The FRP cable explosion-proof box is a protective enclosure designed to cover high-voltage cable joints, straight splices and terminations. In the event of cable joint insulation breakdown, the box contains the resulting arc, flame and blast energy, preventing injury to personnel and limiting damage to adjacent cables and equipment. Molded from high-strength fiberglass-reinforced polymer, it combines explosion containment with waterproofing, fire resistance and corrosion protection.

Key Features

• Explosion & Arc Containment — High-strength FRP shell and sealed structure contain the pressure, flame and molten material from a joint failure, preventing fault propagation.
• Fire & Flame Retardant — Self-extinguishing FRP material resists burning and limits fire spread along cable routes.
• Waterproof Sealed Design — Gasket-sealed halves and cable entry glands prevent water ingress, suitable for flooded trenches, tunnels and direct burial.
• Corrosion Proof — Fiberglass does not rust or degrade in acidic, alkaline or salt-laden environments.
• High Mechanical Strength — Withstands soil pressure, backfill impact and vehicle loads in direct-burial applications.
• Easy Installation & Inspection — Two-piece clamshell design opens for joint installation and later inspection; stainless steel quick-release fasteners.
• Reusable — Can be opened and re-sealed during joint maintenance, unlike one-off heat-shrink or resin protection.

Specifications

• Material: FRP (fiberglass reinforced polymer), EPDM gaskets, 304 stainless steel fasteners
• Voltage class: 10kV–35kV (110kV on request)
• Protection rating: IP67 / IP68
• Types: Straight joint box, branch joint box, terminations
• Sizes: For cable cross-sections up to 630mm²

Applications Cable joints in trenches, tunnels and direct burial; substation cable entries; industrial and mining cable routes; urban underground utility networks; locations with high safety and fire-protection requirements.

Custom sizes, multi-way branch boxes and fire-resistant fill options are available.