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Distance between distribution boxes and main distribution boxes

Distance between distribution boxes and main distribution boxes

The distance between a distribution box and a main distribution box should generally not exceed 30 meters, with switch boxes located within 3 meters of the equipment they control.Recommended DistancesMain Distribution Box to Distribution Box: The main distribution box should be installed close to the power source, while distribution boxes should be placed near areas with concentrated electrical loads. The distance between a distribution box and the main distribution box should not exceed 30 meters to minimize line losses and maintain efficient power distribution .Distribution Box to Switch Box: Switch boxes, which control specific equipment, should be installed within 30 meters of the distribution box supplying them. The horizontal distance between a switch box and the fixed electrical equipment it controls should not exceed 3 meters . This ensures quick response, reduces voltage drop, and improves operational efficiency.Installation ConsiderationsEnvironment: Distribution boxes should be installed in dry, ventilated, and normal-temperature locations, avoiding areas with harmful gases, moisture, vibration, or heat sources .Accessibility: Sufficient space should be provided around the boxes for two people to work simultaneously, ensuring safe maintenance and operation .Load Concentration: Distribution boxes should be strategically placed near clusters of high-power equipment to minimize cable length and energy loss .Height and Ergonomics: For wall-mounted boxes, the bottom surface is typically 1.2–1.5 meters above the ground, allowing comfortable access for routine operations .SummaryMaintaining these distances ensures efficient power distribution, safety, and compliance with electrical standards. The 30-meter guideline for distribution boxes and the 3-meter guideline for switch boxes are widely recommended in construction and industrial electrical installations . Proper placement also reduces line losses, simplifies maintenance, and enhances overall system reliability.

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The distribution box shall be set below the main distribution box, and the switch box shall be set below the distribution box, and the electrical equipment shall be set below the switch box.

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The main distribution box shall be close to the power supply. The distribution box shall be installed in the area where the electric equipment is

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