To install expansion bolts in a distribution box, mark the mounting points, drill appropriately sized holes, insert the expansion bolts, and securely fasten the box to ensure stability and level alignment.

Step-by-Step Installation

1. Prepare Tools and Safety Gear Gather an electric drill, screwdriver, wrench, level, marking pen, and the correct size expansion bolts. Wear personal protective equipment such as insulating gloves, safety glasses, and slip-resistant shoes to ensure safety during installation . 2. Choose and Mark the Installation Location Select a dry, accessible, and well-ventilated area. Use a level to mark the horizontal line and the exact points where the expansion bolts will be inserted. Ensure the marks align with the mounting holes of the distribution box . 3. Drill Holes Using an electric drill, create holes at the marked points. The hole diameter and depth should match the specifications of the expansion bolts. Drill carefully to avoid cracking or damaging the wall surface . 4. Insert Expansion Bolts Knock the expansion bolts into the drilled holes. Make sure they are flush with the wall and properly seated. Expansion bolts expand inside the wall to provide a secure anchor . 5. Mount the Distribution Box Align the distribution box with the installed expansion bolts. Place the box onto the bolts and tighten the screws or nuts with a wrench. Ensure the box is level, stable, and free from any tilt or looseness . 6. Wiring and Internal Connections After securing the box, strip the insulation from wires to the appropriate length and connect them to the correct terminals: phase to phase, neutral to neutral, and ground to ground. Use a wire stripper or screwdriver to ensure tight connections. Arrange wires neatly and secure with cable ties, leaving space for heat dissipation . 7. Final Checks Verify that the box is firmly mounted and level. Perform insulation resistance tests and check circuit continuity to ensure safe operation. Label circuits for future maintenance and troubleshooting . Tips:

• For outdoor installations, use waterproof expansion bolts and a rain cover to prevent water ingress .
• Avoid over-tightening screws to prevent deforming the box shell .
• Always follow local electrical codes and standards for safety . By following these steps, your distribution box will be securely mounted, safe, and ready for reliable electrical operation.