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.
What is the difference between NM and NM-B?
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.
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’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.
What is UF-B wire used for?
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.
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 I put nm b wire in conduit?
Yes, NM cable can be in conduit. In fact. NEC calls for it to be in conduit, when protection from physical damage is required.
What does CU nm B mean?
NM or NM-B cables stand for “non-metallic” which aids in flexibility. The “B” denotes a heat rating of 194 degrees Fahrenheit. UF cables stand for “underground feeder” and may look similar to NM cables. Similarly, what does CU nm B W G Wire mean?
What is the difference between Romex and BX?
Romex cables are light and have a slippery coating that easily pulls through holes. BX cables are safer and protect against any accidental penetrations. Romex cables have vinyl sheathing that you can penetrate easily. A BX cable usually is grounded through an internal plastic-coated ground wire or metal armor.
Is Romex wire THWN?
Romex wire is made out of two or three THHN wires combined with a grounding bare copper wire. Like the THHN wires, Romex wire can’t be used outside because of its minimal PVC jacket protection.
Can nm-b wire be used outdoors?
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.
Can UF-B wire 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 you direct bury UF-B wire?
UF-B cable is typically used as an underground feeder cable to distribute power from an existing building to outdoor lighting fixtures, pumps, outbuildings and other outdoor equipment. The cable can also be used as direct burial cable.
Why is UF-b cheaper than nm-b wire?
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 I run UF-B cable in conduit?
Running UF cable through metal or PVC conduit.
Although not commonly done, it is allowable to run UF cable (but NOT NM) cable through metal or PVC conduit in an underground application. But it can be difficult to fish cable through conduit, unless the conduit is at least 3/4 inch in diameter.
