Accepted Answer: Type NM-B cable first began to be manufactured with color-coded jackets in 2001 to aid in identification of the conductor size. The color code that was introduced, which continues to be used today is as follows: 14 AWG – White.
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.
What color is nm-B cable?
Romex® Brand SIMpull® NM-B cable is designed for easier pulling, resulting in easier installation. The cable jacket is color-coded for quick size identification; White – 14 AWG, Yellow – 12 AWG, Orange – 10 AWG, and Black – 8 AWG and 6 AWG.
When did neutral wires become standard?
US houses built in the 1980s usually have a neutral switchbox. The national electrical code requires a neutral at most switch boxes. US houses may be built earlier than that.
What does nm-b mean on wire?
Non-Metallic Sheathed Cable
Type NM-B (Non-Metallic Sheathed Cable) is commonly used for residential wiring of luminaries, devices and appliances.
When did Romex wire become color coded?
1 Answer. Show activity on this post. Type NM-B cable first began to be manufactured with color-coded jackets in 2001 to aid in identification of the conductor size.
When did Romex become standard?
Plastic or thermoplastic nonmetallic cable such as that shown below, still referred to by many electricians as “Romex” cable, has been in use since the 1960’s and in the U.S. became very widely used in new residential construction by 1970, completely replacing fabric-based wire insulation products.
Is nm-b the same as Romex?
“Romex” is a brand name for non-metallic sheathed cable, specifically manufactured by the American company Southwire. While this company manufactures not all nm-b wires, Romex has become a general term that points to this non-metallic wire for digital printing machines, like a xerox. NM-B wiring is never used outside.
What is the difference between NM and NM-b wire?
Closely related cable types are Type NMC, which has a corrosion-resistant outer covering, and Type NMS, which contains, in addition to the usual power conductors, communications (signaling) wires. When the letter B is appended, as in NM-B cable, it indicates that the conductor insulation is rated for 90 degrees C.
What does the B mean in NM-B?
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.
What’s the difference between NM-B and UF-B wire?
The primary difference between standard NM and underground feeder (UF) cable is in the cable construction. Standard NM cable contains wires that are wrapped with paper and a relatively loose plastic sheath. UF cable has wires that are completely encased in solid plastic.
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.
Can UF-B cable be exposed?
The use of UF cable on the exterior surface of buildings or structures is permitted by Sec. 225.10(18) and Sec. 334.10(3) of the NEC. If the cable is exposed to physical damage it must be protected in accordance with Sec.
Can I bury UF-B cable?
UF-B may be directly buried or installed where exposed to sunlight. When used as an NM cable it must comply with the requirements in NEC 2008 and NEC 2011 Article 334.
Can nm b wire be used outdoors?
Answer: No, Type NM cable cannot be installed outside, regardless of the wiring method enclosing it. The installation is a damp or wet location. Reference: 334.12(B)(4) not permitted in a wet or damp location, 300.9 Raceways in Wet Locations Above Grade.
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.
Can outdoor Romex be used indoor?
While the electrical wire meant for outdoor use can be used indoors, it would be dangerous to use indoor wires outside. Indoor wire is designed for use within the house and is not prepared to handle the external factors found outdoor such as temperature, moisture and even chemicals in some cases.
Can you use gray Romex inside?
The answer is a resounding yes. In fact, the National Electrical Code (NEC) calls for all non-metallic wires to be used in conduits to avoid protection from physical damage; especially if stripped.
