Recent PV fire incidents are a reminder that system safety is built long before a fire ever starts.

As solar expands across warehouses, factories, commercial rooftops and utility-scale sites, fire safety deserves greater attention.

In June 2026, a major fire destroyed a nearly 500,000-square-foot cold-storage warehouse in Boyle Heights, Los Angeles. Lineage later filed a lawsuit seeking more than $1 billion in damages from companies involved with the rooftop PV system.

The complaint alleges that the system was energized before critical safety checks were completed, despite concerns involving wiring, connections and other equipment. These allegations are disputed, and the official cause remains under investigation.

Still, the incident raises an important question:

As PV systems grow larger and operate for decades, are we paying enough attention to the components and connections that carry DC power every day?

A PV fire often begins long before flames appear

Fire is usually the final visible event.

The underlying problem may begin with something much smaller:

• Poorly assembled connectors

• Incompatible connections

• Loose or stressed contact points

• Damaged insulation

• Improper installation

On the DC side, these risks are especially important because PV circuits can remain energized whenever sufficient light is available, while electrical faults may create sustained arcs.

A 2026 investigation into a rooftop PV fire in South China, for example, identified a DC arc caused by stress-induced poor contact in a junction box as the root cause.

A small connection problem can therefore develop into localized heating, insulation damage and eventually arcing.

Cable quality is part of system safety

PV cables may operate outdoors for decades under:

UV · heat · moisture · temperature cycling · bending · abrasion · mechanical stress

Their reliability depends on more than conductor size.

It depends on the entire chain:

Conductor → Insulation → Sheath → Connection → Installation

A high-quality cable cannot compensate for a poorly assembled connector.

A certified connector cannot compensate for damaged insulation.

And good system design cannot compensate for poor installation.

PV fire safety is a system issue.

From compliance to long-term reliability

Certification is essential, but compliance alone does not answer how a PV system will perform after 20 or 30 years.

Long-term safety also depends on whether:

the cable suits the environment, connectors are correctly assembled, mechanical stress is controlled, cable routes are protected, and deterioration is identified during operation.

This is especially important for rooftop PV systems installed above warehouses and factories, where the consequences of failure can extend far beyond the solar installation itself.

Reliability starts before installation

At KUKA CABLE, we believe reliability must be designed into the cable from the beginning.

That means paying attention to material selection, conductor quality, insulation integrity, sheath performance, dimensional control and testing — not only when the cable leaves the factory, but throughout its expected service life.

A cable alone cannot guarantee PV system safety.

But every reliable solar system depends on every component continuing to perform its role.

The fire is the last event. Reliability begins much earlier.

For solar projects designed to operate for decades, the question should not only be:

“How much does this component cost today?”

It should also be:

“What happens if it fails years from now?”

Because long-term solar performance is not only about generating energy.

It is about generating energy safely and reliably for decades.