CenturyLink Technical Publication

1 CenturyLink Technical Publication Power Equipment and Engineering Standards Copyright 1996 - 2015 77385 Printed in Issue K All Rights Reserved July 2015 PUB 77385 Notice Issue K, July 2015 NOTICE All requirements in this document are effective from the Publication date of the document forward. This document should be used in conjunction with CenturyLink Technical Publications 77350, 77351, 77355, and 77354; Telcordia Recommendations; Alliance for Telecommunications Industry (ATIS) documents; American National Standards Institute (ANSI) documents; Institute of Electrical and Electronics Engineering (IEEE) standards; Federal Communications Commission (FCC) rules; the National Electrical Code (NFPA 70); Underwriters Laboratories Requirements; Department of Labor - Occupational Safety and Health Standards (OSHA 29 CFR, Part 1910).

2 And Federal, State, and local requirements including, but not limited to, statutes, rules, regulations, and orders of ordinances imposed by law. Detail engineering for CenturyLink sites shall meet all of the above references, as well as CenturyLink Standard Configuration Documents. The origin of this Technical Publication 77385 was in 1996. Prior to that point, power requirements for USWEST were contained in Module C of Technical Publication 77351. CenturyLink reserves the right to revise this document for any reason, including but not limited to, conformity with standards promulgated by various governmental or regulatory agencies; utilization of advances in the state of the Technical arts; or to reflect changes in the design of equipment, techniques, or procedures described or referred to herein.

3 Liability to anyone arising out of use or reliance upon any information set forth herein is expressly disclaimed, and no representation or warranties, expressed or implied, are made with respect to the accuracy or utility of any information set forth herein. This document is not to be construed as a suggestion to any manufacturer to modify or change any of its products, nor does this Publication represent any commitment by CenturyLink to purchase any specific products. Further, conformance to this Publication does not constitute a guarantee of a given supplier's equipment and/or its associated documentation. Ordering information for CenturyLink Technical Publications can be obtained from the Reference Section of this document.

4 PUB 77385 Comments Issue K, July 2015 COMMENTS PLEASE TEAR OUT AND SEND YOUR COMMENTS/SUGGESTIONS TO: CenturyLink Power Tech Support 700 W. Mineral Ave, Littleton, CO 80210 fax: (303) 707-9041 E-mail: Information from you helps us to improve our Publications. Please take a few moments to answer the following questions and return to the above address. Was this Publication valuable to you in determining our requirements? YES NO Was the information accurate and up-to-date? YES NO Was the information easily understood? YES NO Were the contents logically sequenced? YES NO Were the printed pages legible?

5 YES NO If you answered NO to any of the questions and/or if you have any other comments or suggestions, please explain: (Attach additional sheet, if necessary) Name Date Company Address Telephone Number Email _____PUB 77385 Table Of Contents Issue K, July 2015 TOC i CONTENTS Chapter and Section Page 1. General Requirements and Definitions .. 1-1 General .. 1-1 Reason For Reissue .. 1-2 Requirement Applicability .. 1-2 AC Requirements .. 1-3 AC Surge Suppression .. 1-7 Generic Technical Requirements .. 1-7 NEBS Requirements .. 1-10 Generic Alarming Requirements .. 1-12 2.

6 DC Power Plants and Rectifiers .. 2-1 Overview .. 2-1 General DC Power Plant Requirements .. 2-1 Charging Equipment (Rectifiers) and Their Controller .. 2-6 Engineering Guidelines .. 2-9 Example of Proper Calculation and Usage of List 1 and List 2 Drains .. 2-12 Power Board Panel and Fuse Numbering for New Plants .. 2-16 Conventional Controller .. 2-17 3. Batteries .. 3-1 Overview .. 3-1 General Description .. 3-1 Battery Discharge Characteristics .. 3-1 Battery Recharge Characteristics .. 3-3 Ventilation of Battery Areas .. 3-4 Battery Configurations .. 3-5 Battery Types .. 3-6 Selection.

7 3-10 Sizing .. 3-11 Battery Stands and Connections .. 3-12 Metal Stands, Trays, and Compartments/Boxes .. 3-12 Round Cell 3-13 Battery and Stand Installation and Intercell 3-14 Battery Disconnects .. 3-18 Table Of Contents PUB 77385 Issue K, July 2015 TOC-ii CONTENTS (Continued) Chapter and Section Page 4. Converters .. 4-1 General .. 4-1 Alarm Features .. 4-1 Technical Requirements .. 4-1 Line 4-3 Introduction to Line-Powering .. 4-3 Nominal Line-Powering Voltages .. 4-3 Pairs and Wire Gauges Used in Line-Powering .. 4-4 Line-Powering Current and Power Limits .. 4-6 Transmission Power Loss.

8 4-7 Human Susceptibility Thresholds for Voltage and Current .. 4-8 Safety Precautions for Line-Powering Voltages Above 60 .. 4-9 Current-Limiting of Higher Voltage Ground Faults .. 4-10 Additional Concerns Above 300 VDC Across the Pairs .. 4-11 5. Inverters (DC/AC) .. 5-1 General .. 5-1 Inverter Selection .. 5-2 Load Classification .. 5-2 Alarm Features .. 5-2 Technical Requirements DC and AC Power Supplies .. 5-3 6. Uninterruptible Power Supplies (UPS) .. 6- 1 General .. 6- 1 Definition of Terms .. 6- 1 Technical Requirements .. 6- 3 Alarming and Control .. 6- 5 7. Standby Engine-Alternators.

9 7- 1 General .. 7- 1 Site AC Power Systems .. 7- 3 Sizing and Ratings .. 7- 4 Alternator Technical Requirements .. 7- 5 Control Cabinet and Transfer System Requirements .. 7- 6 Additional Engine Requirements .. 7- 11 Voltage and Frequency Regulation .. 7- 12 PUB 77385 Table Of Contents Issue K, July 2015 TOC iii CONTENTS (Continued) Chapter and Section Page Additional Paralleling Requirements .. 7- 14 Alarms and Shutdowns .. 7- 15 Fuel and Lubrication Systems .. 7- 18 Exhaust System Requirements .. 7- 24 Starting Systems .. 7- 25 Cold Starting Aids .. 7- 25 Acoustic Noise .. 7- 25 Cooling System.

10 7- 27 Safety .. 7- 28 Hazardous Voltages .. 7- 29 Portable Engines and Trailers .. 7- 30 Portable Engine Connections .. 7- 30 8. Power System Monitor/Controller ( PSMC) and Battery Monitors .. 8- 1 General .. 8- 1 Standard Monitor and Control Points .. 8- 2 Primary Power Plant .. 8-2 Rectifiers .. 8-3 Batteries .. 8-4 Converter Plants .. 8-5 Inverters .. 8-5 Residual Ringing Plants .. 8-6 Uninterruptible Power Supplies (UPS) .. 8-6 Standby Engines and Transfer Systems .. 8-6 AC Power .. 8-8 Alarms .. 8- 8 Statistical Channels .. 8- 9 Energy Management and Sequencing .. 8- 9 Requirements of a PSMC for Small Sites, or Battery Monitor for UPS.