Construction site power distribution box shells typically range from $100 to $600 depending on size, phase, and material.

Price Overview

• Small single-phase boxes (110V, 20–60A, ABS or plastic shell) are generally priced around $100–$200 for ready-to-use units with basic outlets and circuit protection, as seen on Amazon .
• Medium-duty single-phase or three-phase boxes with metal or fiberglass enclosures, multiple outlets, and higher amperage (up to 125A) usually cost $250–$400, depending on IP rating and customization .
• Heavy-duty or custom three-phase boxes for large construction sites, industrial use, or hazardous environments can range from $400–$600 or more, especially if built to IP65–IP67 standards, with pre-wired internal doors, circuit breakers, and lockable enclosures .

Factors Affecting Price

1. Material: ABS plastic is cheaper, while sheet steel, fiberglass, or thermoplastic cabinets are more durable and expensive .
2. Phase and Load Capacity: Single-phase boxes are lighter and less costly; three-phase boxes for heavy machinery are pricier .
3. Waterproofing and Safety: IP54–IP67 ratings, GFCI/RCD protection, and circuit breakers increase cost .
4. Customization: Custom outlet configurations, internal doors, and pre-wired assemblies can add to the price .
5. Supplier and Shipping: Prices vary by supplier (Amazon, Alibaba, One-Elec, Lowe's) and shipping costs, especially for heavy-duty metal enclosures .

Recommendations

• For small to medium construction sites, a single-phase ABS or fiberglass box around $150–$250 is usually sufficient.
• For large sites or industrial applications, consider a three-phase metal or fiberglass box with IP65–IP67 protection, costing $400–$600.
• Always check for built-in circuit breakers, GFCI protection, and lockable enclosures to ensure safety and compliance with NEC/OSHA standards .

By considering these factors, you can select a power distribution box shell that balances cost, durability, and safety for your construction site needs.