The original date of posting appears next to each quiz listed. Adopted in all 50 states, the nec helps protect people and property from electrical hazards involving wiring and equipment. Once there, click on their link to free access to the 2017 nec edition of nfpa 70. However, this article doesnt apply to communications systems, which is covered in chapter 8, except when article 300 is speci. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Metallic cable trays that support electrical conductors shall be grounded as required for conductor enclosures in accordance with 250. In this brief video i provide an overview of the 5 new nec articles in the 2017 nec, including. The national electrical code nec does not define the proper spacing that should be maintained. National electrical code 2008 edition usf college of. However, these are periodically revised to keep up with the revisions to the nec.
A pdf copy of this nema policy is attached and may also be found on. These guidelines and information do not intend to cover all details or variations in cable tray systems nor. Before this revision, the pipe organ section had not been updated since the mid 1930s. Inumber of multiconductor cables rated 2000 volts or less in the cable tray 1 40 or larger cables the ladder cable tray must have an inside available width equal to or greater than. Cable tray systems design shall comply with nec article 392, nema ve 1, and. Branchcircuit, feeder, and service calculations article 220 branchcircuit, feeder, and service calculations i. In the 2014 nec, gfci protection requirements for specific appliances were strewn all through article 422. Solar photovoltaic systems covered by this article may be interactive. Conductor sizing and the national electrical code the national electrical code requirements for conductor sizing and overcurrent protection have always been confusing and complex. Nfpa 70, national electrical code, nfpa, and national fire protection association are registered. Nema publishes nema ve 220 cable tray installation. Solar photovoltaic system pv the total components and subsystems that, in combination, convert solar energy into electric energy suitable for connection to a utilization load. The 2017 edition of the nec includes five 5 new articles, three of which focus on the generation, distribution, and storage of electrical power, areas of considerable interest and activity in the electrical industry.
Think you can spot violations the original installer either ignored or couldnt identify. Article 300 contains the general requirements for all wiring methods included in the nec. Ip rating for electrical enclosure 11kv415v over head line specification as per rec abstract of national skip to content engineering interview questions,mcqs,objective questions,class notes,seminor topics,lab viva pdf free download. Where cables are identified for future use with a tag, the tag shall be. There are many different types of cable tray including basket, ladder and solidbottom. Tray can be manufactured in various types of material including aluminum, steel. Free online access to the nec and other electrical standards nfpa delivers free online access to all nfpa standards to enhance public safety and to serve the publics increasing interest in technical information. Without reference to electronic circuits or modem types of power supplies and plastic insulated wire, this long outdated article. Article 366 through article 392 raceways, miscellaneous. However, this article doesnt apply to communica however, this article doesnt apply to communica tions systems, which is covered in chapter 8, except when article 300 is speci. Definitions related to hazardous classified locations have been relocated from chapter 5 to article 100. Nec code references most frequently used for installing mc and ac cables. To properly interpret the code, it is necessary to understand the necs definitions to have the proper context of the rules.
Article 392 cable trays is an article dedicated to a type of mechanical support. Changes to nfpa 702008, national electrical code article. Buy nfpa 70, national electrical code nec softbound. Thank you for helping keep engtips forums free from inappropriate posts. Article 425 fixed resistance and electrode industrial process heating equipment. This edition of nfpa 70, national electrical code, was prepared by the national electrical code. Mike holts illustrated guide to understanding the national electrical code, volume 1, articles 90480, based on the 2014 nec mike holt 2014 on. All the nec practice tests are as per the nec 2014 code. Nfpa 70, national electrical code nec handbook if a digital product is offered and you select pdf or digital access, you are purchasing a license to access nfpa information electronically.
National electrical code explanations and free articles. The national electrical manufacturers association nema also publishes three standards. It is very important that the personnel involved with engineering and. Nec 2017 code changes chapter 6 special equipment changes from the 2014 code are highlighted in yellow. Derating factors shall not apply to conductors in nipples having a length not exceeding 600 mm 24 in. However, this article does not apply to signal and communications systems as covered in chapters 7 and 8. Refer to article 392 of the nec, or other applicable code for the use of power conductors and cables in cable tray. City of phoenix amendments to the 2008 national electrical code nec approved on april 1, 200. The course addresses additional code revisions that apply to all types of occupancies.
Article 430, part vi, where tapped from the load side of the motor branchcircuit protective. The bulletin is advisory in nature, informational in content, and is intended to assist employers in providing a safe and healthful workplace. A similar question was asked, and answered on the mike holt forum. The remaining articles 378 392 address specific types of raceways. This section consists of national electric code nec code practice questions which helps in learning the code easier. Article 800 is a standalone article but references article. Article 392 cable trays wiring methods and materials. Nec definition of maintained spacing for wire in free air. Chapter methods and materials mike holt enterprises.
We close with article 392, a support system, and the last string articles 394 through 398 for open wiring. Nec 2017 code changes chapter 3 wiring methods and. The following draft of nfpa 70, national electrical code. An example for the exception would be a free standing strut rack like structure. Nec 2017 code changes chapter 3 wiring methods and materials changes from the 2014 code are highlighted in yellow. I take them in the order of last updated and get the next one. These guidelines and information do not intend to cover all details or variations in cable tray systems nor provide for every possible installation contingency. Factsheet occupational safety and health administration.
Phoenix planning and development department code committee article 210 branch circuits section 210. Building construction code change proposal proposed amendments to the 2011 national electrical code section 210. There were 3,745 proposals and 1,625 public comments for. The national electrical code has been extensively revised for 2008, and woe to the contractor, builder, electrician, or any combination thereof who doesnt take heed. Free online access to the nec and other electrical standards. The limited power and voltage of these circuits is what makes them a separate and specialized wiring method. Suggested ampacities all types of insulations copper aluminum not more than 3 conductors in raceway or cable single conductor in free air not more than 3 conductors in raceway or cable single conductor in free air awg or mcm conductor temperature rating conductor temperature ratings 8590c temp 185f 110c temp 230f 8590c temp 185f 110c. The following guidelines are based on the 2002 national electrical code, article 392.
Keep in mind that you can have 4 2 wire nm cables stacked without being hurt by the derating that is necessary. Jan 10, 2015 cable tray size as per national electrical code2002. Cable tray should not be loaded more than recommended by the cable tray manufacturer. National electrical code 2008 edition this edition of nfpa 70, national electrical code, was prepared by the national electrical code committee and acted on by nfpa at its june association technical meeting held june 37, 2007, in boston, ma. Adopted in all 50 states, nfpa 70, national electrical code nec is the benchmark for safe electrical design, installation, and inspection to protect people and property from electrical hazards. Best electrical lecture notes pdf download class tutorials. Type mv cable that has an overall metallic armor, adheres to the requirements for. Safely installing, maintaining and inspecting cable trays. Cable tray is classified by the nec nfpa 70 the national electrical code as a. Table of contents viii mike holts illustrated guide to changes to the nec 2011 article 410luminaires, lampholders, and lamps 203. Nec article 725 is dedicated to specialized circuitry, different from standard power and lighting circuits. Other sections and articles of the nec are referenced throughout article 392 for specific installation and use issues. Where only qualified maintenance personnel are available, certain cables are permitted in ladder, ventilated trough, and ventilated channeltype cable trays. Copies of proposals are published in the nec rop for the 20 annual revision cycle.
The accessible portion of abandoned fire alarm cables shall be removed. Cable tray is classified by the nec nfpa 70 the national electrical code as a support system and not as a raceway. Group 3 articles 348, 350, 352, 392, global issues, chapter 9 tables. Article 392 of the nec provides the basic requirements for installations using. National electrical code 2008 edition city of ocoee. Cable tray size as per national electrical code2002. Article 392 cable trays wiring methods and materials from pocket guide to the. Nema ve 220 has been revised to reference the 2011 version of the national electrical code and provides clarification for grounding and bonding cable trays, as well as recent cable tray product developments. An indepth look at the 2005 nec, section 392 types of cable trays. Mike holts illustrated guide to understanding the national electrical code, volume 1. To protect the authenticity of your product, certain restrictions apply. The bulletin is advisory in nature, informational in content, and is intended to assist. It is suitable for anyone exposed to the nec at any level.
This article will help distinguish the differences between these circuits. It was issued by the standards council on july 26, 2007, with an effective date of august. The following draft of nfpa 70, national electrical code, 2014, incorporates the committee actions on the public and committee proposals that make up the a20 nec report on proposals. The following is a quick reference list of the most frequently used national electrical code sections used when installing armored cables. Comprehensive provisions address electrical installations in virtually all buildings including commercial, residential, and industrial occupancies. Test your knowledge of the national electrical code. A similar code change occurred in article 376 for metal wireways. Number of multiconductor cables rated 2000 volts or less. Mike holts illustrated guide to 101 essential nec rules. Cable tray systems design shall comply with nec article 392, nema ve 1, and nema fg 1 and follow safe work practices as described in nfpa 70e. Cables allowed in tray cable tray is one of the most common methods of supporting wire and cable. This section is updated regularly hence requested to visit again for more practice tests. Heres your chance to moonlight as an electrical inspector and secondguess someone elses work from the safety of your living room or office. Generally speaking raceway completely encloses the cable inside of it.
Nec practice tests electrician exams practice tests. This is a critical distinction because it means the requirements for the cable contained in raceway is different than cable supported by cable tray. Cable tray manual based on the 2014 national electrical code cable tray manual 2014 cable tray manual bline series cable tray systems man1 eaton mark shown is the property of its respective owner. Draft of proposed nfpa 70 2014 edition national electrical. The engtips staff will check this out and take appropriate action. Safely installing, maintaining and inspecting cable trays this safety and health information bulletin shib is not a standard or regulation, and it creates no new legal obligations. Number of multiconductor cables rated 2000 volts or less in. Nec requirements 218 nec requirements reprinted with permission from nfpa 70hb14, the national electrical code. While the nfpa does allow such quotes, it does so only for the purposes of education regarding the. Individual articles will have additional definitions.
732 893 784 1070 654 949 252 568 1368 928 1002 978 1591 1627 1501 681 156 1164 253 288 495 1319 1267 1387 772 353 123 199 544 920 602 675 461 1162 53 998