Chapter 3 Wiring Methods and Materials

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ARTICLE 310 - CONDUCTORS FOR GENERAL WIRING 310.11 310.6 Shielding. Solid dielectric insulated conductors operated above 2000 volts in permanent installations shall have ozone-resistant insulation and shall be shielded. All metallic insulation shields shall be CO~tedtQJI,~+ ingelectrode"cQ~~/~ ,bushart' Or.
310.12 ARTICLE 310 - CONDUCTORS FOR GENERAL WIRING (1) The maximum rated voltage. (2) The proper type letter or letters for the type of wire or cable as specified elsewhere in this Code. (3) The manufacturer's name, trademark, or other distinctive marking by which the organization responsible for the product can be readily identified. (4) The AWG size or circular mil area. FPN: See Conductor Properties, Table 8 of Chapter 9, for conductor area expressed in SI units for conductor sizes specified in AWG or circular mil area. (5) Cable assemblies where the neutral conductor IS smaller than the ungrounded conductors shall be so marked. (B) Method of Marking. (1) Surface Marking. The following conductors and cables shall be durably marked on the surface. The AWG size or circular mil area shall be repeated at intervals not exceeding 610 mm (24 in.). All other markings shall be repeated at intervals not exceeding 1.0 m (40 in.). (1) Single-conductor and multiconductor rubber- and thermoplastic-insulated wire and cable (2) Nonmetallic-sheathed cable (3) Service-entrance cable (4) Underground feeder and branch-circuit cable (5) Tray cable (6) Irrigation cable (7) Power-limited tray cable (8) Instrumentation tray cable (2) Marker Tape. Metal-covered multiconductor cables shall employ a marker tape located within the cable and running for its complete length. Exception No.1: Mineral-insulated. metal-sheathed cable. Exception No.2: Type AC cable. Exception No.3: The information required in 31O.11(A) shall be permitted to be durably marked on the outer nonmetallic covering of Type MC, Type lTC, or Type PLTC cables at intervals not exceeding 1.0 m (40 in.). Exception No.4: The information required in 310.11(A) shall be permitted to be durably marked on a nonmetallic covering under the metallic sheath qf Type ITC or Type PLTC cable at intervals not exceeding 1.0 m (40 in.). FPN: Included in the group of metal-covered cables are Type AC cable (Article 320). Type MC cable (Article 330), and lead-sheathed cable. (3) Tag Marking. The following conductors and cables shall be marked by means of a printed tag attached to the coil, reel, or carton: (1) Mineral-insulated, metal-sheathed cable (2) Switchboard wires (3) Metal-covered, single-conductor cables (4) Type AC cable (4) Optional Marking of Wire Size. The information required in 310. 11 (A)(4) shall be permitted to be marked on the surface of the individual insulated conductors for the following multiconductor cables: (1) Type MC cable (2) Tray cable (3) Irrigation cable (4) Power-limited tray cable (5) Power-limited fire alarm cable (6) Instrumentation tray cable (C) Suffixes to Designate Number of Conductors. A type letter or letters used alone shall indicate a single insulated conductor. The letter suffixes shall be indicated as follows: (1) D - For two insulated conductors laid parallel within an outer nonmetallic covering (2) M - For an assembly of two or more insulated conductors twisted spirally within an outer nonmetallic covering (D) Optional Markings. All conductors and cables contained in Chapter 3 shall be permitted to be surface marked to indicate special characteristics of the cable materials. These markings include, but are not limited to, markings for limited smoke, sunlight resistant, and so forth. 310.12 Conductor Identification. (A) Grounded Conductors. Insulated or covered grounded conductors shall be identified in accordance with 200.6. (B) Equipment Grounding Conductors. Equipment grounding conductors shall be in accordance with 250.119. (C) Ungrounded Conductors. Conductors that are intended for use as ungrounded conductors, whether used as a single conductor or in multiconductor cables, shall be finished to be clearly distinguishable from grounded and grounding conductors. Distinguishing markings shall not conflict in any manner with the surface markings required by 31O.11(B)(1). Branch-circuit ungrounded conductors shall be identified in accordance with 21O.5(C). Feeders shall be identified in accordance with 215.12. Exception: Conductor identification shall be permitted in accordance with 200.7. 310.13 Conductor Constructions and Applications. Insulated conductors shall comply with the applicable provisions of Table 310. 13(A) thrl:>ul1rb"1rab:le~~10~13(E). 7()-140 NATIONAL ELECTRICAL CODE 2008 Edition
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Page 3 and 4: 300.5 ARTICLE 300 - WIRING METHODS
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Page 43 and 44: 314.4 ARTICLE 314 - OUTLET, DEVICE,
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Page 55 and 56: 324.60 ARTICLE 326 - INTEGRATED GAS
Page 57 and 58: 328.100 ARTICLE 330 - METAL-CLAD CA
Page 59 and 60: 332.1 ARTICLE 332-MINERAL-INSULATED
Page 61 and 62: 334.12 ARTICLE 334-NONMETALLIC-SHEA
Page 63 and 64: 336.1 ARTICLE 336 - POWER AND CONTR
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338.24 ARTICLE 340 - UNDERGROUND FE
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342.28 ARTICLE 344-RIGID METAL COND
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344.42 ARTICLE 348 - FLEXIBLE METAL
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348.42 ARTICLE 350 - LIQUIDTIGHT FL
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352.12 ARTICLE 352 - RIGID POLYVINY
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352.60 ARTICLE 353 - HIGH DENSITY P
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354.12 ARTICLE 354-NONMETALLIC UNDE
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355.22 ARTICLE 355 - REINFORCED THE
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356.6 ARTICLE 356 - LIQUIDTIGHT FLE
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358.22 ARTICLE 360 - FLEXIBLE METAL
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362.1 ARTICLE 362 - ELECTRICAL NONM
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366.1 ARTICLE 366 - AUXILIARY GUTTE
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368.1 ARTICLE 368 - BUSWAYS (I) Sui
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368.214 ARTICLE 370 - CABLEBUS IV.
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372.4 ARTICLE 374 - CELLULAR METAL
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376.12 ARTICLE 376-METAL WIREWAYS 3
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378.30 ARTICLE 382 - NONMETALLIC EX
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382.56 ARTICLE 384- STRUT-TIPE CHAN
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384.120 ARTICLE 386-SURFACE METAL R
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390.1 ARTICLE 390 - UNDERFLOOR RACE
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392.4 ARTICLE 392 - CABLE TRAYS the
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392.9 ARTICLE 392 - CABLE TRA YS si
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392.11 ARTICLE 392 - CABLE TRAYS Ta
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394.10 ARTICLE 394 - CONCEALED KNOB
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398.10 ARTICLE 398 - OPEN WIRING ON
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Chapter 3 Wiring Methods and Materials

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