Extract From IEEE 1138-1994

Recognized as an American National Standard (ANSI) IEEE Std 1138-1994
IEEE Standard Construction of

Composite Fiber Optic Overhead Ground
Wire (OPGW) for Use on Electric Utility
Power Lines
Sponsor
Power Communications Committee
of the
IEEE Power Engineering Society
Approved March 17, 1994

IEEE Standards Board
Approved August 26, 1994

American National Standards Institute
Abstract: The construction, mechanical and electrical performance, installation guidelines, acceptance
criteria, and test requirements for a composite overhead ground wire with optical fibers, commonly known
as OPGW are discussed.
Keywords: fiber optic cable, multimode fiber, optical cable, optical ground wire, single-mode fiber, rated
breaking strength, stranded metallic wires
The Institute of Electrical and Electronics Engineers, Inc.

345 East 47th Street, New York, NY 10017-2394, USA
Copyright © 1994 by the Institute of Electrical and Electronics Engineers, Inc.
All rights reserved. Published 1994. Printed in the United States of America.
ISBN 1-55937-422-5
No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the
prior written permission of the publisher
GROUND WIRE (OPGW) FOR USE ON ELECTRIC UTILITY POWER LINES IEEE Std 1138-1994
EIA/TIA 455-169A- 1992, Chromatic Dispersion Measurement of Single-Mode Optical Fibers by the Phase-Shift
Method.
EIA/TIA 455-170-1989, Cable Cutoff Wavelength of Single-Mode Fiber by Transmitted Power.
EIA/TIA 455-173-1990, Coating Geometry Measurement for Optical Fiber, Side-View Method.
EIA 455-174-1988, Mode Field Diameter of Single-Mode Optical Fiber by Knife-Edge Scanning in the Far Field.
EIA/TIA 455-175A-1992, Chromatic Dispersion Measurement of Single-Mode Optical Fibers by the Differential
Phase-Shift Method.
IEEE Std 524-1992, IEEE Guide to the Installation of Overhead Transmission Line Conductors (ANSI).4
TIA/EIA 455-176-1993, Method for Measuring Optical Fiber Cross-Sectional Geometry by Automated Grey-Scale
Analysis.5
TIA/EIA 455-177A-1992, Numerical Aperture Measurement of Graded-Index Optical Fibers.
3. OPGW and components
3.1 Description
The composite fiber optic overhead ground wire shall be made up of buffered flexible glass optical
telecommunications fibers contained in a protective central fiber optic unit surrounded by concentric-lay stranded
metallic wires in single or multiple layers. The dual purpose of the composite cable is to provide the electrical and
physical characteristics of conventional overhead ground wire while providing the optical transmission properties of
optical fiber.
3.2 Stranded metallic wires
a) The basic construction shall have bare concentric-lay stranded metallic wires with the outer layer having left-
hand lay unless otherwise specified by the purchaser.
b) The stranded wires may be of multiple layers with a combination of various metallic wires within each layer.
The direction of lay shall be reversed in successive layers.
c) The wires shall be so stranded that when the complete OPGW is cut, the individual wires can be readily
regrouped and then held in place by one hand.
d) The preferred length of lay of the various layers of wires is 13.5 times the outside diameter of that layer, but
the length of lay shall not be less than 10 nor more than 16 times this diameter.
e) The rated breaking strength of the completed OPGW shall be taken as 90% of the sum of the rated breaking
strengths of the individual wires, calculated from their nominal diameter and the appropriate specified
minimum tensile strength.
f) At the manufacturer's option, the rated breaking strength may include the strength of the optical unit. In this
case, the manufacturer shall notify the customer if the fiber optic unit is considered a load bearing tension
member when determining the total rated breaking strength of the composite conductor.
g) The finished wires shall contain no joints or splices unless otherwise agreed upon between the manufacturer
and the purchaser.
h) Hybrid designs not included in items a)-f) are not excluded from this standard.
4IEEE publications are available from the Institute of Electrical and Electronics Engineers, 445 Hoes Lane, P.O. Box 1331, Piscataway, NJ 08855-
1331, USA.
5TIA/EIA publications are available from Global Engineering.
Copyright © 1998 IEEE All Rights Reserved 3

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Recognized as an American National Standard (ANSI) IEEE Std 1138-1994

IEEE Standard Construction of

Approved March 17, 1994

Approved August 26, 1994

The Institute of Electrical and Electronics Engineers, Inc.

EIA/TIA 455-170-1989, Cable Cutoff Wavelength of Single-Mode Fiber by Transmitted Power.

TIA/EIA 455-177A-1992, Numerical Aperture Measurement of Graded-Index Optical Fibers.

3. OPGW and components

3.2 Stranded metallic wires

Copyright © 1998 IEEE All Rights Reserved 3

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