1. Introduction to RW90 Aluminum Wire
RW90 is a cable model designated according to Canadian Electrical Code (CEC) and National Electrical Code (NEC) standards. It is commonly used for low-voltage power transmission in distribution panels, lighting circuits, and industrial control systems.
Meaning of RW90:
R: Rubber-like heat-resistant insulation
W: Wet – suitable for damp locations
90: Rated for continuous operation at 90°C
Conductor Types: RW90 cables are available in copper or aluminum. RW90 aluminum wire is especially popular for large-scale projects due to its lower cost and lighter weight.
Insulation: Typically made of cross-linked polyethylene (XLPE), offering excellent resistance to heat, moisture, and chemicals.
2. RW90 Cable Specifications
The performance of RW90 cable is governed by strict technical parameters.
Voltage Rating: Typically rated for 600V
Temperature Range: Rated for up to 90°C in both dry and wet environments
Conductor Types:
Single-core RW90 conductor
Multi-core RW90 aluminum wire
Insulation Thickness: Depends on cable size and specification
Installation Method: Suitable for conduit installation; conditional underground use
RW90 cable specifications ensure reliability under high temperatures, moisture, mechanical stress, and chemical exposure.
3. Can RW90 Be Used Underground?
1. Electrical Code Guidelines
According to CEC and NEC, RW90 cable is not designed for direct burial. However, it can be used underground if installed in appropriate conduit systems, such as:
PVC conduit
Rigid Metal Conduit (RMC)
Electrical Metallic Tubing (EMT)
2. Feasibility of Underground Use
Although RW90 aluminum wire offers moisture resistance, its insulation does not protect against direct contact with soil, rocks, or corrosive substances. Therefore, underground use requires conduit protection.
3. Installation Conditions
Use UL or CSA-certified conduit
Minimum burial depth is generally 18 inches (approx. 45 cm), depending on soil type
Deeper burial (24 inches or more) required under driveways or roadways
4. Real-World Applications of RW90 Underground
1. Residential Projects
RW90 aluminum wire is often used from distribution panels to garages or outdoor power sources, typically routed through PVC conduit underground.
2. Commercial Installations
In commercial settings, RW90 conductors are installed underground via EMT or RMC conduits to ensure both power reliability and personnel safety.
3. Industrial Facilities
In high-current applications, RW90 cable specifications ensure efficient transmission and long-term stability, making it suitable for installation in duct banks or underground cable trays.
5. Key Precautions for Underground Installation
Conduit Type: PVC Schedule 40 or higher is recommended
Moisture Protection: Install drain holes at conduit low points to prevent water accumulation
Backfill Material: Use sand or soil without sharp objects to avoid cable damage
Burying Depth:
Grass or soil: minimum 18 inches
Driveways or roads: at least 24 inches
Bend Radius: Avoid excessive bending to prevent insulation or conductor damage
Cable Labeling: Clearly mark conduit endpoints for future maintenance
6. Advantages and Disadvantages of RW90 Cable
Pros:
RW90 conductor has high heat resistance, ideal for 90°C environments
RW90 aluminum wire is lighter and more economical for large-scale projects
Cost-effective compared to copper cables
Flexible installation options (indoor, wet, or conduit systems)
Cons:
Not suitable for direct burial without conduit
Requires additional mechanical protection
Aluminum has lower conductivity than copper; may require larger wire gauge
Dongguan Greater Wire & Cable Co., Ltd. is the first in the industry to pass authoritative certifications such as UL, VDE, CE, TÜV, SAA, ISO, etc., and the cable products it provides are widely applicable to multiple markets around the world. In addition to the certification itself, we can also provide you with complete compliance documentation support and technical consulting. If you want to reduce risks and improve efficiency during overseas expansion, please feel free to contact us.