Leading LT Bus Duct Manufacturer in Ahmedabad, Gujarat

What is an LT Bus Duct / Sandwich Bus Duct?

A Low-Tension (LT) Bus Duct — also called a Sandwich Bus Duct — is a factory-assembled, enclosed power distribution system used for transmitting large amounts of electrical energy at low voltage (up to 1100V AC) within industrial plants, commercial facilities, and power generation units. Unlike traditional cable-based systems, an LT Bus Duct uses pre-fabricated aluminium or copper busbars sandwiched between insulating layers and enclosed in a metallic housing. This sandwich-like construction gives it the name “Sandwich Bus Duct.” The result is a compact, high-capacity, low-maintenance power distribution system that is significantly more efficient and safer than conventional cable trays and conduit systems. LT Bus Ducts are manufactured to IEC 61439 and IS standards and are available in current ratings from 400A to 6300A, making them suitable for everything from small commercial buildings to large-scale solar power plants and industrial facilities.

Types of LT Bus Ducts We Manufacture

Sandwich Bus Duct

The sandwich bus duct is the most widely used type of LT bus duct. Aluminium or copper conductors are sandwiched between insulating layers and enclosed in an aluminium or mild steel housing. Offers excellent short-circuit withstand capacity, low impedance, and high current-carrying efficiency. Available from 400A to 6300A current ratings. Used in power distribution from LT switchboards to distribution boards across industrial and commercial facilities.

Rising Main Bus Duct

Rising main bus ducts are designed for vertical power distribution in multi-storey buildings — transmitting power upward from the basement switchroom to each floor. Compact cross-section saves valuable shaft space. Available with tap-off boxes at each floor level for controlled power take-off. Widely used in commercial towers, hospitals, hotels, and data centers.

Feeder Bus Duct

Feeder bus ducts carry high-capacity power in a straight run from the main transformer or switchgear to the main LT panel or distribution board. Designed for maximum current-carrying capacity with minimum voltage drop. No tap-off points — power flows directly from source to load. Suitable for transformer-to-panel connections in industrial plants and power generation facilities.

Plugin Bus Duct

Plugin bus ducts incorporate tap-off points at regular intervals, allowing power to be tapped off at any point along the duct run. Ideal for production floors in factories where machines and equipment need power at multiple points. Eliminates the need for separate sub-distribution boards. Flexible, scalable, and reduces overall installation costs significantly.

LT Bus Duct Technical Specifications

Voltage Rating: Up to 1100V AC (LT Systems) Current Rating: 400A to 6300A Conductor Material: Electrolytic Grade Copper / Aluminium (EC Grade) Enclosure Material: Aluminium / Mild Steel (powder coated) Insulation: XLPE / Epoxy / Air-insulated Ingress Protection: IP54 / IP55 (outdoor versions available) Short Circuit Rating: Up to 100kA for 1 second Temperature Rise: As per IS/IEC 61439 (≤ 55K above ambient) Busbar Configuration: 3-phase 3-wire / 3-phase 4-wire / 3-phase 5-wire (with PE) Standard Compliance: IS 8084 / IEC 61439-6 Joints: Bolted silver-plated compression joints Available Accessories: Elbows, T-junctions, cross-junctions, expansion joints, flexible sections, tap-off boxes, end caps Custom Lengths: Available — manufactured to project specifications

Applications of LT Bus Duct

Solar Power Plants & Renewable Energy

LT bus ducts are increasingly used in solar power plants for transmitting power from the inverter room to the main LT panel, from the LT panel to the step-up transformer, and within switchgear rooms. Their compact footprint and high current-carrying capacity make them ideal for solar plant control rooms and inverter rooms where space is limited. Starlite Renewables — as a dedicated solar BOS equipment manufacturer — designs LT bus duct systems specifically for solar PV plant applications.

Industrial Facilities & Manufacturing Plants

Factories, production plants, refineries, and chemical plants use LT bus ducts extensively for power distribution across production floors. Plugin bus ducts allow machines to be powered at any point along the distribution run — eliminating the need for multiple sub-distribution boards and reducing cable clutter. Ideal for automobile plants, food processing facilities, textile mills, and steel plants.

Commercial Buildings & Data Centers

Large commercial buildings — including IT parks, shopping malls, hospitals, hotels, office towers, and data centers — use rising main bus ducts for vertical power distribution and feeder bus ducts for horizontal distribution. Bus ducts reduce installation time significantly compared to cable trays and provide a clean, maintenance-friendly power distribution system for facilities where uptime is critical.

Power Generation Units

Bus ducts are used in power plants for high-current connections between generators, transformers, and switchgear. Their high short-circuit withstand capacity and low impedance make them the preferred choice over cables for critical, high-power connections in power generation facilities, captive power plants, and diesel generator sets.

Key Features & Advantages of LT Bus Duct

✅ High Current Capacity LT bus ducts carry up to 6300A continuously — far beyond the practical limits of conventional cables. A single bus duct replaces multiple large-diameter cable runs, simplifying installation and reducing cost. ✅ Low Voltage Drop & High Efficiency The low-resistance, low-impedance design of bus ducts minimises voltage drop along the distribution path — improving power quality and reducing energy losses compared to cable systems. ✅ Compact & Space-Saving A bus duct occupies significantly less space than equivalent cable systems. In facilities where cable trays consume large amounts of ceiling or floor space, bus ducts provide the same or higher capacity in a fraction of the space. ✅ Faster Installation Pre-fabricated and modular by design, bus ducts arrive on site ready to install. Sections bolt together quickly, and standard accessories — elbows, T-joints, flexible sections — handle any site geometry without custom fabrication. ✅ Excellent Short-Circuit Protection Bus ducts are designed to withstand high short-circuit currents (up to 100kA for 1 second) without damage — providing inherent protection for the distribution system and connected equipment. ✅ Low Maintenance Enclosed busbar systems have far fewer failure points than open cable systems. No cable degradation, no insulation breakdown from moisture, no damage from rodents. Periodic joint inspection is all that’s required. ✅ Fully Customisable Starlite Renewables manufactures LT bus ducts to project-specific dimensions, current ratings, and configurations. Custom elbows, tap-off positions, IP ratings, and conductor materials are available on request. ✅ IEC & IS Certified All LT bus ducts manufactured by Starlite Renewables are designed and tested to IS 8084 and IEC 61439-6 standards for low-voltage switchgear and bus duct systems.

Why Choose Starlite Renewables for LT Bus Duct?

Starlite Renewables is a trusted B2B manufacturer of solar BOS equipment and industrial electrical systems, including LT Bus Ducts and Sandwich Bus Ducts, from our manufacturing facility in Rajkot, Gujarat. With over 300 B2B clients across India and internationally — including Hero MotoCorp, Hinduja Renewables, Premier Energies, and Jakson Group — we bring the same commitment to quality, certification, and technical excellence to every LT bus duct project. Our engineering team works closely with project consultants, EPC contractors, and electrical contractors to design bus duct systems that meet exact project specifications — from current rating and busbar material to IP protection and tap-off requirements. We supply LT bus ducts for: – Solar power plant inverter rooms and switchgear rooms – Industrial plants and manufacturing facilities – Commercial buildings and IT parks – Hospitals, hotels, and data centers – Captive power plants and DG sets

Frequently Asked Questions — LT Bus Duct

Q: What is the difference between LT Bus Duct and Sandwich Bus Duct? A: LT Bus Duct is the general term for any low-tension (low-voltage) busbar distribution system. Sandwich Bus Duct is a specific type of LT bus duct where the conductors are sandwiched between insulating layers and enclosed in a metallic housing — giving it the name “sandwich.” Sandwich bus ducts are the most common type of LT bus duct used in commercial and industrial applications in India. All sandwich bus ducts are LT bus ducts, but not all LT bus ducts are sandwich-type. Q: What current ratings are available for LT Bus Duct? A: Starlite Renewables manufactures LT bus ducts in current ratings from 400A to 6300A. The most common ratings are 800A, 1000A, 1600A, 2000A, 2500A, 3200A, and 4000A for industrial and commercial applications. Custom ratings are available based on project requirements. Q: What is the maximum voltage rating for LT Bus Duct? A: LT Bus Ducts are designed for low-voltage systems — up to 1100V AC, 50/60Hz. They are used in LT power distribution systems fed by transformers or generators operating at 415V (3-phase) or 240V (single-phase) in India. For higher voltage applications, HT Bus Ducts (Medium Voltage) are used. Q: Copper vs Aluminium busbars — which is better? A: Copper busbars offer higher current-carrying capacity per unit cross-section, better conductivity, and lower resistance than aluminium — making them the preferred choice for high-current, space-critical applications. Aluminium busbars are lighter, less expensive, and sufficient for most standard commercial and industrial applications. Starlite Renewables offers both copper and aluminium options based on your project requirements and budget. Q: What standards are LT Bus Ducts manufactured to? A: All LT bus ducts by Starlite Renewables are manufactured and tested to IS 8084 (Indian Standard for bus ducts) and IEC 61439-6 (International Standard for busbar trunking systems). Type testing certificates available on request. Q: Can LT Bus Ducts be used outdoors? A: Standard LT bus ducts are rated IP54 for semi-protected outdoor locations. For fully exposed outdoor installations, IP55 or higher rated bus ducts with weatherproof enclosures are available. Starlite manufactures outdoor-rated bus duct systems for solar power plant applications. Q: What is the lead time for LT Bus Duct manufacturing? A: Standard LT bus duct orders are typically completed in 3–6 weeks from drawing approval, depending on current rating, length, and configuration. Express delivery available for standard configurations. Contact us at sales@starliterenewables.com or +91-8839388526 for project-specific timelines. Q: Do you supply LT Bus Duct installation and commissioning? A: Starlite Renewables is a B2B manufacturer — we supply the bus duct system including all accessories, joints, and documentation. Installation and commissioning is carried out by the customer’s electrical contractor or EPC team. Our engineering team provides full technical support, drawings, and installation guidance.