DETAIL ENGINEERING REQUIREMENTS Section 12, ATT-TP-76400 AT&T | January, 2012 Revised December, 2020 SECTION 12 -- POWER SYSTEMS CONTENTS PAGE 1. GENERAL ............................................................................................................................ 12-3 1.1. Introduction .................................................................................................................... 12-3 1.2. Definitions ...................................................................................................................... 12-4 1.3. Working Space .............................................................................................................. 12-6 2. DC POWER PLANTS .......................................................................................................... 12-6 2.1. General .......................................................................................................................... 12-6 2.2. Single Power Plant Architecture .................................................................................... 12-7 2.3. Dual Power Plant Architecture ...................................................................................... 12-8 2.4. Rectifiers ........................................................................................................................ 12-8 2.5. Batteries......................................................................................................................... 12-9 2.6. Flooded Lead Acid Batteries ....................................................................................... 12-10 2.7. NiCad Batteries ........................................................................................................... 12-10 2.8. VRLA Batteries ............................................................................................................ 12-10 2.9. Alternative Battery Technologies ................................................................................. 12-11 2.10. Battery Cables ............................................................................................................. 12-11 2.11. Battery Disconnect ...................................................................................................... 12-12 2.12. Emergency Power Off (EPO) ...................................................................................... 12-13 3. DC POWER CONNECTIONS, BUS BAR, AND CABLE ................................................... 12-14 3.1. Connections ................................................................................................................. 12-14 3.2. Bus Bar ........................................................................................................................ 12-15 3.3. Approved Cable ........................................................................................................... 12-16 3.4. Battery and Battery Return Leads ............................................................................... 12-16 3.5. DC Power Cable Reuse .............................................................................................. 12-17 3.6. DC Power Cable Ampacity .......................................................................................... 12-18 3.7. Vertical Power Cable Runs.......................................................................................... 12-18 3.8. Cable Color .................................................................................................................. 12-19 4. DC POWER DISTRIBUTION ............................................................................................. 12-19 4.1. Power Distribution Sources ......................................................................................... 12-19 4.2. Voltage Drop ................................................................................................................ 12-23 4.3. Protection Devices ....................................................................................................... 12-26 5. CONVERTERS (DC/DC) ................................................................................................... 12-28 5.1. Introduction .................................................................................................................. 12-28 5.2. Requirements .............................................................................................................. 12-28 6. RING, TONE, AND CADENCE PLANTS ........................................................................... 12-29 6.1. General ........................................................................................................................ 12-29 6.2. Ringing Systems .......................................................................................................... 12-29 6.3. Residual Ringing Plant - Ringing and Tone Distribution ............................................. 12-29 7. INVERTERS (DC/AC) AND UNINTERRUPTABLE POWER SYSTEMS (UPS) ............... 12-29 7.1. General ........................................................................................................................ 12-29 7.2. Inverter ......................................................................................................................... 12-30 12-1 Section 12, ATT-TP-76400 DETAIL ENGINEERING REQUIREMENTS Revised February, 2020 AT&T | January, 2012 7.3. UPS .............................................................................................................................. 12-30 7.4. UPS Battery Applications ............................................................................................. 12-31 8. AC POWER DISTRIBUTION (DUPLICATE OF ATT-TP-76300 SECTION M-8) .............. 12-31 8.1. General ........................................................................................................................ 12-31 8.2. AC Panels .................................................................................................................... 12-31 8.3. AC Cable and Power Cords ......................................................................................... 12-32 8.4 Conduit ......................................................................................................................... 12-33 8.5. Appliance Outlets/ AC Test Receptacles ..................................................................... 12-35 8.6. Intra-Rack Strips .......................................................................................................... 12-37 8.7. Branch Circuits ............................................................................................................. 12-39 8.8. AC Circuit Protection Devices ...................................................................................... 12-40 TABLE 12-1 – SUMMARY OF CHANGES IN SECTION 12 Revision Date Item Action Requirements Change Notification 1/5/2016 7.1.1 Modification ATT-TP-76400-156 1/5/2016 7.2.2 Modification ATT-TP-76400-157 1/5/2016 7.4.1 Modification ATT-TP-76400-158 1/5/2016 8.3.1 a) Modification ATT-TP-76400-159 1/5/2016 8.3.1 b) Modification ATT-TP-76400-160 1/5/2016 8.4.7 i) Addition ATT-TP-76400-161 1/5/2016 8.5.4 Modification ATT-TP-76400-162 1/5/2016 8.6.2 Modification ATT-TP-76400-163 1/5/2016 3.1.3 Modification ATT-TP-76400-176 1/5/2016 4.1.22 Modification ATT-TP-76400-177 1/5/2016 7.3.2 Modification ATT-TP-76400-178 1/5/2016 7.3.3 Modification ATT-TP-76400-179 1/5/2016 7.3.4 Modification ATT-TP-76400-180 8.5.7 1/5/2016 Modification ATT-TP-76400-181 (Table 12-11) 3/3/2016 Table 12-12 Modification ATT-TP-76400-183 3/3/2016 Table 12-13 Modification ATT-TP-76400-184 6/1/2016 2.5.3 Modification ATT-TP-76400-186 12-2 DETAIL ENGINEERING REQUIREMENTS Section 12, ATT-TP-76400 AT&T | January, 2012 Revised December, 2020 12/4/2017 8.5 Modification ATT-TP-76400-209 12/4/2017 Figure 12-6 Modification ATT-TP-76400-210 10/5/2018 8.5.19 Modification ATT-TP-76400-221 10/5/2018 8.5.12 Modification ATT-TP-76400-222 10/5/2018 3.6.1 Modification ATT-TP-76400-223 12/3/2018 2.10.2 thru 2.10.6 Addition ATT-TP-76400-231 12/3/2018 3.5.1 Modification ATT-TP-76400-232 3/4/2019 2.4.1, 2.5.1, 2.8.2 Modification ATT-TP-76400-233 3/4/2019 3.1.1 Modification ATT-TP-76400-234 10/1/2019 8.6 Modification ATT-TP-76400-237 11/5/2019 4.3.14 Modification ATT-TP-76400-238 2/3/2020 4.3.14 Modification ATT-TP-76400-239 12/7/2020 2.8.2 Modification ATT-TP-76400-241 1. GENERAL 1.1. Introduction 1.1.1 This section covers the general requirements for engineering of DC Power Plants (battery/rectifiers (AC/DC)), converters (DC/DC), inverters (DC/AC), Uninterruptible Power Systems (UPS), power systems monitor/controllers, AC and DC power distribution, and ring, tone and cadence plants. See Section 16 for standby AC Plant (engine-alternator set) requirements. 1.1.2 Changes in this issue of Section 12 are summarized in Table 12-1. 1.1.3 The Detail Engineering Service Provider (DESP) shall ensure that the manufacturer’s specifications and documentation (i.e., electrical, mechanical, and maintenance documents, drawings, etc.) are provided with power equipment for turnover to local maintenance forces. 1.1.4 The DESP shall coordinate with the AT&T Engineer for the provisioning of the manufacturer’s recommended spare parts for each type of power equipment. The AT&T Engineer will work closely with GNFO in provisioning adequate spare parts based on the geographic response area. 1.1.5 The DESP shall provision alarms for all