The body of the indoor armored fiber cable is obviously meant for indoor use. Multimode sends multiple light signals for shorter distances. The jacket for indoor fiber also comes in plenum and riser varieties.
Riser cables are most commonly used and found in areas where cable travels up a building and can be used as the main form of cabling in smaller buildings. Plenum on the other hand, is cabling that is used in plenum air spaces or areas of a building where unseen fires might occur. This cable is also reserved for taller multi-story buildings. These are required in building codes. For more information on Jacket varieties, check out our blog on Fiber Cable Jackets.
The indoor fiber mc cable is made up of the aluminum casing which spirals around the fibers. Underneath the aluminum casing, you will find some water blocking tape which expands if moisture makes it through the jacket.
Within the water blocking tape, you will find the fiber cores which are tight-buffered. Just like with the outdoor fiber, the indoor armored fiber is meant to deter creatures such as rodents from chewing on the fiber cores. Because indoor cable is meant to be shifted and moved constantly, the PVC jacket and cores inside are meant to be a lot more flexible than the outdoor armored fiber cable. While you may be able to get away with cutting a copper wire cable with a hacksaw, fiber cable requires a little more care.
Armored cable was first listed with Underwriters Laboratories Inc. Some will refer to this cable as Greenfield cable. There were originally two initial versions of armored cable. These two cable assemblies are very similar in construction. See note on FMC below. 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.
In some cases, electricians at that time stuck with one style of wiring throughout. But we more frequently see all three styles mixed together. You may be able to go into your basement and quickly identify the three types of wiring! Above is a great example of both BX wiring and knob-and-tube wiring working together.
Notice the two black wires knob and tube leaving the same junction box as the BX wires metal covered wires. This evaluation will identify where each kind of wiring is located. For more information about our evaluation, please click here. Depending on your budget, there are cases when we can preserve one kind of wiring but replace the others. We often see this option when homes have both BX and knob-and-tube wiring. Customers may only want to replace the knob and tube and leave the BX wiring.
If so, a free in-home estimate will be just the ticket! To give a free estimate, we will shut down ALL the visible BX wiring in the electrical panel, walk through the home together, and identify all the outlets, lights, and switches that are now OFF.
Different forms and types of BX cables can still be found by people renovating their homes. However, some specific electrical codes or tasks require the use of BX cables. In addition, without severing or cutting the inner wire, it would be hard to cut the BX metal sheathing. The industry is filled with different types of BX cables. However, not all these cables are available for application in all circumstances. Here, you should always add an allowance of about The National Electrical Code puts the required minimum amount of cable that should extend past the junction box.
The local codes might have more requirements. It would be best if you started by cutting across the armor, excluding the spiral. As soon as the cut is about to be complete, grab the cable jacket below and above the cut and then twist it sharply. It breaks the armor without the saw getting in touch with inside wires. Since the metal edges are always sharp, you should exercise caution while cutting.
If you notice any damage, move back and redo the cut. Get rid of the threaded ring found on the connector. Most BX connectors come with a small slot or hole through which you can show the tab, tail, or tip of the bushing for the inspector to know it is there. At this point, new installations need to be inspected before permission is granted to install devices on the cables.
Repeat this step for the remaining connection at the opposite end. Finally, you can add cable supports such as brackets, clamps, and staples.
It is meant to ensure and guarantee safety. Romex is an NM type of cable having non-metallic sheathing and is commonly used for residential wiring purposes.
Below are NEC regulations that apply to Romex:. The NM Non-metallic naming refers to the out sheathing that covers individual wires being non-metallic. It is different from conduit wiring or metallic sheathed cables, which involve individual conductors being protected and surrounded by a metal conduit or metal coil.
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