Level 3 distribution boxes are the final junction boxes in a three-level electrical distribution system on construction sites. They are installed under the main distribution and secondary boxes and can be either movable or fixed. Each Level 3 box connects directly to the leakage protection switch, ensuring that each electrical appliance has dedicated protection. This setup follows the principle of “one machine, one switch, one leakage, one box, one lock”, preventing multiple devices from being controlled by the same switch and enhancing safety .
Site Selection:
Level 3 distribution boxes must comply with construction electricity standards and local electrical codes. Use certified components (UL, CE, or equivalent) and follow a three-level protection system: main distribution box, secondary box, and Level 3 box, achieving one machine, one switch, and one protection .
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