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Dimensions of reserved holes for distribution boxes

Dimensions of reserved holes for distribution boxes

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Dimensions of reserved holes for distribution boxes - BENNIE OPTICAL [PDF]

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Reserved holes for distribution boxes should be approximately 20mm larger than the box dimensions in length and width, with a depth equal to the box thickness plus plastering.

Recommended Hole Dimensions

  • Length and Width: The reserved hole should be about 20mm larger than the distribution box on all sides to allow for proper fitting and adjustments during installation .
  • Depth: The depth of the hole should equal the thickness of the distribution box plus the thickness of the plastering on the inner wall of the hole .
  • Alignment: The box should be installed horizontally and vertically, with a vertical deviation not exceeding 3mm .

Construction Considerations

  • Prefabricated Slots: In modern construction, prefabricated members can be used to create distribution box grooves, reducing the need for chiseling and avoiding damage to lintels or structural elements .
  • Fixing the Box: When embedding the box in masonry, it can be fixed by filling concrete between the box and the wall to ensure stability .
  • Sealing and Protection: Edges around the box should be close to the wall, and contact surfaces should be coated with anti-corrosion paint to prevent damage .

Variations by Box Type

  • Plastic Distribution Boxes: Some boxes, like Polylok models, offer precut holes of 2”, 3”, or 4” (approximately 50–110mm) for pipe connections .
  • Concrete Precast Boxes: Precast concrete boxes may come in 4, 7, 9, or 14-hole configurations, and the reserved hole should accommodate the specific box size .

Practical Tips

  • Ensure the reserved hole allows for easy access to wiring and future maintenance.
  • Verify the box type and manufacturer specifications before finalizing hole dimensions, as different models may have slightly different requirements.
  • Maintain structural integrity by avoiding excessive chiseling around lintels or load-bearing elements . By following these guidelines, reserved holes will provide a secure, accessible, and structurally safe installation for distribution boxes.
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