Why Cable Assemblies Fail In The Field

A cable assembly is only as reliable as its weakest component. Poor manufacturing practices, incorrect material selection or environmental conditions can all shorten the lifespan of a cable assembly and lead to expensive downtime. For OEMs and industrial equipment manufacturers, understanding the most common causes of cable assembly failure can help improve product reliability, reduce warranty claims and lower long-term operating costs.

Incorrect strain relief.

Every cable experiences some degree of pulling, bending or twisting during normal use. Without proper strain relief, those forces are transferred directly to the electrical conductors or connector terminations. Over time, repeated movement can cause wires to break internally, resulting in intermittent or complete electrical failure.

Proper strain relief protects the connection by distributing mechanical stress away from the termination point. This is especially important in industrial automation, mining equipment, medical devices and transportation applications where cables are subjected to frequent movement.

Choosing the wrong jacket material.

Not every cable jacket is designed for every environment. A cable that performs well inside a climate-controlled facility may fail quickly when exposed to chemicals, oils, abrasion or extreme temperatures. Likewise, outdoor applications require materials that can withstand sunlight and changing weather conditions.

Selecting the correct jacket material helps ensure the cable performs reliably throughout its expected service life. Such material includes PVC, polyurethane (PUR), thermoplastic elastomer (TPE) or cross-linked polyethylene (XLPE).

Connector pullout.

Connectors are one of the most vulnerable points in any cable assembly. Improper assembly, weak retention mechanisms or excessive pulling forces can cause connectors to loosen or pull away from the cable entirely. Even slight movement can create intermittent electrical connections that are difficult to diagnose. High-quality cable assemblies use properly matched connectors, secure locking mechanisms and validated assembly processes to ensure reliable performance in demanding environments.

UV damage.

Extended exposure to sunlight can cause certain jacket materials to become brittle, crack or lose flexibility. Once the protective jacket deteriorates, moisture and contaminants can reach the conductors, accelerating failure. UV-resistant materials are essential for solar installations, telecommunications equipment, marine applications and any cable assemblies installed outdoors.

Moisture ingress.

Moisture entering connectors or cable terminations can lead to corrosion, increased electrical resistance, short circuits and complete system failure. In harsh environments, repeated freeze-thaw cycles can make the problem even worse by expanding small openings that allow additional water intrusion. Proper sealing methods, overmoulding, gaskets and connectors with appropriate ingress protection (IP) ratings help prevent moisture from reaching sensitive electrical contacts.

Constant vibration.

Many industries, including oil and gas, mining, transportation, HVAC and heavy equipment, operate in environments with continuous vibration. Over time, vibration can loosen connectors, fatigue conductors and damage crimps or solder joints. Even well-designed equipment can experience premature cable failures if vibration isn't considered during the design and manufacturing process.

Improper crimping.

A poor crimp can compromise an otherwise well-designed cable assembly. If too much or too little force is applied during crimping, the electrical connection may have higher resistance or insufficient mechanical strength. These defects often remain hidden until the product has been operating in the field for months or even years.

Many cable assembly failures are preventable.

Careful engineering, proper material selection, controlled manufacturing processes and thorough testing all contribute to assemblies that perform reliably in real-world conditions. Partnering with an experienced cable assembly manufacturer means gaining a manufacturing partner committed to quality, consistency and long-term reliability.

To learn all about Flux Connectivity’s high-quality overmolded cable assemblies, call 1-800-557-FLUX or email us at connect@fluxconnectivity.com. You may also fill out the form on our Contact Us page!