They’re very similar in most regards, but there is one big difference between the two cables. In the electrical world, AC or BX cables do not come with a ground wire while MC cables do. … Both are essentially just names for armored cable.

What is the difference between armored cable and MC cable?

Armored cable (AC) first appears in the 1903 NEC. … The biggest difference between the two cable systems is that MC has full size ground wire while AC uses a combination of the jacket and a thin bonding strip or wire to function as the equipment ground.

What is MC cable used for?

Type MC cables are widely used in 600 volt and MV power, lighting and fixture whip control applications. They are permitted for use on services, feeders and branch circuits for power, lighting, control and signaling circuits in accordance with Article 330 and 725 of the NEC.

Can BX cable be used as ground?

Romex is one popular brand of NM electrical cable. A chief distinction between BX and NM is that BX can achieve grounding through the outer metal casing. This casing needs to be attached to metal boxes. Another distinction is that some types of BX cable can be installed in exposed locations, either indoors or outdoors.

Can I run MC cable outside?

The interlocking metal tape armor Type MC cable is required to have a bare or insulated equipment grounding conductor in addition to any other conductors within the cable. … These cables can be installed either indoors or outdoors and in exposed and concealed locations.

What does BX wire mean?

2) BX: BX is also known as Armor Clad or Flexible Metal Conduit cable. BX contains one or more individually insulated “hot” conductors, one individually insulated neutral conductor, and a ground wire, which may or may not be individually insulated. BX is also known as Armor Clad or Flexible Metal Conduit cable.

What's better BX or Romex?

Romex cables are about 25% cheaper than their BX counterparts. A BX is difficult and heavy to handle. Romex cables are light and have a slippery coating that enables them to be easily pulled through holes. BX cables are safer and protect against any accidental penetrations.

Where is MC cable required?

Type MC cable installed on the bottom of floor or ceiling joists must be secured at every joist and not be subject to physical damage [Sec. 330.15].

When was BX wiring used?

BX wiring (also known as armored cable) is the 2nd generation of wiring used in homes. It first appeared in the 1903 National Electrical Code (NEC) book. It became popular in the 1920s, and it was the main wiring type by 1932.

Can you wire a house with MC cable?

MC Cable Permitted Uses MC Cable, when listed and labeled for use, can be a wiring method in locations such as: Commercial, industrial, and residential/commercial buildings.

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Can MC cable get wet?

PVC coated, sunlight resistant, direct burial rated MC cable can be used in a wet location. … General use MC cables cannot be used in wet locations but there are some types of specialty MC cables that can. The most common is the PVC coated, sunlight resistant, direct burial listed MC cable in the image.

Can MC cable be painted?

The quick answer is “yes,” but let’s cover some of what you’ll need to know first. Painting the armor does not violate the National Electric Code (NEC), however, this process can be time consuming and also create more cleanup on the job-site utilizing pre-painted armor saves time and labor.

Can you use MC cable underground?

The Metal Clad Cable includes a grounding wire and can be used in outdoor applications. It can go into concealed and unconcealed spaces, and even buried underground. The National Electric Code (NEC), it is also approves it for difficult locations that involve exposure to moisture and hazardous elements.

Can MC cable be surface mounted?

New for the 2017 NEC Code-cycle is section 330.15, entitled “Metal-Clad Cable: Type MC Exposed Work.” This new Code section requires an exposed run of MC Cable to closely follow the surface to which it is mounted while enjoying a new permission that allows the MC cable to be installed on the underside of floor joists.

Does MC cable need conduit?

Romex can be installed indoors with no conduit in certain applications. However, it is often easier and more cost-effective to use MC cable in most situations where a conduit would be required. MC cable comes with built-in protection, so it can be run indoors without a conduit.

Is MC waterproof?

STAYING SAFE WITH THICK BITUMINOUS COATINGS FROM MC With MC’s thick bituminous coatings, you are always on the safe side. They adapt perfectly to the substrate or soil and, with polymer-modified bitumen, even protrusions, light shafts and abutments can be waterproofed – quickly, simply and reliably.

How far can you run BX cable?

You can easily find spools of BX cable up to 1,000 feet long. The actual gauge for your project will depend upon the length and the operating load to be fed at the far end.

Is BX wire copper or aluminum?

Armored cable, referred to as Type AC cable or BX Electrical Cable is one of the original styles of flexible conduit used as an alternative to pipe and wire installations. … A 16 AWG (American Wire Gauge) bare aluminum bond wire is used along with the armor as the ground path.

Should I replace BX wiring?

BX is much safer If there is an issue it is inside the flexible conduit and that metal conduit is quite a bit of protection. Replacing breakers may or may not be possible with your existing panel and again your wiring is in conduit so I would not be concerned.

What is MCI a cable?

In the late 2000’s, a new style of Type MC Cable was designed that incorporated full-sized bare aluminum ground wire plus the armor as the equipment grounding means. This cable was referred to as Type MCI-A, referencing the style of fitting needed in order to ensure the bonding wire was properly installed.

Can MC cable be used with plastic boxes?

MC Cable Is for Metal Boxes Only! Plastic or fiberglass electrical boxes aren’t designed to be used with MC cable. Even if you’re able to rig up a connection to a plastic box, you will fail the electrical inspection.

How often do you strap Romex?

General Cable Support Runs of NM cable must be supported at least every 54 inches. 1 They also must be secured within 12 inches of an electrical box that includes a cable clamp or within eight inches of a box or enclosure without a cable clamp.

Can I run MC cable through drywall?

Armored cable is fine in drywall – indeed, it’s superior to NM cable, and required in many/most commercial occupancies if not using conduit.

Can MC cable be bundled?

There are roughly ten 12-2 MC cables installed in bundled configuration using nylon tie wraps. These cables are the homeruns for 20-ampere branch circuits. Appreciate your insight.

How far does MC have to be supported?

According to NEC Article 330.30, MC cable must be supported and secured at intervals of 6 feet or less (unless routed through a framing member) and cables containing four or fewer conductors sized no larger than 10 AWG must be secured within 12 inches of every termination.

How long can you run MC cable?

of every outlet box, junction box, cabinet, or fitting and at intervals not exceeding 6 ft. Type MC cable must be supported at intervals not exceeding 6 ft. Cables installed horizontally through wooden or metal framing members are considered secured and supported where such support doesn’t exceed 6 ft intervals.

Can you bury MC in concrete?

Can I install Type MC in concrete or against concrete or mortar? A. Yes, if the cable is listed for the application. Type MC cable is available with an outer PVC jacket and is permitted to be installed in parking decks, concrete pours and for direct earth burial if it is identified for such use.

What wire is Cannot be used in wet locations?

As an example, two of the most common types of wire used in residential projects are THHN and THWN. THHN is thermoplastic, highly heat-resistant (up to 90 degrees C.), and nylon-jacketed. It is not suitable for wet locations.

What wire is rated for wet locations?

If you require wiring for wet locations, you must use THWN wire. It’s important to note that now many wires in the market are dual rated both THHN and THWN, which means the wire can be used in dry, damp, or wet locations. THHN wire is rated for high heat: it can be found with insulation rating as high as 90°C or 194°F.