How to Make a Three-Phase Fuse Box

Written by eric w. thompson
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How to Make a Three-Phase Fuse Box
Three-phase electrical panels require specially rated breakers. (electric panel image by from

Making a three-phase fuse box requires the use of a fuse or breaker box that is specially rated for three-phase power systems. Once assembled, your fuse box must meet strict electrical standards before being passed by your local electrical inspector, so be sure to see your local electrical parts store professionals regarding the right breaker box for your specific needs. In addition, you will need to purchase three-phase breakers in order to complete the job properly.

Skill level:

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Things you need

  • Breaker box
  • Flathead screwdriver
  • Level
  • Marker
  • Hammer drill
  • Masonry bit
  • Threaded anchors
  • Hammer
  • Setting tool
  • Ratchet and socket
  • Three-phase breakers

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  1. 1

    Open the breaker box cover using a flathead screwdriver, then place the box on the mounting wall and position it using a level. Use a marker to trace the mounting holes located on the back wall of the box. For concrete surfaces, drill the mounting holes using a hammer drill and masonry bit. Insert threaded anchors into the holes, then set them using a hammer and a setting tool.

  2. 2

    Place the box against the wall, then align the holes in the box with the holes in the wall; bolt the box in place using a ratchet and socket. Be sure to level the box before tightening completely. Insert the three-phase breaker into one of the slots. Fasten it using a flathead screwdriver.

  3. 3

    Repeat this process for as many breakers as are necessary. The panel should come equipped with power lead terminals and a grounding bar. The three-phase breaker panel is now ready for the power leads, circuits and grounding cables to be installed.

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