There are differences between THWN and PV wire in multiple aspects, including usage, rated voltage, temperature requirements, insulation and sheath materials, and applicable environment. The following is a detailed explanation of these differences:
Purpose:
THWN wire are mainly used for electrical wiring inside buildings, suitable for humid or dry environments, and have the characteristics of oil and gasoline resistance.
PV wire are specifically designed for photovoltaic systems, especially for connecting solar modules. It can be used not only for solar panels, but also for underground service entrances, public facilities, direct burial, and general wiring applications.
Rated voltage:
The rated voltage of THWN wire is usually 600V.
The cable ratings of PV wire include 600V, 1000V, and 2000V, which can be used in conjunction with solar modules designed for use in solar systems above 600V.
Temperature requirements:
The rated temperature of THWN wire is 90 ° C in dry or humid environments, and 75 ° C in humid environments.
The rated temperature of PV wire under humid conditions is 90 ° C, while under dry conditions, the rated temperature can reach 150 ° C.
Insulation and sheath materials:
THWN wire use polyvinyl chloride (PVC) insulation and nylon sheath, which have good heat resistance, corrosion resistance, and self-lubricating properties.
PV wire typically use XLPE (cross-linked polyethylene) insulation material, which is a thermosetting, zero halogen insulation material with flame retardancy. Some PV wires may also have additional protective layers, such as thicker insulation or sheaths.
Applicable environment:
THWN wires are suitable for damp or dry environments, as well as situations that require oil and gasoline resistance.
PV wires are designed specifically for solar energy systems, requiring long-term exposure to sunlight and excellent resistance to environmental conditions such as ultraviolet radiation, wind, weather, high temperature fluctuations, and humidity.
Other features:
PV wire typically have better flame retardancy and are suitable for ungrounded solar arrays.
THWN wire may have better compression resistance, but specific characteristics may vary depending on the product.
In summary, there are significant differences between THWN and PV wire in multiple aspects, and the choice of wire depends on the specific application scenario and requirements. When deciding which type of wire to use, careful consideration should be given to the system's voltage requirements, temperature requirements, environmental conditions, as well as the characteristics and purpose of the wire.
