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Installation Procedure and Common Issues of Enclosed Busbars in a Common Enclosure
Installation Procedure and Common Issues of Enclosed Busbars in a Common Enclosure
It includes phase-separated enclosed busbars, common‑box enclosed busbars (including those with shared phase compartments), and cable‑type busbars, which are widely used as conductors in power plants, substations, industrial facilities, and residential switchgear systems. Today, we’ll discuss the installation procedures and common issues associated with common‑box enclosed busbars.
1. Prior to the installation of the enclosed busbar, the following specialized tools must be prepared in advance:
Crane, hoist, flexible plastic rope or galvanized steel wire rope encased in rubber tubing, torque wrench, screwdriver, wooden mallet, hammer, impact drill, tape measure, spirit level, plumb bob, sandpaper, vacuum cleaner, organic cleaning solvent, clean white soft cloth, waterproof canvas, file, safety harness, safety helmet, steel pipe scaffolding, string line, power switch, and so on.
II. Unboxing and Inspection of Enclosed Busbars Upon Arrival:
Verify, in accordance with the manufacturer’s detailed packing list, whether the total quantity of enclosed busbars and spare parts matches the shipment list.
Since busbar trunking systems fall under a broad category of large and medium-sized products, their components are relatively expensive. Therefore, upon arrival at the construction site, each box of spare parts must be carefully inspected and verified. The delivery list must be jointly signed and approved by all parties involved, including the property owner, the project supervisor, the manufacturer, and the installation contractor.
Busbar inspection can determine whether composite insulators are damaged or cracked, whether the busbar housing is deformed or scratched, and whether the busbar conductors have shifted. If any of these issues are detected, they must be properly addressed to prevent unnecessary rework after busbar installation is completed.
Installation Standards and Process Flow for Three-Section Enclosed Busbars:
The standard is to install the indoor components first, followed by the outdoor ones; within the indoor section, installation proceeds from the inside out. Specifically, the busbar assembly is installed according to the master CAD part drawings, with adjustments made to size and alignment, culminating in the connection at the fracture surface.
(1) Construction Procedures
Busbar trunking inspection → Precise measurement and positioning → Fabrication and installation of seismic supports → Insulation resistance testing → Busbar trunking assembly → Phase sequence verification
(2) Construction Methods and Technical Measures for Key Works
1) Inspection of busbar trunking systems
The quality of busbar trunking systems should be rigorously inspected, with particular attention paid to the following aspects:
a. The busbar trunking enclosure shall be intact and free from damage. The model and specifications of the busbar trunking and distribution cabinets shall comply with the design requirements. Accessories and ancillary components shall be appropriate and provided in sufficient quantities.
b. The mating surfaces of busbar connectors shall be planarized, with symmetrically aligned connection holes and uniform spacing from the edges.
c. The antistatic rubber strip in the middle of the busbar must not be damaged or cracked.
d. Use a 500 V megohmmeter to accurately measure the insulation resistance between the phase conductors and the neutral busbar, the PE busbar, and the enclosures of each phase; the measured value shall be no less than 20 MΩ. The construction site shall be kept clean, and on-site idle time should be minimized. Proper measures must be taken to prevent moisture and water ingress.
(2) Precise measurement and accurate positioning of busbar trunking systems
a. The installation height and routing of busbar trunking shall be determined comprehensively in accordance with the construction drawings and the specific conditions of the project. Unless there is a conflict with large-diameter pipelines or cable tray installations, it should be laid along the shortest possible parallel route. The clearance between the bottom of the busbar trunking and the floor surface shall not be less than 2.5 m. Minimum clearances from building surfaces, other electrical conduit routes, and various types of pipelines shall comply with applicable national standards.
b. For horizontally installed busway, seismic supports are typically spaced 2 to 3 meters apart, with the spacing determined based on the busway’s net weight per meter. Additional support brackets shall be provided at busway bends and at connections to distribution cabinets.
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