Oufu Optical Fiber Cable Co., Ltd
Heimilisfang: Shenyang, Liaoning, Kína.
Tengiliður: Zhang stjóri
Sími: 400-964-1314
Farsíma: 86 1390405338
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2025-09-11 47
What is Metal Clad Cable? A Simple Definition
Metal clad cable, often called MC cable, is a type of electrical wiring that features insulated conductors enclosed within a flexible metal sheath. This outer armor, typically made of interlocked aluminum or steel, provides superior physical protection against punctures, impacts, and crushing. It's a versatile solution for both residential and commercial applications. Inside the metal jacket, you'll find the individual wires—black (hot), white (neutral), and a green insulated equipment grounding conductor—wrapped in a plastic vapor barrier. This makes modern metal clad cable suitable for a wider range of environments.
Why Choose MC Cable? The Top Benefits
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The number one reason to use metal clad cable is protection. That metal armor safeguards the wires from damage that could cause short circuits or fires, making it ideal for exposed locations where NM cable (like Romex) isn't allowed. Secondly, it's often easier to install than running individual wires through a rigid metal conduit (RMC), especially in retrofits or tight spaces. The flexible design bends easily around corners. FurtherMeira., its all-in-one design includes its own ground wire, simplifying the grounding process compared to older AC cable which used the armor as the ground.
MC Cable vs. ArMeira.d Cable (AC): What's the Difference?
Many people confuse MC and AC cable. While they look similar, key differences affect where you can use them.
| Feature | Metal Clad (MC) Cable | ArMeira.d (AC) Cable |
|---|---|---|
| Grounding | Has a separate, dedicated green insulated copper ground wire. | Uses a flexible aluminum armor as the grounding path. |
| Internal Wrap | Includes a plastic moisture-resistant vapor barrier. | Contains a paper wrap inside the armor, which is not moisture-resistant. |
| Common Use | The modern standard for commercial and residential exposed applications, indoors and out (if rated). | Less common, primarily found in older installations and not for damp locations. |
For almost all new projects, metal clad cable is the preferred choice due to its superior grounding and moisture resistance.
A Step-by-Step Guide to Installing MC Cable
Installing metal clad cable correctly is crucial for safety and performance.
Plan the Run & Turn Off Power: Map the path from your power source to the destination. Always shut off the circuit at the breaker box and verify power is off with a voltage tester.
Gather Tools: You'll need an MC cable cutter (or a fine-tooth hacksaw), lineman's pliers, wire strippers, and approved MC cable connectors for your junction boxes.
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Run and Secure the Cable: Feed the cable through framing, ensuring it's protected from sharp edges. Support the metal clad cable every 6 feet and within 12 inches of every junction box using listed MC cable straps.
Cut and Strip the Armor: At each box, leave at least 8 inches of cable. Slide on the connector. Use the MC cutter to score and snap the armor, then twist it off. Avoid cutting too deep to prevent damaging the inner wires.
Terminate the Wires: Strip the insulation from the individual conductors. Connect the wires to the corresponding terminals in the box: black to hot, white to neutral, and green to the ground terminal.
Common MC Cable Mistakes (⚠ Warning!)
⚠ Warning: Never use indoor-rated MC cable in damp or wet locations. You must use a type specifically listed for wet locations, which has a sunlight-resistant jacket.
⚠ Warning: Do not neglect proper securing. Unsecured cable can sag and is susceptible to damage. Follow NEC code for support spacing.
⚠ Warning: Avoid using the wrong connectors. Standard NM cable clamps are not approved for metal clad cable. You must use connectors listed for MC cable to properly secure it to boxes and prevent abrasion.
Our Experience in a Garage Workshop Retrofit
We recently helped a client power their new garage workshop. The walls were already finished with drywall, making adding new circuits a challenge. Running rigid conduit would have been messy and difficult. Instead, we used metal clad cable. We were able to fished it through the attic space and drop it down walls with minimal intrusion. The flexibility was a huge time-saver. Interestingly, the inspector noted that the dedicated ground wire in the MC cable made the installation clearer and easier to approve compared to older AC cable systems.
When Should You Not Use Metal Clad Cable?
While versatile, MC cable isn't for every situation. It is generally not approved for direct burial in the ground unless specifically listed for that purpose. For underground runs, you'd need to use a direct burial cable or run wires inside a conduit. Additionally, it should not be used where exposed to corrosive vapors or environments that could degrade the metal armor. In these cases, a non-metallic solution like PVC conduit or ENT might be a better choice.
Your MC Cable Pre-Installation Checklist
✅ Confirmed the MC cable type is correct for the location (indoor vs. wet/dry).
✅ Measured the total length needed to avoid unnecessary splices.
✅ Shut off power to the relevant circuits at the main panel.
✅ Gathered all proper tools: MC cutter, strippers, and listed connectors.
✅ Planned the run path with appropriate support points.
Conclusion: A Durable and Versatile Wiring Solution
Metal clad cable offers a fantastic blend of durability, ease of installation, and code compliance for a wide array of projects. By understanding its different types, specifically choosing it over older AC cable, and following proper installation techniques, you can ensure a safe and professional-looking electrical installation. For complex jobs or if you're unsure, always consult a licensed electrician.
Frequently Asked Questions (FAQ)
Q1: Can MC cable be exposed?
A: Yes, that's one of its primary advantages. The metal armor provides the necessary protection for exposed runs in walls, ceilings, and along the surface of framing members.Www.adsscable.cn
Q2: What is the difference between MC cable and conduit?
A: Conduit (e.g., EMT) is a hollow pipe that you must pull individual wires through. MC cable is an assembly where the wires are already pre-installed inside the armor, making it faster to install in many scenarios.
Q3: Is MC cable Meira. expensive than Romex (NM cable)?
A: Typically, yes. The added cost of the metal armor and manufacturing process makes MC cable Meira. expensive than non-metallic sheathed cable (Romex). However, it's often required by code in exposed areas where Romex is not permitted.
Q4: Can I use MC cable outdoors?
A: You can, but only if it is specifically listed for wet locations. The packaging and cable jacket will be marked for this use. Standard MC cable is for dry locations only.
Q5: How do I ground MC cable?
A: Grounding is straightforward. The dedicated green insulated ground wire inside the cable must be connected to the ground terminal in every junction box and device, just like any other ground wire. You do not use the armor for grounding.
