LT Bus Ducts
POLARIS LT Bus Ducts are engineered power distribution systems that replace conventional cabling for transmitting large electrical currents between transformers, PCC Panels, switchgear, and distribution boards in industrial environments. Bus ducts offer a compact, low-loss, and highly reliable alternative to cable-based power distribution — particularly where current ratings exceed practical cable bundling limits or where installation space is constrained. POLARIS LT Bus Ducts are fabricated with high-conductivity electrolytic copper or aluminium conductors insulated with heat-resistant material and housed in ventilated or non-ventilated sheet steel enclosures. Every bus duct system is designed for the specific current rating, voltage level, short-circuit withstand, and installation route of the project.
Key Features
- High-current power transmission between transformers, PCC Panels, and switchgear with minimal losses.
- Available in copper or aluminium conductor options with heat-resistant insulation.
- Ventilated, non-ventilated, and segregated phase designs for different environmental conditions.
- High short-circuit withstand capacity for safe operation under fault conditions.
- Compact installation footprint compared to multi-cable systems in the same current range.
- Tap-off box provisions for drawing power at intermediate points along the bus duct run.
- Expansion joints for thermal expansion compensation in long bus duct runs.
- IP42 or higher protection level enclosures suitable for indoor industrial environments.
- Flexible end connections for easy alignment with transformer LV terminals and panel busbars.
- Designed per IS 8084 and IEC 61439 standards with factory testing for temperature rise.
Frequently Asked Questions
What is an LT Bus Duct and when should it be used instead of cables?
An LT Bus Duct is a prefabricated metal-enclosed conductor system used for high-current power distribution. It should be used instead of cables when the current requirement exceeds 1600A, installation space is limited, or a cleaner and more maintainable distribution system is needed between a transformer and main panels.
What conductor materials are available in POLARIS LT Bus Ducts?
POLARIS LT Bus Ducts are available with electrolytic-grade copper conductors for highest conductivity and aluminium conductors for cost-effective solutions. The conductor cross-section is selected based on the current rating and short-circuit withstand requirements of the system.
What current ratings are available for POLARIS LT Bus Ducts?
POLARIS manufactures LT Bus Ducts in current ratings ranging from 800A to 6300A and above, depending on project requirements. The conductor size, insulation type, and enclosure dimensions are engineered for each specific rating.
Can POLARIS LT Bus Ducts accommodate tap-off points for intermediate loads?
Yes. POLARIS Bus Duct systems can be designed with tap-off boxes at defined intervals, allowing power to be drawn to sub-panels, MCCs, or individual equipment without interrupting the main bus duct run.
What testing is done on POLARIS LT Bus Ducts before delivery?
POLARIS performs routine factory tests including insulation resistance testing, dielectric withstand testing, conductor continuity, and temperature rise verification per IS 8084 and IEC 61439 standards before dispatching any bus duct system.