can mc cable be exposed
Yes, MC (Metal-Clad) cable can be exposed—but only under specific conditions defined by the National Electrical Code (NEC). If you’ve ever wondered whether you can run MC cable across walls, ceilings, or open spaces without a conduit, this guide will explain what’s allowed, what’s not, and what to consider for a safe and code-compliant installation.
What Does “Exposed” Mean for Electrical Cable?
When electricians or inspectors say a cable is 'exposed,' they typically mean it’s not concealed inside walls, ceilings, or conduit. The cable is visible and accessible, often running along the surface of a structure.
When Can MC Cable Be Exposed?
According to NEC Article 330, MC cable is permitted to be exposed in most dry, indoor locations where it's not subject to physical damage. Here's when you can run MC cable exposed:
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In dry indoor areas like garages, basements, utility rooms, and storage spaces.
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In commercial installations such as warehouses and offices where aesthetics aren’t a concern.
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Where cable is supported properly—typically secured every 6 feet and within 12 inches of termination.
When MC Cable Should NOT Be Exposed
There are also cases where exposed MC cable is not allowed, including:
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Where the cable could be physically damaged (e.g., areas with forklift traffic, mechanical equipment, or open framing).
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Wet or corrosive environments unless it’s a special type like PVC-jacketed MC cable or MC-HL (Hazardous Location) cable.
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In outdoor installations unless it’s rated for exterior use and protected from UV and moisture.
What Types of MC Cable Are Suitable for Exposed Use?
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Standard MC Cable: Suitable for dry, protected environments when secured properly.
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PVC Jacketed MC Cable: Ideal for corrosive or damp areas, including healthcare or industrial settings.
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MC-HL Cable: For hazardous locations and outdoor use, designed to withstand oil, water, and chemical exposure.
FAQs About Exposed MC Cable
Q: Can I staple MC cable to a wall like Romex?
A: No. Use appropriate MC cable clamps or supports. Never compress the armor with staples.
Q: Can I run MC cable across ceiling joists?
A: Yes, as long as the cable is secured and protected from damage, it can run exposed across framing members.
Q: Is MC cable ever allowed outdoors?
A: Yes, but only if it's labeled for exterior use, such as with a waterproof jacket or MC-HL rating.
Key Takeaways
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Yes, MC cable can be exposed in most indoor, dry locations.
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No, it cannot be exposed in areas where it might be damaged or in wet environments without the right rating.
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Always follow NEC code, use proper support, and choose the correct type of MC cable for the job.
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