In modern industrial and building electrical systems, cables are the "lifeline" of power transmission. However, moisture, rain, and dust can silently threaten the safety and reliability of these systems.
For cables installed outdoors, underground, or in humid environments, water resistance is not just a feature-it's a necessity.
That's why many engineers and procurement professionals often ask:
👉 "Is AC90 cable waterproof?"
This is more than a technical question-it's a key consideration that affects project safety, cost, and long-term reliability.
In this article, we'll take a closer look at the structure, waterproof capability, suitable environments, and installation guidelines of AC90 cable, and share professional insights to help you make the right choice.
What Is AC90 Cable?
AC90, short for Armored Cable 90, is a widely used armored electrical cable across North America and global markets. Known for its mechanical protection, installation convenience, and reliability, AC90 is commonly applied in commercial buildings, industrial facilities, and protected outdoor environments.
Main Structure
- Conductor (Copper / Aluminum): High conductivity ensures efficient power transmission.
- Insulation (XLPE – Cross-Linked Polyethylene): Excellent heat and moisture resistance for dry or damp locations.
- Armour (Interlocked Aluminum Armour): Provides strong mechanical protection against impact and compression.
- Outer Jacket (Protective Layer): Some variants include an additional jacket for improved corrosion and moisture resistance.
Key Advantages
- Can be installed without additional conduit
- Strong mechanical protection and easy handling
- CSA and UL certified, compliant with North American standards
- Low maintenance cost and long service life
Because of these benefits, AC90 cable is a popular choice for power distribution systems in both industrial and commercial applications.
Is AC90 Cable Waterproof?
Let's get to the main question: Is AC90 cable waterproof?
The short answer is: AC90 cable is moisture-resistant, but not fully waterproof.
Moisture Resistance
AC90's XLPE insulation offers strong resistance to humidity and condensation. It effectively protects conductors from corrosion in mildly damp environments.
Waterproof Limitation
However, the interlocked aluminum armor is not a sealed barrier.
This means that in constantly wet, submerged, or underground conditions, water vapor may still enter through small gaps in the armor, potentially reducing the cable's lifespan or causing safety risks.
AC90 is best described as a moisture-resistant cable-not a waterproof one.
For environments exposed to continuous moisture, rain, or underground installation, we recommend choosing TECK90 cable, which provides full waterproof protection with a PVC outer jacket.
Can AC90 Cable Be Used in Damp or Underground Environments?
Suitable Applications
AC90 cable is ideal for:
- Dry or lightly damp indoor areas
- Manufacturing plants, machinery rooms, and power distribution panels
- Covered outdoor areas protected from direct rain
Unsuitable Applications
AC90 is not recommended for:
- Direct burial underground installations (without conduit)
- Areas with constant exposure to rainwater or condensation
- Chemical or high-humidity environments
In such cases, TECK90 cable-with its waterproof PVC outer sheath-is a safer and longer-lasting option.
Certification Reference
According to CSA C22.2 No. 51 Standard:
- AC90 is approved for dry or damp locations
- TECK90 is approved for wet, hazardous, or direct burial locations
Correct Installation and Protection Tips for AC90 Cable
Even though AC90 is not a waterproof cable, proper installation and protection can significantly enhance its performance and longevity.
Use Waterproof Fittings and Seals
- Apply waterproof connectors or sealing glands at cable ends.
- Use insulating tape and heat-shrink sleeves for extra protection.
Plan the Cable Route Properly
- Avoid direct exposure to rain or standing water.
- Use waterproof conduits when necessary.
- Ensure cable bends stay above possible water accumulation areas.
Regular Maintenance
- Inspect cable armor and insulation every 6–12 months.
- Replace any sections showing signs of corrosion, cracking, or aging.
About Us - Your Trusted Cable Supplier
Dongguan Greater Wire & Cable Co., Ltd.
is a professional manufacturer and exporter specializing in power cables, control cables, and armored cables (including AC90, TECK90, and BX types).
Why Choose Us:
✅ Full range of international certifications (CSA, UL, IEC)
✅ Extensive experience serving North American markets
✅ Professional pre-sales and after-sales technical teams
✅ Reliable supply and technical support for projects of all sizes
If you're looking for high-quality AC90 Cable or waterproof armored cable solutions, we're here to help.
📞 Tel / WhatsApp / WeChat:
+86 135 1078 4550 / +86 136 6257 9592
📧 Email: manager01@greaterwire.com
🏢 Company: Dongguan Greater Wire & Cable Co., Ltd.
We are committed to providing professional, efficient, and reliable cable solutions to power your success.