based on the total power of the lamps connected to the circuit, the wire diameter, and the starting characteristics. 6A, 10A, and 16A are common choices, with specific application scenarios as follows:
6A: Applicable to circuits with lower loads and fewer lighting fixtures, such as secondary bedrooms and study rooms in ordinary residences, or small spaces with only a few downlights. At 230V, 6A corresponds to a load capacity of approximately 1320W. Although its load capacity is relatively small, as a dedicated lighting protection device, it boasts the highest sensitivity and provides better overload and short-circuit protection. It is currently a trend in refined decoration and standardized design.
10A: It is the most conventional and versatile choice. With a corresponding load capacity of approximately 2200W, it can cover the lighting of one area in most ordinary households (such as all lighting fixtures in the living room and balcony), and is also commonly used in standard lighting circuits of public buildings such as office buildings. It is usually used with 1.5mm² or 2.5mm² copper core conductors.
16A: It is typically used for high-power lighting loads, or in situations where a single circuit integrates multiple light strips or a large number of spotlights. Its load capacity is approximately 3520W, but it is prerequisite to use conductors of 2.5mm² or larger. It should be noted that if a large number of LED lamps are used in the circuit, despite their low steady-state power, some inferior driver power supplies may exhibit high surge currents. In such cases, selecting 16A can prevent frequent false trips.
Core matching principle:
The rated current of the circuit breaker must be less than the long-term current-carrying capacity of the wire. Generally:
To protect a 1.5mm² copper wire, the circuit breaker should be selected as 10A (or 6A);
To protect a 2.5mm² copper wire, a circuit breaker with a rating of 16A (or 10A) can be selected.
Summary of suggestions: For general household or office lighting, 10A (with 1.5mm² or 2.5mm² wire) is the preferred choice; if there are very few lighting fixtures in the circuit (such as in bathrooms or storage rooms), 6A is safer; if it is a large space (such as a high-ceilinged living room in a villa) with centralized control of a large number of lighting fixtures, 16A should be selected and ensure that the wire diameter is sufficient.