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Type NM-B (Non-Metallic Sheathed Cable) is commonly used for residential wiring of luminaries, devices and appliances. Type NM-B ampacity limitation shall be in accordance with the 60ºC conductor temperature rating, as specified in the NEC.
Can you use nm-b outside?
Under the 2008 code, you must use UF cable anytime NM-style cable (even in conduit) exits the side of the house. That is, you are no longer allowed to put NM-B cable in watertight conduit outside of the house in wet locations.
What is the difference between NM and NM-b wire?
Type NM is identified by the size of the conductors and number of them. For example, the very commonly used Type NM 12-2 cable contains two 12 American Wire Gauge (AWG) insulated conductors. When the letter B is appended, as in NM-B cable, it indicates that the conductor insulation is rated for 90 degrees C.
What is the B in NMB wire?
Indoor NMB cable or Romex® 12/2 cable NMB stands for non-metallic because it has a PVC jacket instead of a metal-clad jacket. It is a basic indoor electrical wire used to deliver power from an electrical box to lights, outlets and appliances.
Is NMB the same as Romex?
NM-B is a non-metallic sheathed cable designed with residential applications in mind. “Romex” is a brand name for non-metallic sheathed cable, specifically manufactured by the American company Southwire.
Can type nm-b wire be run in conduit?
7 Answers. Yes, NM cable can be in conduit. In fact. NEC calls for it to be in conduit, when protection from physical damage is required.
Can nm wire be run in conduit?
While the National Electrical Code does not expressly forbid inserting NM cable inside conduit, it is, in practice, very difficult to do so and very few professional electricians will do such an installation.
Can type NM-B Romex be exposed to corrosive vapors?
Section 334.12(B) does not allow type NM cable to be installed in wet locations or where exposed to corrosives such as chlorine but without the revised code language, sections 334.10 and 334.12(B) were in conflict with one another.
Can I use UF-B instead of NM-B?
UF electrical wire is perfectly suitable for most NM-B applications, though it is unnecessary to use it because it is too expensive for indoor applications. When used as NM, UF-B has to comply with the standards found in NEC 2008 and NEC 2011 Article 334.
When did nm-b wire come out?
Also in 1984, NM-B cable was developed and required to have 90°C rated individual conductors, and a 75°C outer jacket (see Fig.
Can Type UF-B wire be used indoors?
Types of Direct Burial Cables Type UF cable is usually gray and comes in rolls that look like standard non-metallic (NM) sheathed cable. While standard NM cable is rated only for dry, interior applications, UF cable can be used outdoors as well as indoors.
Can nm-B be exposed?
It could be installed exposed in a residential garage or in an attic or basement. In most cases, the NM cable must closely follow the building surface or another means of support for the cable must be provided.
Where do you use UF-B wire?
Type UF-B (Underground Feeder and Branch-Circuit Cable) is generally used in underground, direct burial installations as branch circuits and/or feeders to outside floodlights, sewer pumps and motors, electric gates and other loads typically supplied from a distribution system.
Why is UF b cheaper than NM?
Currently, many big box stores have the UF-B marked less than the NM-B cable. That’s because the price is not as inflated from demand like NM-B. NM-B is also used more frequently because it is WAY easier to work with.
What is Romex type NM-B?
NM-B cable is primarily used in residential wiring as branch circuits for outlets, switches, and other loads. NM-B cable may be run in air voids of masonry block or tile walls where such walls are not wet or damp locations. Voltage rating for NM-B cable is 600 volts.
What is BX wire?
What Are BX Cable and Wire? Going under alternative names such as metallic sheathed cable, type AC, MC, Greenfield, or armored cable, BX cable is a collection of plastic-coated insulated wires (typically 14- or 12-gauge), bundled together and protected by a ribbon-like metal sheathing.
Can you use Romex outside in conduit?
Running Romex in a Conduit When using any non metallic wire outdoor, including Romex, it is a good idea to run it through a conduit. Yes, they can be used outdoors, it is better to be safe than sorry. We recommend using a conduit when running the wire underground.
Does Romex need conduit in a garage?
As electrical wirings are found everywhere homeowners often wonder – can Romex be exposed in garage? The short answer to the question is – no, you should never expose your Romex wiring in your garage. You should always cover Romex wiring in your property.
Does Romex need to be in conduit outside?
Does Exposed Romex Need to Be in Conduit? When using any non-metallic wiring in an outdoor application, you should run the wiring through a conduit. Using a conduit is ideal because it is always better to add more protection to exterior wiring than not enough protection.
