| Standard Enclosed Cable Branch Box | Polycarbonate, ABS, stainless steel, or painted steel enclosure with cable glands, terminals, or bolted connections. | Up to 1,000 V AC
Commonly 16–630 A | Indoor electrical rooms, commercial buildings, factories, and protected outdoor areas. | IP54–IP66
Depending on enclosure and cable-entry design. | Low-voltage power distribution, lighting circuits, machinery supplies, and building services. | Flexible configuration, easy inspection, broad availability, and relatively simple maintenance. | Verify conductor size, terminal capacity, short-circuit withstand rating, temperature rise, and enclosure material. |
| Resin-Filled Waterproof Cable Branch Box | Polyamide, polycarbonate, or reinforced enclosure filled with two-part insulating resin after cable connection. | Up to 1,000 V AC
Commonly 16–400 A | Underground installations, wet areas, outdoor utility networks, irrigation systems, and marine-adjacent locations. | IP68
When correctly assembled and fully cured. | Submersible or flood-prone cable joints, buried distribution, landscape power, and outdoor infrastructure. | Excellent water resistance, strong mechanical support, and reliable insulation around connections. | Connection quality cannot normally be changed after filling; observe resin mixing, curing temperature, and working time. |
| Gel-Filled Cable Branch Box | Reusable or semi-reusable enclosure containing insulating gel around the cable joints and terminals. | Up to 1,000 V AC
Commonly 10–250 A | Outdoor lighting, garden systems, temporary works, low-voltage control, and damp indoor locations. | IP68
Subject to the complete assembly and cable-entry system. | Fast field installation, maintenance-friendly branch connections, and low-voltage service networks. | Quick installation, good moisture displacement, and easier re-entry than resin-filled systems. | Check gel compatibility with cable insulation, operating temperature, mechanical protection, and long-term UV exposure. |
| Modular Terminal Cable Branch Box | Modular insulated enclosure using DIN-rail terminals, disconnect terminals, fuse holders, or circuit protection devices. | Up to 1,000 V AC
Commonly 10–250 A | Control panels, industrial automation systems, building service panels, and equipment skids. | IP40–IP66
Based on the enclosure and installed cable glands. | Control and instrumentation wiring, machine distribution, auxiliary circuits, and organized cable branching. | Clear circuit identification, easy testing, replaceable components, and simple future expansion. | Allow space for heat dissipation and bending radius; confirm terminal voltage, current, and conductor compatibility. |
| Underground and Manhole Cable Branch Box | Heavy-duty polymer, glass-reinforced plastic, or corrosion-resistant metal enclosure with compression seals. | Up to 1,000 V AC
Commonly 63–630 A | Utility trenches, road infrastructure, underground chambers, transport facilities, and external distribution routes. | IP67–IP68
With resistance to water ingress during temporary or continuous immersion as specified. | Street lighting, public infrastructure, underground feeders, EV charging distribution, and site utilities. | Designed for moisture, soil contact, limited access, and mechanical service conditions. | Assess flood level, external pressure, impact resistance, corrosion, drainage, maintenance access, and cable pulling forces. |
| Fire-Resistant and Fire-Barrier Cable Branch Box | Metal or certified fire-resistant enclosure using heat-resistant terminals, barriers, and fire-sealing cable entries. | Up to 1,000 V AC
Current rating depends on terminals and enclosure design. | High-rise buildings, emergency systems, tunnels, transport facilities, and safety-critical installations. | IP54–IP66
Fire performance is specified separately from ingress protection. | Emergency lighting, smoke control, fire pumps, evacuation systems, and safety power circuits. | Supports circuit integrity and limits flame or heat transfer when used within a tested system. | Do not rely on IP rating alone; verify fire-resistance duration, cable type, mounting method, and applicable local regulations. |
| Hazardous-Area Cable Branch Box | Certified flameproof, increased-safety, or dust-protected metal or reinforced polymer enclosure with certified cable glands. | Commonly up to 1,000 V AC
Current and voltage depend on certification. | Refineries, chemical plants, fuel storage areas, mining sites, and locations with combustible dust or gas. | IP54–IP66
Must also meet the required hazardous-area protection concept. | Branching power and control cables in potentially explosive atmospheres. | Provides controlled protection against ignition risks when correctly certified and installed. | Match equipment marking to the zone, gas or dust group, temperature class, ambient temperature, and cable-entry method. |
| Monitored or Smart Cable Branch Box | Sealed or modular enclosure with current sensors, voltage measurement, temperature sensing, or communication modules. | Typically up to 1,000 V AC
Measurement range depends on sensors. | Data centers, renewable-energy sites, industrial plants, smart buildings, and distributed infrastructure. | IP54–IP66
Depending on enclosure and communication hardware. | Load monitoring, fault indication, energy measurement, predictive maintenance, and remote asset management. | Improves visibility of branch-circuit loading, temperature trends, and abnormal operating conditions. | Confirm measurement accuracy, auxiliary power, cybersecurity requirements, communication protocol, data retention, and electrical isolation. |
| Busbar-Based Cable Branch Box | Insulated enclosure containing a copper or aluminum busbar system with plug-in, bolted, or fused outgoing connections. | Up to 1,000 V AC
Commonly 100–1,600 A | Large commercial buildings, factories, data centers, warehouses, and high-density distribution systems. | IP31–IP55
Higher ratings require suitable enclosure and joint protection. | High-capacity feeder branching, production lines, busbar trunking interfaces, and centralized power distribution. | High current density, orderly expansion, reduced cable congestion, and easier load balancing. | Check busbar short-circuit withstand, temperature rise, connection torque, clearances, and compatibility with the upstream system. |
| Solar and Renewable-Energy Cable Branch Box | UV-resistant polymer or metal enclosure with DC-rated terminals, fuses, isolators, surge protection, and cable glands. | Commonly up to 1,500 V DC
Current depends on string and feeder configuration. | Rooftop solar installations, ground-mounted photovoltaic arrays, battery sites, and renewable-energy facilities. | IP65–IP68
For outdoor exposure when properly installed. | Combining photovoltaic strings, DC cable branching, surge protection, and array-level isolation. | Supports outdoor DC distribution and can integrate protection and isolation in one enclosure. | Use components specifically rated for DC switching and photovoltaic service; consider polarity, arc risk, UV exposure, and thermal derating. |
