When it comes to electrical installation, safety and compliance are not optional-they're essential. One of the most common questions among contractors and builders is: Can you bury AC90 cable?
This question matters because using the wrong cable type underground can lead to corrosion, short circuits, or even system failure. In this article, we will clarify everything you need to know about AC90 cables, whether they can be buried, what alternatives exist, and how to ensure a safe, code-compliant underground installation.
What Is AC90 Cable?
AC90 cable (Armored Cable 90°C) is a type of armored electrical cable designed for dry locations.
It consists of:
- Copper or aluminum conductors
- Cross-linked polyethylene (XLPE) insulation
- Interlocked aluminum armor for mechanical protection
AC90 is widely used in commercial, residential, and light industrial applications. Its aluminum armor provides excellent protection against physical damage, making it ideal for exposed indoor wiring and environments where conduit use is limited.
However, its design does not include a waterproof outer jacket, which directly impacts its suitability for underground use.
Can You Bury AC90 Cable Directly?
The short and precise answer is: No, you cannot directly bury AC90 cable.
According to CSA C22.1 (Canadian Electrical Code) and NEC Article 320 (National Electrical Code, U.S.), AC90 cable is rated for dry locations only. It lacks the moisture-resistant and corrosion-proof jacket required for direct burial or wet locations.
If AC90 is buried without proper protection, water infiltration can cause:
- Insulation degradation
- Corrosion of aluminum armor
- Electrical failure or short circuit risks
To comply with electrical standards, AC90 should never be installed directly in soil or any wet environment.
If You Must Bury AC90, What Are the Alternatives?
If your project requires underground wiring but you already have AC90 on hand, there are two compliant installation methods:
- Install AC90 inside a watertight conduit system
Use PVC or HDPE conduit rated for underground use.
Ensure all joints are sealed against moisture ingress.
- Switch to a direct-burial-rated cable, such as ACWU90 or TECK90.
Both are designed for wet, outdoor, and underground applications.
Their outer jackets are moisture- and UV-resistant, ensuring long-term durability.
This approach ensures safety, compliance, and long-term performance while minimizing maintenance risks.
AC90 vs. ACWU90: Key Differences
| Feature | AC90 Cable | ACWU90 Cable |
|---|---|---|
| Direct Burial | ❌ Not allowed | ✅ Approved |
| Application | Dry indoor locations | Wet/outdoor/underground |
| Outer Jacket | None (bare aluminum armor) | PVC waterproof jacket |
| Standard | CSA C22.2 No. 51 | CSA C22.2 No. 174 |
| Typical Use | Commercial buildings, interior wiring | Outdoor lighting, buried circuits, industrial plants |
If your project involves outdoor or underground wiring, always choose ACWU90 cable over AC90 to ensure compliance and long-term reliability.
Proper Installation and Safety Tips for Underground Cables
Even when using cables rated for direct burial, following best practices is crucial:
- Maintain the correct burial depth as per local codes (typically 18–24 inches).
- Avoid sharp bends or excessive tension during installation.
- Perform insulation resistance tests before backfilling.
- Mark the trench with warning tape to indicate buried electrical lines.
- Keep separation distance from communication or gas lines for safety.
A compliant installation not only protects your equipment but also ensures personnel safety and prevents costly rework.
Choose the Right Cable
In summary, AC90 cable cannot be directly buried. It is designed for dry, indoor applications and must not be used underground without protection. For wet or buried environments, ACWU90 or TECK90 cables are the right solutions, offering waterproof protection and compliance with international standards.
At Dongguan Greater Wire & Cable Co., Ltd., we specialize in manufacturing and supplying high-quality AC90, ACWU90, and TECK90 cables that meet CSA and IEC certifications.
Whether your project is residential, commercial, or industrial, we provide:
- Comprehensive technical support
- Flexible customization options
- Reliable after-sales service
👉 No matter the size of your project, our expert team will help you choose the right cable and ensure full compliance with safety codes.
Contact Us Today:
📞 Tel/WhatsApp/Wechat: +86 135 1078 4550 / +86 136 6257 9592
📧 Email: manager01@greaterwire.com
🌐 Dongguan Greater Wire & Cable Co., Ltd. - Your trusted partner for safe and certified electrical cable solutions.