Ansi C84.1-2006

ANSI C84.1-2006

American National Standard
for Electric Power Systems
and Equipment—
Voltage Ratings (60 Hertz)

ANSI C84.1-2006
Revision of
ANSI C84.1-1995 (R2001, R2005)

American National Standard
For Electric Power Systems and Equipment—
Voltage Ratings (60 Hertz)

Secretariat:

National Electrical Manufacturers Association
Approved December 6, 2006

American NationalStandards Institute, Inc.

ANSI C84.1-2006

NOTICE AND DISCLAIMER
The information in this publication was considered technically sound by the consensus of persons
engaged in the development and approval of the document at the time it was developed. Consensus
does not necessarily mean that there is unanimous agreement among every person participating in the
development of this document.NEMA standards and guideline publications, of which the document contained herein is one, are
developed through a voluntary consensus standards development process. This process brings together
volunteers and/or seeks out the views of persons who have an interest in the topic covered by this
publication. While NEMA administers the process and establishes rules to promote fairness in thedevelopment of consensus, it does not write the document and it does not independently test, evaluate,
or verify the accuracy or completeness of any information or the soundness of any judgments contained
in its standards and guideline publications.
NEMA disclaims liability for any personal injury, property, or other damages of any nature whatsoever,
whether special, indirect, consequential, orcompensatory, directly or indirectly resulting from the
publication, use of, application, or reliance on this document. NEMA disclaims and makes no guaranty or
warranty, express or implied, as to the accuracy or completeness of any information published herein,
and disclaims and makes no warranty that the information in this document will fulfill any of your particular
purposes or needs. NEMA doesnot undertake to guarantee the performance of any individual
manufacturer or seller’s products or services by virtue of this standard or guide.
In publishing and making this document available, NEMA is not undertaking to render professional or
other services for or on behalf of any person or entity, nor is NEMA undertaking to perform any duty owed
by any person or entity to someone else. Anyoneusing this document should rely on his or her own
independent judgment or, as appropriate, seek the advice of a competent professional in determining the
exercise of reasonable care in any given circumstances. Information and other standards on the topic
covered by this publication may be available from other sources, which the user may wish to consult for
additional views or information notcovered by this publication.
NEMA has no power, nor does it undertake to police or enforce compliance with the contents of this
document. NEMA does not certify, test, or inspect products, designs, or installations for safety or health
purposes. Any certification or other statement of compliance with any health or safety–related
information in this document shall not be attributable to NEMA andis solely the responsibility of the
certifier or maker of the statement.

ANSI C84.1-2006

AMERICAN
NATIONAL
STANDARD

Approval of an American National Standard requires verification by
ANSI that the requirements for due process, consensus, and other
criteria for approval have been met by the standards developer.
Consensus is established when, in the judgment of the ANSI Board ofStandards Review, substantial agreement has been reached by directly
and materially affected interests. Substantial agreement means much
more than a simple majority, but not necessarily unanimity. Consensus
requires that all views and objections be considered, and that a
concerted effort be made toward their resolution.
The use of American National Standards is completely voluntary; their...