To: All At&T Installation Suppliers s6

AT&T INSTALLATION REQUIREMENT CHANGE NOTIFICATION - ATT-TP-76300-294 TO: ALL AT&T INSTALLATION SUPPLIERS Date: 09-30-15

EFFECTIVE DATE: 5 days from posted date or as per Supplier’s Contract

Submitter’s Name: Charles Matlack

TP: TP76300 Subject: Table M-3 Conductors Action: Add: Modification: Delete:

Section: M Section Title: Power Systems Subsection: N/A Section Title: N/A Subsection: N/A Subsection Title: N/A

Prior to Change: TABLE M-3--CONDUCTORS FOR BUS DROP TO CELL POSTS Cells AMP HR Capacity Conductors 8 HR Rate Number Size ≤ 180Ah 1 #2 AWG FLEX >180Ah ≤ 420Ah 1 #4/0 AWG FLEX >420Ah ≤ 840Ah 2 #4/0 AWG FLEX >840Ah ≤ 1900Ah 4 #4/0 AWG FLEX >1900Ah ≤ 4000Ah 4 350 MCM FLEX

Note: Table M-3 is based on one (1) hour and longer discharge rate and standard voltage drop scenarios. UPS discharge rates less than one (1) hour shall be designed for higher ampacity (consult with GES Power Staff if necessary).

Post Change: TABLE M-3--CONDUCTORS FOR BUS DROP TO CELL POSTS Cells AMP HR Capacity Conductors 8 HR Rate Number Size ≤ 180Ah 1 #2 AWG FLEX >180Ah ≤ 420Ah 1 #4/0 AWG FLEX >420Ah ≤ 840Ah 2 #4/0 AWG FLEX >840Ah ≤ 1900Ah 4 #4/0 AWG FLEX >1900Ah ≤ 4000Ah 4 350 MCM FLEX

Note: Table M-3 is based on one (1) hour and longer discharge rate and standard voltage drop scenarios for DC Power Plants.

UPS battery string cabling shall be sized to meet the UPS manufacturer’s specifications for ampacity (based on the appropriate battery discharge rate) and 2 volt loop maximum voltage drop.

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Questions relative to this IRCN should be addressed to Serena Kwong at 510-796-1097

Serena Kwong Specialist –Technical Process /Quality [email protected] Access the TP's on the Extranet Site - https://ebiznet.sbc.com/sbcnebs

Concurred Area Mgr Eng Network Quality Implementation Eng & Common Systems Date: 09-23-15 (Mike Cassidy)

Principal-Network Design Engineer (Subject Matter) Date: 08-28-15 (Charles Matlack)

Release Approved Specialist –Technical Process /Quality Date: 09-30-15 (Serena Kwong)