Modern automotive manufacturing is an electricity-hungry operation. Robotic welding arms, precision assembly lines, paint booths, conveyor systems, EV battery testing rigs — all of it depends on reliable, high-capacity power delivery running without interruption, shift after shift.

Yet power cabling tends to get upgraded reactively rather than proactively. Facilities invest in the latest machinery and automation systems but continue running them on electrical infrastructure that was specified for a different era of production. The mismatch doesn’t always announce itself loudly. More often, it accumulates quietly — until it doesn’t.

Here are seven signs that an automotive plant’s power cabling has reached its upgrade threshold.

1. Frequent Unexplained Tripping

Circuit breakers and protective devices exist to trip when something is wrong. The occasional trip is normal. But when tripping happens regularly without a clear, identified cause — and especially when it recurs in the same circuits — the cable infrastructure itself is worth examining.

Older or undersized cabling running near its thermal limit will trigger protective devices even under loads it was originally specified to handle, because insulation degradation raises resistance and heat generation over time. If your maintenance team is resetting breakers rather than finding root causes, that pattern deserves a systematic look.

2. Unexplained Energy Cost Increases

Rising energy bills that don’t track with increased production volumes are a reliable signal that something is absorbing power inefficiently. Degraded cables are a common culprit that rarely makes it onto the initial diagnostic list.

As cable insulation ages and conductors oxidise at connection points, resistive losses increase. The electricity is still being consumed — it’s just being lost as heat rather than doing productive work. Facilities that have benchmarked energy consumption per unit of output and see that ratio drifting upward without a clear operational explanation should include cabling condition in their efficiency audit.

3. Cables Running Noticeably Hot

Cables that are warm to the touch during normal operation, or that show visible heat signatures on thermal imaging surveys, are operating at or beyond their design limits. Heat is the primary enemy of cable insulation life — every sustained temperature increase above rated limits meaningfully shortens the service life of the cable.

In automotive plants where cabling runs through conduit, cable trays, and tightly bundled runs, heat buildup is especially problematic because dissipation is restricted. Thermal surveys — which are standard practice in well-maintained industrial facilities — should flag these conditions well before failure occurs.

4. EV and Advanced Drivetrain Production Has Been Added

The shift toward electric vehicle manufacturing has fundamentally changed the electrical load profile of automotive plants. EV battery assembly, high-voltage testing stations, and charging validation equipment draw significantly more power than the conventional drivetrain processes they often replace or supplement.

Facilities that have added EV production lines to existing infrastructure — without a corresponding review of cabling capacity — are running a risk that grows with every additional high-draw system commissioned. Procurement teams increasingly factor in purpose-built industrial power cables rated for high-amperage continuous operation when specifying new lines or retrofitting existing ones.

Companies like Duraline come from the industrial side of electrical infrastructure, where engineered power distribution systems have long been developed around the realities of high-load environments, evolving facility demands, and long-term operational reliability.

5. Visible Physical Deterioration

A visual inspection of cable runs is one of the simplest diagnostic tools available — and one that often goes months or years without being done systematically. Signs to look for include:

• Cracked or brittle insulation — a sign of age-related polymer degradation

• Discolouration or scorch marks near connectors or junction points

• Swelling or deformation of the cable jacket, indicating internal heat damage

• Abrasion damage where cables pass through metal conduit or contact machinery

• Corrosion at termination points, particularly in areas with humidity or chemical exposure

Any of these conditions indicate that the cable is no longer performing as designed. In a high-demand automotive production environment, physical deterioration is not a cosmetic concern — it is a fault in progress.

6. Increased Downtime After Equipment Upgrades

When new automation equipment, upgraded robotics, or higher-capacity machinery is installed on existing circuits, the cabling that served the previous equipment is now doing a different job. If unexplained downtime increases after a capital equipment upgrade, the cable infrastructure servicing those new systems is worth investigating before assuming the equipment itself is at fault.

According to the U.S. Energy Information Administration, the manufacturing sector accounts for roughly one-third of total U.S. electricity consumption — and in automotive specifically, production disruptions from electrical failures are among the most costly per-hour events a plant can experience. Tracing downtime to its root cause, including cabling, pays back quickly.

7. The Plant Is Running 24/7 on Infrastructure Designed for Single Shifts

Many automotive facilities that have moved to extended production schedules — continuous operation, double shifts, or 24/7 runs — are doing so on cabling that was designed and specified for single-shift loading. This matters because cable thermal rating calculations assume a duty cycle with recovery periods built in.

A cable that handles a 10-hour shift with adequate thermal margin may run significantly hotter across a continuous 24-hour cycle, because it never gets the recovery time its ratings assumed. Over months and years, that sustained thermal stress translates directly to insulation degradation, increased fault risk, and shortened service life across the entire distribution system.

Conclusion

The challenging thing about power cable degradation in automotive plants is that it’s cumulative and mostly invisible right up until it isn’t. Most of the signs listed here are detectable well in advance of failure — if someone is actually looking for them.

A structured cable audit, combined with thermal imaging and consumption benchmarking, gives facilities the information they need to plan upgrades proactively rather than manage emergencies reactively. In automotive manufacturing, where unplanned downtime costs can run into tens of thousands of dollars per hour, that forward-looking approach is one of the more straightforward investments a plant can make.