1. Basic Definitions of RW90 Cable and RWU90 Cable
1.1 What is RW90 Cable?
RW90 cable is an insulated wire designed for dry environments. It is typically made of copper or aluminum conductors with cross-linked polyethylene (XLPE) insulation. The "90" in its name refers to its maximum operating temperature of 90°C in dry conditions. RW90 cable is commonly used in indoor wiring systems, such as in conduits, panel boards, or cable trays.
1.2 What is RWU90 Cable?
RWU90 cable is an enhanced version of RW90, designed for use in wet, outdoor, and underground environments. It also uses XLPE insulation but is engineered to resist moisture, UV radiation, and physical damage. RWU90 cable is a preferred choice for underground distribution and outdoor service entrances.
2. Key Technical Differences Between RW90 and RWU90
The following table summarizes the technical differences between RW90 and RWU90 cables:
| Feature | RW90 Cable (rw90 cable) | RWU90 Cable (rwu90 cable) |
|---|---|---|
| Insulation Material | XLPE | XLPE |
| Temperature Rating | 90°C (dry locations only) | 90°C (wet and dry locations) |
| Voltage Rating | Typically rw90 600v to 1kV | 600V to 2kV |
| Environmental Use | Dry indoor areas only | Wet, underground, and outdoor use |
| Direct Burial | Not allowed | Allowed |
| UV Resistance | Usually not UV-resistant | UV-resistant |
| Application Areas | Indoor wiring, conduit systems | Underground feeders, service entry |
3. Common Applications of RW90 Cable
RW90 cable is widely used in residential and commercial buildings, especially in dry and protected environments.
Example 1: Residential Distribution System
In a residential apartment, an electrician uses rw90 6awg copper wire to connect a distribution panel to a water heater. Since the cable runs through dry wall cavities and attic spaces, RW90 cable meets the insulation and thermal requirements.
Example 2: Commercial Lighting
In an office building, rw90 600v cables are installed above the ceiling to power lighting systems. Enclosed in metal conduits, RW90 offers reliable performance and heat resistance at a competitive price.
4. Advantages and Use Cases for RWU90 Cable
Example 3: Underground Power Feeder
For a garage expansion project, power needs to be fed from the main building to a detached structure through underground conduits. RWU90 cable is recommended due to its waterproof properties and direct burial capability, providing a safer and longer-lasting solution than RW90.
Example 4: Outdoor Agricultural Lighting
A farm requires lighting poles for nighttime operations. Since the cables will be exposed to sunlight and rain, rwu90 cable is ideal due to its UV and moisture resistance, outperforming standard rw90 cable in outdoor applications.
5. Standards and Certifications
CSA Certification: Both RW90 and RWU90 cables must comply with CSA C22.2 standards.
Voltage Ratings: Most RW90 cables are rated at rw90 600v, while RWU90 options may be rated from 600V up to 2kV.
Flame Resistance: Both types must meet CSA FT1 or FT4 flame-test requirements depending on the installation environment.
6. Cost Considerations and Installation Guidance
RW90 cable is generally more affordable, especially when using aluminum conductors, making it suitable for cost-sensitive indoor wiring.
RWU90 cable is more expensive per foot, but its ability to be directly buried without conduit can reduce total project costs.
The price difference between rw90 6awg and RWU90 6AWG (both copper) is around 10%–20%, but RWU90's installation flexibility often offsets this difference.
7. Quick Comparison Table
| Comparison Factor | RW90 (rw90 cable) | RWU90 (rwu90 cable) |
|---|---|---|
| Application | Indoor dry locations only | Outdoor, underground, and wet areas |
| Direct Burial | No | Yes |
| UV Resistance | No | Yes |
| Voltage Rating | rw90 600v to 1kV | 600V to 2kV |
| Cost Effectiveness | Lower material cost, complex install | Higher material cost, easier install |
| CSA Approved | Yes | Yes |
8. Frequently Asked Questions
1. Can RWU90 be used indoors?
Yes. While RWU90 cable is designed for wet and outdoor environments, it can also be used indoors, especially where additional protection is required.
2. Is RW90 cable sunlight resistant?
No. Most RW90 cables, especially non-jacketed ones, are not UV resistant and should not be installed in direct sunlight.
3. Which cable is better for underground wiring?
RWU90 cable is better for underground installations because it is rated for direct burial and moisture resistance, unlike RW90.
4. Do both RW90 and RWU90 support aluminum conductors?
Yes. Both types come in copper and aluminum variants. However, compatibility with connected equipment and conductivity should be considered.
Dongguan Greater Wire & Cable Co., Ltd. With more than 30 years of industry experience, our technical team will provide you with practical optimization suggestions for your project to ensure wiring safety. Welcome to send us your project requirements and we will contact you as soon as possible!