NFPA 70-2017

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2017

NFPA 70

National Electrical Code

International Electrical Code® Series

™

1 2 3 4 5 LSC 20 19 18 17 16

ISBN: 978-145591277-3 (SB Print)

ISBN: 978-145591278-0 (LL Print)

ISBN: 978-145591279-7 (Spiral Print)

ISBN: 978-145591280-3 (PDF)

National Fire Protection Association®

One Batterymarch Park

Quincy, Massachusetts 02169-7471

NFPA, NFPA 70, National Fire Protection Association, National Electrical Code, and NEC

are registered trademarks of the National Fire Protection Association.

IMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPA® STANDARDS

NOTICE AND DISCLAIMER OF LIABILITY CONCERNING THE USE OF NFPA STANDARDS

NFPA® codes, standards, recommended practices, and guides (“NFPA Standards”), of which the document contained herein

is one, are developed through a consensus standards development process approved by the American National Standards

Institute. This process brings together volunteers representing varied viewpoints and interests to achieve consensus on ﬁre

and other safety issues. While the NFPA administers the process and establishes rules to promote fairness in the development

of consensus, it does not independently test, evaluate, or verify the accuracy of any information or the soundness of any

judgments contained in NFPA Standards.

The NFPA disclaims liability for any personal injury, property or other damages of any nature whatsoever, whether special,

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certiﬁcation or other statement of compliance with the requirements of this document shall not be attributable to the NFPA

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ALERT: THIS STANDARD HAS BEEN MODIFIED BY A TIA OR ERRATA

Users of NFPA codes, standards, recommended practices, and guides (“NFPA Standards”) should be

aware that NFPA Standards may be amended from time to time through the issuance of Tentative Interim

Amendments or corrected by Errata. An ofﬁcial NFPA Standard at any point in time consists of the current

edition of the document together with any Tentative Interim Amendment and any Errata then in effect.

In order to determine whether an NFPA Standard has been amended through the issuance

of Tentative Interim Amendments or corrected by Errata, visit the “Codes & Standards” section on NFPA’s

website. There, the document information pages located at the “List of NFPA Codes & Standards” provide

up-to-date, document-speciﬁc information including any issued Tentative Interim Amendments and Errata.

To view the document information page for a speciﬁc NFPA Standard, go to

http://www.nfpa.org/docinfo to choose from the list of NFPA Standards or use the search feature to select

the NFPA Standard number (e.g., NFPA 101). The document information page includes postings of all

existing Tentative Interim Amendments and Errata. It also includes the option to register for an “Alert”

feature to receive an automatic email notiﬁcation when new updates and other information are posted

regarding the document.

See ALERT

IMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPA® STANDARDS

Updating of NFPA Standards

Users of NFPA codes, standards, recommended practices, and guides (“NFPA Standards”) should be aware that

these documents may be superseded at any time by the issuance of new editions or may be amended from time to

time through the issuance of Tentative Interim Amendments or corrected by Errata. An ofﬁcial NFPA Standard at

any point in time consists of the current edition of the document together with any Tentative Interim Amendments

and any Errata then in effect. In order to determine whether a given document is the current edition and whether

it has been amended through the issuance of Tentative Interim Amendments or corrected through the issuance of

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website at www.nfpa.org, or contact the NFPA at the address listed below.

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Development of NFPA Standards shall not be considered the ofﬁcial position of NFPA or any of its Committees and

shall not be considered to be, nor be relied upon as, a Formal Interpretation.

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or asserted in connection with an NFPA Standard. The users of NFPA Standards bear the sole responsibility for

determining the validity of any such patent rights, as well as the risk of infringement of such rights, and the NFPA

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patents in American National Standards (“the ANSI Patent Policy”), and hereby gives the following notice pursuant

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NOTICE: The user’s attention is called to the possibility that compliance with an NFPA Standard may

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Users of NFPA Standards should consult applicable federal, state, and local laws and regulations. NFPA does not,

by the publication of its codes, standards, recommended practices, and guides, intend to urge action that is not in

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and changes desired by the adopting authority should be noted separately in the adopting instrument. In order

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For Further Information

All questions or other communications relating to NFPA Standards and all requests for information on NFPA

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of the Secretary, Standards Council, NFPA, 1 Batterymarch Park, P.O. Box 9101, Quincy, MA 02269-9101; email:

stds_admin@nfpa.org

For more information about NFPA, visit the NFPA website at www.nfpa.org. All NFPA codes and standards can be

viewed at no cost at www.nfpa.org/docinfo.

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摘要：

NFPA 70-2017 是美国国家消防协会发布的《国家电气规范》（National Electrical Code, NEC）的2017年版本，是全球电气安装与安全领域最具权威性的标准文档之一。该规范系统规定了住宅、商业及工业场所中电气系统的设计、安装、检查与维护要求，旨在有效降低电气火灾、电击事故及相关风险。NFPA 70-2017 涵盖了从布线方法、过流保护、接地与连接，到特殊场所（如潮湿环境、危险区域）的电气安全细则，为电气工程师、承包商、检查员及安全管理人员提供了全面的合规依据。遵循该

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NFPA 70-2017

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