Copper Braid Jumpers, Lugs, Links & Bonding Straps
Carsai manufactures custom copper braid jumper products for grounding, bonding and high-current electrical connections. Our braided jumpers are used in transformers, switchgear, electrical enclosures, battery systems, generators, industrial machinery and power-distribution equipment.
A copper braid jumper combines a flexible woven copper conductor with finished connection ends. Depending on the application, the ends may be compressed, welded to solid copper plates, fitted with cable lugs or manufactured with customized mounting holes.
We can manufacture:
- Bare and tinned copper braid
- Flat braided jumpers and flexible links
- Grounding and bonding straps
- Copper braid with ring or flat terminals
- Single-hole and multiple-hole connection ends
- Straight, bent and offset terminals
- Custom braid width and cross-section
- Heat-shrink or sleeve protection
- Prototype and volume quantities
Send us your required hole spacing, terminal or lug design, braid cross-section, overall length, surface finish and quantity for a project-specific quotation.
For our complete range of braid rolls and finished assemblies, visit our Copper Braid Manufacturer page.
What Is a Copper Braid Jumper?
A copper braid jumper is a short flexible conductor used to electrically connect two terminals, busbars or metal components.
It normally contains:
- A flat or tubular copper braid
- A flexible central section
- Prepared connection ends
- Mounting holes, terminal plates or lugs
- Optional plating
- Optional insulation or protective covering
The woven conductor can bend and absorb movement more easily than a rigid copper bar. This makes it useful where connected components experience vibration, thermal expansion, repeated movement or minor installation misalignment.
Common applications include:
- Bonding an enclosure door to its frame
- Connecting transformer terminals to rigid busbars
- Bridging two switchgear sections
- Connecting battery modules and contactors
- Grounding generator and machine frames
- Linking moving equipment to a fixed grounding point
- Connecting busducts to electrical equipment
Products supplied for industrial power connections may also be described as a copper braided flexible link or braided copper flexible link.
The correct name is less important than the conductor cross-section, flexible length, terminal construction and required electrical duty.
Copper Braid Jumpers Versus Flexible Links
The terms jumper and link are frequently used for similar products.
A jumper normally bridges two nearby electrical points. A flexible link may connect larger equipment components while accommodating movement or vibration.
For example:
- A short cabinet-door bonding strap may be called a jumper.
- A transformer-to-busbar connection may be called a flexible link.
- A battery-module connection may be called either a jumper or link.
- A grounding conductor between moving machine sections may be called a bonding jumper.
Multiple completed products may be described as copper braided links, flexible copper braid jumpers or copper braided flexible jumpers.
Their construction can be nearly identical. The main differences are often the conductor size, terminal type and current requirement.
Grounding and Bonding Copper Braid
Copper braid is commonly used for grounding and bonding because it maintains electrical continuity while accommodating mechanical movement.
Bonding connects conductive parts so they remain at substantially the same electrical potential. Grounding or earthing provides a controlled electrical path to the grounding system.
Typical bonding applications include:
- Electrical enclosure doors
- Removable access panels
- Switchgear sections
- Machine covers
- Battery racks
- Transformer enclosures
- Generator housings
- Telecom cabinets
- Data-center racks
- Industrial frames
A copper braided bonding jumper can be installed across hinges, mechanical joints or painted surfaces that may not provide dependable electrical continuity.
Buyers sometimes describe the required product as a bonding jumper flexible copper braid, flexible copper braid bond or flexible flat copper braid bond. These phrases generally refer to a finished flat braid with terminal ends for bonding two conductive parts.
For outdoor, battery or humid environments, a buyer may specify grounding and bonding braid tinned copper to indicate that the conductor requires a corrosion-resistant tinned finish.
Copper Earth Braid Bonds
An earth-bonding conductor performs the same general function as a grounding bond, although “earthing” is more common in the UK, Europe, Australia and many other international markets.
A copper flexible earth braid bond may connect:
- An electrical cabinet door to the enclosure
- A removable panel to the main frame
- A transformer cover to its grounded body
- Two sections of industrial equipment
- A moving component to a fixed earth point
A flexible braid bond must be long enough to allow normal movement without being pulled tight. It should also be routed so that it does not become trapped, twisted or repeatedly bent at one sharp point.
The required conductor size should be based on the expected fault current and the applicable equipment design requirements.
Copper Braid with Lug Terminals
A copper braid with lug combines a woven flexible conductor with one or more cable-lug-style terminals.
The lug may be:
- Crimped onto the braid
- Welded or brazed to the conductor
- Attached through a copper sleeve
- Integrated into a custom terminal assembly
A copper braid lug can provide a compact connection to bolts, studs, ground bars or equipment terminals.
Available lug and terminal styles may include:
- Ring terminals
- Two-hole lugs
- Fork-shaped terminals
- Flat copper palms
- Straight terminal plates
- Bent or offset terminals
- Different terminals on each end
One side of the jumper may use a ring lug, while the other side uses a broad flat copper terminal with two mounting holes.
The customer drawing should define:
- Lug or terminal material
- Hole diameter
- Hole spacing
- Terminal width
- Terminal thickness
- Installed orientation
- Required plating
- Pull and mechanical requirements
Copper Braid Terminal Construction
The copper braid terminal transfers current between the flexible woven conductor and the mating electrical surface.
A reliable terminal should provide:
- Sufficient electrical contact area
- Stable mechanical attachment
- Low connection resistance
- Correct mounting-hole position
- Flat and clean mating surfaces
- A smooth transition into the flexible braid
Possible terminal-manufacturing methods include:
- Compressing the braid into a flat end
- Crimping a copper sleeve around the braid
- Welding a solid copper plate to the braid
- Brazing a copper terminal
- Attaching a manufactured lug
- Consolidating the braid end before drilling
The terminal design must match the current carried by the flexible conductor. A large braid with a small or poorly formed terminal can create localized resistance and overheating.
Bare and Tinned Copper Jumpers
Bare copper jumpers
Bare copper provides high conductivity and can be suitable for protected indoor environments.
Typical uses include:
- Indoor switchgear
- Transformers
- Enclosed power equipment
- Control cabinets
- Protected machinery
Tinned copper jumpers
A tinned copper braided jumper offers improved resistance to oxidation and environmental corrosion.
It may be selected for:
- Battery cabinets
- Outdoor enclosures
- Marine equipment
- Solar and energy storage systems
- Humid industrial environments
- Grounding and bonding assemblies
- Connections to tinned copper terminals
A tinned flexible copper braid bond can be manufactured from pre-tinned copper wires and supplied with tinned copper terminals or lugs.
Tin plating mainly protects the conductor surface. The current capacity still depends on the underlying copper cross-section, length, installation conditions and terminal quality.
Flexible Braided Jumper Designs
A copper braided flexible jumper can be produced in many shapes and terminal arrangements.
Common designs include:
- Straight flat jumpers
- U-shaped jumpers
- Offset links
- 90-degree terminal arrangements
- Different terminal widths
- One-hole and two-hole combinations
- Multiple parallel braid sections
- Braid with attached terminal plates
- Braid with lugs
- Partially insulated jumpers
The terms braided flexible jumper, flexible braided jumper, flexible copper braid jumper and braided copper flexible jumper all describe closely related products.
Another common wording is flexible copper braided jumper. In each case, the buyer normally requires a completed flexible electrical connection rather than unfinished braid roll material.
The drawing should show the installed orientation because terminal bends, braid length and movement direction can affect both fit and product life.
Flexible Bonding Jumpers
A flexible copper braided bonding jumper is designed primarily to bond two conductive parts rather than carry the equipment’s normal operating current.
It may need to conduct high fault current for a short time, so the braid and terminals must still have sufficient electrical capacity.
A bonding jumper should be selected according to:
- Maximum fault current
- Fault duration
- Copper cross-section
- Overall length
- Terminal resistance
- Indoor or outdoor use
- Required movement
- Applicable equipment requirements
The strap should not be installed under continuous mechanical tension. A small controlled curve normally allows the braid to move more naturally.
For repeated door or panel movement, the transition between the terminal and braid should not be positioned directly at the primary bending point.
Power and High-Current Jumpers
Copper braid jumpers are not limited to grounding applications. They can also carry operating current between electrical components.
Typical power applications include:
- Transformers
- Circuit breakers
- Rectifiers
- Battery modules
- Contactors
- Fuses
- Generators
- Busducts
- Welding equipment
- Industrial power supplies
For power connections, a flexible copper braided jumper must be sized according to continuous current and allowable temperature rise.
The required copper cross-section depends on:
- Continuous current
- Peak current
- Duty cycle
- Conductor length
- Ambient temperature
- Cooling and ventilation
- Insulation coverage
- Terminal contact resistance
Several jumpers can be installed in parallel for large-current systems, but they should have equal conductor lengths, cross-sections and comparable terminal conditions to encourage balanced current sharing.
Copper Braid Jumper Versus Cable Assembly
Both braided jumpers and cables can provide flexible electrical connections.
Copper braid jumper advantages
- Flat, low-profile construction
- High flexibility
- Broad terminal contact surfaces
- Integrated terminal plates
- Easy connection to rigid busbars
- Suitable for vibration and movement
- Custom hole patterns
Cable assembly advantages
- Insulated round construction
- Flexible routing in multiple directions
- Familiar crimped-lug termination
- Convenient for longer connections
Braid is often preferred for short, flat connections between busbars, doors, panels and equipment terminals. Cable may be more suitable for longer routed connections.
Dimensions and Braid Selection
A jumper should not be selected by braid width alone.
Two products with the same width may have different:
- Copper cross-sections
- Wire diameters
- Braid densities
- Thicknesses
- Current capacities
- Mechanical flexibility
For accurate selection, specify:
- Actual copper cross-section
- Braid width and thickness
- Overall length
- Flexible length
- Bare or tinned finish
- Terminal dimensions
- Hole diameter and spacing
- Electrical current
- Required quantity
Insulation and Protection Options
Braid jumpers can be supplied bare or with additional protection.
Available options may include:
- Heat-shrink tubing
- PVC sleeves
- Flexible protective tubing
- Partial insulation
- Phase or polarity identification
- Part-number labels
The terminal contact surfaces normally remain exposed.
The protective material must remain flexible enough for the intended movement. A thick or rigid sleeve can restrict the braid and move the primary bending stress toward the terminal transition.
Manufacturing and Inspection
A typical production process includes:
- Confirming the copper material and finish
- Manufacturing and flattening the braid
- Cutting it to the required length
- Preparing terminal or lug components
- Compressing, welding, brazing or crimping the ends
- Drilling or punching mounting holes
- Forming terminal bends and offsets
- Applying plating when required
- Adding insulation or protective sleeves
- Inspecting the finished part
- Protecting contact surfaces during packing
Inspection can include:
- Braid width and thickness
- Copper cross-section
- Overall and flexible length
- Terminal dimensions
- Hole diameter and spacing
- Terminal flatness
- Lug orientation
- Plating coverage
- Insulation position
- Loose or damaged wires
- Surface cleanliness
Information Needed for a Quotation
To quote custom copper braid jumpers, please provide:
- Drawing, sketch or sample
- Bare or tinned copper
- Required copper cross-section
- Braid width and thickness
- Overall length
- Flexible length
- Terminal or lug style
- Terminal dimensions
- Hole diameter and spacing
- Straight, bent or offset ends
- Operating or fault current
- Plating requirement
- Insulation requirement
- Prototype quantity
- Production quantity
- Annual demand
Frequently Asked Questions
Can you add different terminals to each end?
Yes. One end can use a ring lug while the other uses a flat terminal plate, two-hole lug or another custom connection.
Can you supply fully tinned jumpers?
Yes. Tinned braid and tinned copper terminals can be manufactured according to the agreed specification.
Are braid jumpers used only for grounding?
No. They can be designed for grounding, bonding or continuous high-current power connections.
Can you manufacture several braid sections in parallel?
Yes. Multiple braids can be combined into one jumper or installed as separate parallel links for higher-current applications.
Can the jumper be insulated?
Yes. Heat-shrink tubing, PVC sleeves and other flexible protective coverings can be evaluated.
Can you reproduce an existing jumper from a sample?
Yes. A sample can help identify the construction, but a dimensioned drawing is recommended for repeat production and inspection.
Request a Copper Braid Jumper Quotation
Carsai manufactures copper braid jumpers, flexible links, lugs and bonding straps for grounding systems, transformers, batteries, switchgear and industrial power equipment.
Send your required hole spacing, terminal or lug design, braid cross-section, length, surface finish, insulation and quantity.
