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NEC 2014 Code ChangesArticles 320-370.18CHANGES FROM 2011 TO 2014 CODE ARE IN REDChapter 3 - Wiring Methods and MaterialsARTICLE 320 – Armored Cable: Type ACI. General320.2 DefinitionArmored Type ACFor a fabricated assembly of insulated conductors in a flexible interlocked metallicarmor, see section 320.100II. Installation320.10 Uses PermittedType AC cable shall be permitted as follows:(1) For feeders and branch circuits in both exposed and concealed installations.(2) In cable trays(3) In dry locations(4) Embedded in plaster finish on brick or other masonry, except in damp or wetlocations(5) To be run or fished in the air voids of masonry block or tile walls where suchwalls are not exposed or subject to excessive moisture or dampness 2014 All Star Training, Inc.1

310.12 Uses Not Permitted(1) Where subject to physical damage(2) In damp or wet locations(3) In air voids of masonry block or tile walls where such walls are exposed orsubject to excessive moisture or dampness(4) Where exposed to corrosive conditions(5) Embedded in plaster finish on brick or other masonry in damp or wet locations.320.23 In Accessible AtticsType AC cables in accessible attics or roof spaces will be installed as specified insection 320.23(A) and (B).(A) Cables Run Across the Top of Floor JoistsWhere run across the top of floor joists, or within 2.1 m (7 ft.) of floor or floorjoists across the face of rafters or studding the cable will be protected bysubstantial guard strips that are at least as high as the cable. Where this space is notaccessible by permanent stairs or ladders, protection will only be required within1.8 m (6 ft.) of the nearest edge of the attic entrance.(B) Cable Installed Parallel to Framing MembersWhere the cable is installed to the sides of rafters, studs or ceiling, or floor joists,neither guard strips nor running boards will be required, and the installation alsoadhere to section 300.4(D).320.30 Securing and Supporting(B) SecuringUnless otherwise allowed, Type AC cable will be secured within 300 mm (12 in.)of every outlet box, junction box, cabinet, or fitting at intervals not exceeding 1.4m (4 ½ ft.) where installed on or across framing members. 2014 All Star Training, Inc.2

(C) SupportingUnless otherwise allowed, Type AC cable will be supported at intervals not toexceed 1.4 m (4 ½ ft.).Horizontal runs of Type AC cable installed in wooden or metal framing membersor similar supporting means will be considered supported where such support doesnot exceed 1.4 m (4 ½ ft.) intervals.320.80 AmpacityThe ampacity will be determined by section 310.15.(A) Thermal InsulationArmored cable installed in thermal insulation will have conductors rated at 90 C(194 F). The ampacity of cable installed in these applications will not exceed thatof a 60 C (140 F) rated conductor. The 90 C (194 F) rating will be allowed tobe used for ampacity derating purposes, provided the final derated ampacity doesnot exceed that for 60 C (140 F) rated conductor.III. Construction Specifications320.104 ConductorsInsulated conductors will be of a type listed in Table 310.104(A) or thoseidentified for use in this cable. In addition, the conductors will have an overallmoisture-resistant and fire-retardant fibrous covering will be required only on theindividual conductors.320.120 MarkingThe cable will be marked according to section 310.120, except that Type AC willhave ready identification of the manufacturer by distinctive external markings onthe cable armor throughout its entire length.Article 322 – Flat Cable Assemblies: Type FCII. Installation322.12 Uses Not Permitted 2014 All Star Training, Inc.3

Flat cable assemblies will not be used as follows:(1) Where exposed to corrosive conditions unless suitable for the application(2) In hoistways or on elevators or escalators(3) In any hazardous (classified) location, except as specifically allowed by otherarticles in this Code.(4) Outdoors or in wet or damp locations unless identified for the useIII. Construction322.112 InsulationThe entire flat cable assembly will be formed to provide a suitable insulationcovering all of the conductors and using one of the materials recognized in Table310.104(A) for general branch-circuit wiring.322.120 Marking(A) Temperature RatingIn addition to the provisions of section 310.120, Type FC cable will have thetemperature rating durably marked on the surface at intervals not exceeding 60 mm(24 in.).Article 326 – Integrated Gas Spacer Cable: Type IGSII. Installation326.10 Uses PermittedType IGS cable will be allowed for use underground, including direct burial in theearth, as the following:(1) Service-entrance conductors(2) Feeder or branch-circuit conductors(3) Service conductors, underground326.112 Insulation 2014 All Star Training, Inc.4

The insulation will be dry kraft paper tapes and pressurized sulfur hexafluoride gas(SF6), both approved for electrical use. The nominal gas pressure will be 138 kPagauge (20 lb/in.2 gauge). The thickness of the paper spacer will be as specified inTable 326.112.Article 328 – Medium Voltage Cable: Type MVII. Installation328.10 Uses PermittedType MV cable will be allowed for use on power systems rated up to 35,000 voltsnominal as follows:(1) In wet or dry locations.(2) In raceways.(3) In cable trays, where identified for the use, according to section 392.10,392.20(B), (C), and (D), 392.22(C), and 392.30(B)(1), 392.46, 392.56, and 392.60.Type MV cable that has an overall metallic armor, adheres to the requirements forType MC cable and is identified as MV or MC will be allowed to be installed incable trays according to section 392.10(B)(2).(4) Direct buried in accordance with 300.50.(5) In messenger-supported wiring in accordance with Part II of Article 396.(6) As exposed runs according to section 300.37. Type MV cable that has anoverall metallic armor, adheres to the requirements for Type MC cable, and isidentified as MV or MC will be allowed to be installed as exposed runs of metalclad cable according to section 300.37.328.14 InstallationType MV cable will be installed, terminated, and tested by qualified persons.Further Information: IEEE 576-2000, Recommended Practice for Installation,Termination, and Testing of Insulated Power Cables as Used in Industrial andCommercial Applications, includes installation and testing criteria for MV cable. 2014 All Star Training, Inc.5

328.80 AmpacityThe ampacity of Type MV cable will be determined according to section 310.60.The ampacity of Type MV cable installed in cable tray will be determinedaccording to section 392.80(B).III. Construction Specifications328.100 ConstructionType MV cables will have copper, aluminum, or copper-clad aluminum conductorsand will adhere to Table 310.104(C) and Table 310.104(D) or Table 310.104(E).328.120 MarkingMedium voltage cable will be marked as required by section 310.120.Article 330 – Metal Clad Cable; Type MCII. Installation330.10 Uses PermittedType MC cable will be allowed for use on power systems rated up to 35,000 voltsnominal as follows:(1) For services, feeders, and branch circuits.(2) For power, lighting, control, and signal circuits.(3) Indoors or outdoors.(4) Exposed or concealed.(5) To be direct buried where identified for such use.(6) In cable tray where identified for such use.(7) In any raceway.(8) As aerial cable on a messenger.(9) In hazardous locations where specifically allowed by other articles in this Code. 2014 All Star Training, Inc.6

(10) In dry locations and embedded in plaster finish on brick or other masonryexcept in damp or wet locations.(11) In wet locations where a corrosion-resistant jacket is provided over themetallic covering and any of the following conditions are met:a. The metallic covering is impervious to moisture.b. A jacket resistant to moisture is provided under the metal covering.c. The insulated conductors under the metallic covering are listed for use in wetlocations.(12) Where single-conductor cables are used, all phase conductors and, whereused, the grounded conductor will be grouped together to minimize inducedvoltage on the sheath.330.30 Securing and Supporting.(A) General. Type MC cable shall be supported and secured by staples, cable ties,straps, hangers, or similar fittings or other approved means designed and installedso as not to damage the cable.(B) Securing. Unless otherwise provided, cables must be secured at intervals notexceeding 1.8 m (6 ft). Cables containing four or fewer conductors sized no largerthan 10 AWG shall be secured within 300 mm (12 in.) of every box, cabinet,fitting, or other cable termination. In vertical installations, listed cables withungrounded conductors 250 kcmil and larger shall be allowed.330.80 Ampacity(A) Type MC Cable Installed in Cable TrayThe ampacities for Type MC cable installed in cable tray will be determinedaccording to section 392.80.(B) Single Type MC Conductors Grouped Together 2014 All Star Training, Inc.7

(1) Table 310.15(B)(20) for conductors rated 0 through 2000 volts(2) Table 310.60(C)(67) and Table 310.60(C)(68) for conductors rated over 2000voltsIII. Construction Specifications330.104 ConductorsConductors will be of copper, aluminum, copper-clad aluminum, nickel or nickelcoated copper, solid or stranded. The minimum conductor size will be 18 AWGcopper, nickel or nickel-coated copper, or 12 AWG aluminum or copper-cladaluminum.330.112 Insulation(A) 1000 Volts or lessInsulated conductors in sizes 18 AWG and 16 AWG will be of a type listed inTable 402.3, with a maximum operating temperature not less than 90 C (194 F)and as allowed by section 725.49. Conductors larger than 16 AWG will be of atype listed in Table 310.104(A) or of a type identified for use in Type MC cable.(B) Over 1000 VoltsInsulated conductors will be of a type listed in Table 310.104(C) through Table310.104(B) and Table 310.104(C).Article 332 – Mineral-Insulated, Metal-Sheathed Cable: Type MIII. Installation332.10 Uses Permitted(7) In hazardous locations where specifically allowed by other articles in this Code.332.80 Ampacity(A) Type MI Cable Installed in Cable TrayThe ampacities for Type MI cable installed in cable tray will be determinedaccording to section 392.80(A). 2014 All Star Training, Inc.8

(B) Single Type MI Conductors Grouped TogetherWhere single Type MI conductors are grouped together in a triangular or squareconfiguration, as required by section 332.31, and installed on a messenger orexposed with a maintained free air space of not less than 2.15 times one conductordiameter (2.15 x O.D.) of the largest conductor contained within the configurationand adjacent conductor configurations or cables, the ampacity of the conductorswill not exceed the allowable ampacities of Table 310.15(B)(17).Article 334 – Nonmetallic-Sheathed Cable: Types NM, NMC, and NMSII. Installation334.10 Uses PermittedType NM, Type NMC, and Type NMS cables shall be permitted to be used in thefollowing, except as prohibited in 334.12:(1) One and two family dwellings and their attached or detached garages, and theirstorage buildings.(1) One- and two-family dwellings and their attached or detached garages, andtheir storage buildings.(2) Multi-family dwellings permitted to be of Types III, IV, and V construction.(3) Other structures permitted to be of Types III, IV, and V construction. Cablesshall be concealed within walls, floors, or ceilings that provide a thermal barrier ofmaterial that has at least a 15-minute finish rating as identified in listings of firerated assemblies.(5) Types I and II construction where installed within raceways allowed to beinstalled in Types I and II construction.334.12 Uses Not Permitted 2014 All Star Training, Inc.9