There is no fixed standard for the number of wiring terminals for the neutral wire busbar (N busbar) in the lighting electrical ready board. The core depends on the design load, number of circuits, incoming wire specifications, and wiring method of the electrical ready board. It needs to be reasonably configured according to the actual scenario. The following is a detailed explanation:
The core influencing factor of the number of neutral wire terminals is the number of lighting circuits. For the lighting circuit of a regular household, each independent circuit requires one neutral wire terminal (for connecting the neutral wire of the lamps and switches in this circuit), and 1-2 spare terminals need to be reserved for later circuit expansion or wiring adjustment to avoid wiring confusion caused by insufficient terminals. Secondly, the incoming method will also affect the number of terminals. A single-phase lighting electrical ready board (220V) typically requires one main terminal for one incoming neutral wire. In addition, terminal specifications are associated with the number of terminals in relation to the size of the load. Small size terminals (such as 10A, 16A) are suitable for ordinary lighting circuits (single load ≤ 1000W), and each terminal can be connected to one neutral wire (specifications strictly prohibit multiple wires from being crimped at the same end to avoid poor contact); If the load is large (such as high-power lamps and centralized lighting), large-sized terminals (25A and above) should be selected, and the number of terminals should be reasonably increased according to the number of circuit loads. In the specification requirements, the number of neutral wire terminal blocks must meet the requirement of "1 terminal per circuit+spare terminal", and the total number of terminals must be ≥ the number of lighting circuits+the number of incoming terminals+the number of spare terminals. For example, a single-phase lighting electrical ready board with 10 lighting circuits and 1 incoming line requires the configuration of 12 terminals: 10 (circuits)+1 (incoming lines)+1 (backup); If there are 15 circuits, then 15+1+2=18 terminals are required. It should be noted that the number of neutral wire terminal blocks must comply with electrical specifications, the terminal material must be copper (to ensure conductivity), the wiring must be firm and clearly labeled, and excessive or insufficient terminal vacancies are strictly prohibited to avoid inconvenient maintenance or electrical safety hazards in the later stage. In summary, the number of terminals needs to be calculated based on the actual circuit, incoming lines, and load conditions. The core is to meet usage requirements, reserve expansion space, and ensure safe and standardized wiring. Do you need me to help you calculate the exact number of neutral wire terminal blocks based on the specific number of lighting circuits?