The primary distribution box for a prefabricated house is typically installed close to the house, often within a few meters, ensuring safe, accessible, and code-compliant wiring.

Typical Placement

For prefabricated homes, the distribution box (electrical panel) is usually located either inside the house—in a utility room, basement, or garage—or mounted outside near the electrical meter . The exact distance from the house depends on local building codes, the type of prefab home, and the layout of the electrical service. In most cases, the box is positioned as close as possible to the point where the utility service enters the home to minimize voltage drop and reduce the length of wiring runs .

Installation Considerations

• Accessibility: The box should be installed in a dry, accessible area with good ventilation, typically at a height of around 1.5 meters for easy operation and maintenance .
• Safety: Proper placement ensures compliance with NEC or local electrical codes, reducing the risk of short circuits, fire hazards, or system failure .
• Environmental Protection: Outdoor boxes should have appropriate IP or NEMA ratings to protect against water, dust, and corrosion, especially in regions with extreme weather conditions .
• Wiring Efficiency: Shorter distances between the distribution box and the house reduce material costs and improve electrical efficiency, particularly for high-load circuits .

Practical Guidelines

• In North America, prefab homes often use pre-wired, plug-and-play distribution boxes installed near the meter or utility entry point, typically within 1–3 meters of the house wall .
• For outdoor installations, ensure the box is mounted on a stable surface, away from direct water exposure, and within reach for maintenance .
• Always follow local electrical codes and manufacturer recommendations for the specific prefab model, as distances and installation requirements may vary by region and utility provider . In summary, while there is no fixed universal distance, the primary distribution box should be installed as close as practical to the prefabricated house, ensuring safety, accessibility, and compliance with electrical standards. Proper placement also facilitates efficient wiring and long-term reliability of the electrical system.