In modern electrical systems, busbars serve as the backbone for efficient power distribution. Whether in medium- and high-voltage switchgear or new energy electric vehicles (EVs), copper or aluminum busbars are widely used due to their superior conductivity and compact structure.

However, exposed busbars—especially at junctions, overlaps, and connection points—are vulnerable to environmental and electrical risks. To address these challenges, busbar heat shrink tubing and busbar joint protection covers (joint boxes) are essential components for ensuring system safety, insulation integrity, and long-term reliability.

Typical challenges:

• Risk of short circuits due to reduced phase clearance
• Exposure to dust, humidity, and contaminants
• Potential flashover or tracking under high voltage stress

Solution:

• Busbar heat shrink tubing provides: Reliable insulation enhancement Reduced phase-to-phase clearance requirements Protection against environmental contamination
• Busbar joint covers (joint boxes) are used at: Main busbar connections Sub-busbar branching points Overlapping joints (lap joints)

Busbar Joint Protection: Why It Matters

The connection points between main busbars and sub-busbars are the most vulnerable parts of the system.

Common Joint Types

• Lap joints (overlapping copper bars)
• Bolted connections
• Transition joints (T type, I type, L type or customized sizes and type)

Risks Without Proper Protection

• Localized electric field concentration
• Increased risk of partial discharge
• Oxidation and corrosion at contact surfaces
• Mechanical damage or accidental contact

Joint Box (Insulation Cover) Functions

• Provides full insulation enclosure
• Enhances dielectric performance
• Protects against small animals, dust, moisture, and foreign objects
• Improves installation safety and aesthetics

New Energy Vehicles (EV High-Voltage Busbars)

In electric vehicles, high-voltage busbars are used in:

• Battery pack connections
• Inverter and motor control systems
• Power distribution units (PDU)

Challenges in EV applications:

• High operating voltages (typically 300V–1000V+)
• Limited installation space
• Exposure to vibration and thermal cycling
• Requirement for flame retardancy and safety compliance

Solution:

• Heat shrink busbar tubing offers: Compact insulation, UL approved E341796

Visit our website www.upmheatshrink.com to know more information about cooper or aluminum bus bar protection solutions. Thanks.