UL Specification Cables - NM-B (UL)

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Definition NM-B (non-metallic sheathed cable) may be used for both exposed and
concealed work in normally dry locations at temperatures not to exceed
90°C. 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 subject to excessive
moisture or dampness.
Voltage Rating 600 volts for both exposed and concealed applications at an operating
temperature of 90° C for dry locations.
Construction • Solid conductor of soft uncoated copper for sizes 14-10 AWG
• Stranded conductors of larger uncoated copper for sizes
8 AWG and larger
• Soft uncoated copper conductor for grounding
• 2-conductor constructions have the insulated conductors laid parallel
• Ground wire is wrapped with paper and laid parallel between the
insulated conductors
• 3- and 4- conductor construction have the insulated conductors twisted
together. When a ground wire is present, it is wrapped with paper and
twisted together with the insulated conductors
• The entire construction is wrapped with a paper separator before
applying the PVC outer jacket
• Different sizes of cables are represented by different colored PVC
jackets as follows:
• 14 AWG – White
• 12 AWG – Yellow
• 10 AWG – Orange
• 8 AWG – Black
• 6 AWG – Black
Cable Marking • UL File number
• Size
• Type (NM-B with/without ground)
• Voltage
• (UL)
• Date/time
• Manufacturer