0000005762 00000 n Does the NEC refer to grounding incorrectly in any of its articles? Ampacities can be determined by tables as provided in (B) or under engineering supervision as noted in 310.15(C). 0000004049 00000 n Table 310.15(B)(2)(a). 0000045381 00000 n

If you have any questions, Conductors for General Wiring. Article 310 hugely changed from the 2008 revision (the original writing of this article) to the 2017 revision (the current revised article you are reading now). (B) Ampacities of Conductors Rated 2001 to 35,000 Volts. 0000045759 00000 n google_ad_slot = "4369167888"; For ambient temperatures other than 30°C (86°F), multiply the allowable ampacities shown above by the appropriate factor shown below.

(2) Selection of Ampacity. With engineering supervision 2 AWG or larger grounded neutral conductors can be run parallel in existing installations. 5. Do you know the difference between bonding and grounding? D2(c) Optional Calculation for One-Family Dwelling with Heat Pump(Single-Phase, 240/120-Volt Service) (See 220.82), Example D3(a) Industrial Feeders in a Common Raceway, Example No. 0000001895 00000 n

0000054011 00000 n For dry and damp locations use Types FEP, FEPB, MTW, PFA, RHW, RHH, RHW-2, SA, XHH, XHHW, XHHW-2, THHN, THW-2, THW, THHW, THHW-2, THWN, THWN-2, TW, Z, or ZW. Article 90 precedes Chapter One, and establishes the authority of the NEC. FPN Note 1: See Appendix B, Table B.310.11 for adjustment factors for more than three current-carrying conductors in a raceway or cable with load diversity. google_ad_client = "ca-pub-8084219556731616"; For example; There is no need to consider two travelers to a 3-way switch as two current carrying conductors since only one of the two can be energized at any given time. All conductors and cables must have marked on them the maximum rated voltage, the proper letter type, the manufacturer's name or trademark, the AWG size or circular mil area, and cable assemblies where the neutral conductor is smaller than the ungrounded conductor. And the note under the table now makes it clear that the table also applies to spare conductors. Number of Current-Carrying Conductors Percent of Values inTables 310.16 through310.19 as Adjusted for Ambient Temperature if Necessary 4–6 80 7–9 70 10–20 50 21–30 45 31–40 40 41 and above 35 (b)More Than One Conduit, Tube, or Raceway. A 60 percent adjustment factor shall be applied where the current carrying conductors in these cables that are stacked or bundled longer than 600 mm (24 in.) Electrical Code NEC-Table310-16 Summary: Table 310-16. D10 Feeder Ampacity Determination for Adjustable-Speed Drive Control [See 215.2, 430.24, 620.13, 620.14, 620.61, Tables 430.22(E), and 620.14], Example No. Refer to this section in the NEC® for specific types where marker tape is permitted, which cables can have the size located elsewhere, and suffix designations for number of conductors. xref comments, or concerns, please write to sales @ mindconnection.com. Special characteristics can be surface-marked on conductors listed in Chapter 3.

on the pervasiveness of confusion and the potential costs of same. This is typical for services and feeders, but not very typical for branch circuits. Questions and answers written by

google_ad_width = 728; Chapter 8 provides the requirements for communications systems. D9 Feeder Ampacity Determination for Generator Field Control, Example No.

the National Electrical Code. 340.116. It does so in a special case, which is Article 648 Sensitive Electronic Equipment. 0000001850 00000 n Article 310 hugely changed from the 2008 revision (the original writing of this article) to the 2017 revision (the current revised article you are reading now). When conductors of different systems, as provided in Section 300.3, are installed in a common raceway or cable the derating factors shown in Table 310.15(B)(2)(a) shall apply to the number of power and lighting (Articles 210, 215, 220, and 230) conductors only. 0000046461 00000 n Code Quiz: Article 310, Part 1. 2011 NEC versus 2014 NEC. 0000003004 00000 n These are the ten Article 310 items we deem most important, based

How can you tell if a conductors is permitted for use in wet sign in for electrical continuing education courses. Insulated conductors must be in accordance with Tables 310.13 and 310.61 through 310.64. (a) The purpose of this Article is to assure that conductors have mechanical strength, insulation, and ampacity adequate for The size markings should be on the surface and spaced not more than 610 mm (24 in.) Don't ground where you should bond. This article is not a substitute for the NEC. Questions and answers written by Mark Lamendola, who has worked as a master electrician, electrical inspector, and design engineer. OL�-� endstream endobj 3245 0 obj<>/Size 3233/Type/XRef>>stream You must select from the column that shows the cable (identified by the insulating material letter designation) you intend to use, and choose between copper and aluminum. (C) Ungrounded Conductors. Table 310.20. comments, or concerns, please write to sales @ mindconnection.com. 0000011718 00000 n Remember other applicable codes, rules, standards, and references: Codebookcity is a subsidiary of Mindconnection, LLC. 2. for eight types of cables.

0000008441 00000 n trailer 0000023026 00000 n Industries We Serve. 0000015486 00000 n

(b) More than One Conduit, Tube, or Raceway. This Table applies to situations where you have Hint: Look in the NEC, Article 100. The same numbers of conductors have to be used in each raceway or cable. (1) General. 0000016843 00000 n Often, spare conductors will eventually turn into current carrying conductors in the future. Derating factors shall not apply to underground conductors entering or leaving an outdoor trench if those conductors have physical protection in the form of rigid metal conduit, intermediate metal conduit or rigid nonmetallic conduit having a length not exceeding 3 mm (10 ft.) and the number of conductors does not exceed 4. Table 310.15(B)(3)(a) Adjustment Factors for More Than Three Current-Carrying Conductors. Table 310.16.

6h�ta�|�N����'ɞ���""4YX{3��Ž�6�7� W���G�|���j��� ��yQ�1�� M�]�孎�]L>�7�)w'H��� 1Z.6}+��. standard sizes). 0000002453 00000 n In a parallel set of conductors each conductor is counted as a current-carrying conductor. If installed as a substitute for NM cable, the insulation must be rated at 90°C (194°F). With the 2017 revision, 310.15(B)(19) replaces Table 310.19. Flame retardant; moisture, fugus, and corrosion resistant, suitable for direct burial in earth. Table 310.15(B)(6). A grounding or bonding conductor shall not be counted when applying the provisions of Section 310.15(B)(2)(a). 0000017828 00000 n H��VMo\7��Щ���EJ�&h��f����&���&�M���/;C����R�C����p��nr8�M The feeder conductors to a dwelling unit shall not be required to be larger than its service-entrance conductors. For voltages up to 2000, it is 14 AWG for copper and 12 AWG for aluminum or copper-clad aluminum. You'll find many more tables after the aforementioned. If you have any questions, 0000059450 00000 n /* 728x20Leaderboard */ Article 310 is to be used for general requirements for wiring, but not in areas where it is part of an integral device such as a motor, motor controller, or where covered in another part of the NEC®. International Codes (if applicable to the installation).

With engineering supervision the following formula can be used to calculate ampacities: = conductor temperature in degrees Celsius (°C), = ambient temperature in degrees Celsius (°C), = dc resistance of conductor at temperature TC, = component ac resistance resulting from skin effect and proximity effect, = effective thermal resistance between conductor and surrounding ambient. without proper spacing and not in a raceway, the ampacities shall be reduced as shown in the following table Table 310.15(B)(2)(a).

(3) Bare Conductors or Covered Conductors. Certain cables can use marker tape inside the cable. A neutral conductor that carries only the unbalanced current from other conductors of the same circuit need not be counted when applying the provisions of Section 310.15(B)(2)(a).

For these installations, if cables are bundled for a continuous length longer than 24 in., the allowable ampacity of each conductor must be reduced as shown in Table 310.15(B)(3)(a). (c) Not more than 20 current carrying conductors are bundled, stacked, or supported on "bridle rings.". Article 310 is arguably the most misunderstood and misapplied area of The exceptions to this are listed on the bottom of the table. 0000013010 00000 n

0000022186 00000 n 0000014921 00000 n

Ampacities for Conductors Rated 0-2000 Volts. q�s�/�e>��sÆ��ZWi)]Y_:%�y]!gn}ٓ,>1�����)�䶼���V���ݱ��^Sى��_n@���J��>�qU������q�8*����4h�z�$"Rޚ�>�C���"�߫��5 0 0000015439 00000 n

(grounding) and Article 430 (motors). Use only Type RHW, TW, THW, MTW, RHW-2, THW-2, THHW, THHW-2, THWN, THWN-2, XHHW, XHHW-2, ZW, or a type listed as such for a wet location, or a moisture impervious metal-sheathed conductor. The table now applies to spare conductors. Table 310.15(B)(3)(a) comparrison. Equipment grounding conductors must be as noted in Section 250.119. 0000001378 00000 n In the 2008 revision, these requirements were in 310.4. C$�,A��W0��~�gxܔF�AK�;e�=8��s�?>���.$��*ר��}ؼ�n�~a���FC��Ed�=#��2ɵ�.�����v�_ϛ�n��}Uz�zSR*�6�8n����N��z>�›�ӗ�R>>����~w�pعy

Based on the 2011 NEC. 0000014476 00000 n Does the NEC refer to grounding incorrectly in any of its articles? For applications of this section, the main power feeder shall be the feeder(s) between the main disconnect and the lighting and appliance branch circuit panelboard(s). locations? Do you know the difference between bonding and grounding? Sheath. 0000002245 00000 n

Spacing between conduits, tubing, or raceways shall be maintained. Derating factors shall not apply to conductors in nipples having a length not exceeding 610 mm (24 in.).

This Table provides the allowable ampacities of (not more than three) insulated conductors rated up to (and including) 2000V when supported on messenger cable. This article covers general requirements for conductors and their type designations, insulations, markings, mechanical strengths, ampacity ratings, and uses. Minimum sizes are shown in Table 310.5 except as permitted in other sections of the Code®.

Table 310.15(B)(3)(a) comparrison. With over 30,000 products sold annually, Houston Wire & Cable provides its customers with knowledgeable market and product application experts, standard same-day shipments, 99.99% order accuracy and on-time delivery, and 24/7/365 service. Table 310.15(B)(3)(a) provides adjustment factors when installing more than three current-carrying conductors (CCC). 0000034114 00000 n "&������ܐ�����a�#�@k\���������L�����@�`I��(�u@ks! This Table provides the allowable ampacities of single insulated conductors rated up to (and including) 2000V. 0000034462 00000 n



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