USE-2 and PV cables are both types of electrical cables used in photovoltaic (PV) systems. However, there are some key differences between the two types of cables in terms of their intended use, construction, and testing requirements.

Intended Use

USE-2 cables were originally designed for use as underground service entrance cables. They were later also used to connect PV modules. USE-2 cables have a voltage rating of 600V and a temperature rating of 90℃. According to the National Electrical Code (NEC) in the United States, USE-2 cables can only be used in grounded PV arrays.

PV cables are specifically designed for PV systems. They can have voltage ratings of 600V, 1000V, or 2000V, and temperature ratings of 90℃ or 150℃. PV cables can be used in both grounded and ungrounded PV arrays.

Construction

USE-2 cables can have solid or stranded conductors made of copper, copper-clad aluminum, or aluminum. Their insulation and jacket are typically made of XLPE or EPR/CPE materials.

PV cables must have stranded copper conductors. Their insulation and jacket are typically made of XLPE or PVC materials and are thicker than those of USE-2 cables.

Testing Requirements

USE-2 cables are required to undergo overload, short circuit, ground fault, and fire resistance testing.

PV cables must undergo all of the same testing as USE-2 cables, as well as additional testing for sunlight resistance, low-temperature flexibility, and abrasion resistance.

Conclusion

PV cables offer better performance than USE-2 cables but are also more expensive. When choosing cables, it is important to consider the specific requirements of the PV system.

The following table summarizes the key differences between USE-2 and PV cables: