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substation. <br /> 10 Operational Responsibilities of Each Party: Each Party will be responsible for the operation <br /> of the equipment it owns. <br /> 11 Maintenance Responsibilities of Each Party: Each Party will be fully responsible for the <br /> maintenance of the equipment it owns. <br /> 12 Other Terms and Conditions: <br /> 12.1 Access and Physical Security <br /> 12.1.1 SMTXU and LCRA TSC are to share access to the San Marcos substation by LCRA <br /> TSC hardened locks in the gate and in the control enclosure doors. <br /> 12.1.2 Physical security and access to the San Marcos substation shall be in accordance with <br /> LCRA TSC's physical security standards. <br /> 12.2 Meterin� <br /> 12.2.1 SMTXU will supply and allow LCRA TSC use of its 12.5-kV bus potential transformers <br /> PT3 and PT4 for metering. <br /> 12.2.2 SMTXU will supply and allow LCRA TSC use of transformer Tl and T2 metering current <br /> transformers for its metering. <br /> 12.3 Relay and Control <br /> 12.3.1 SMTXU will supply and allow LCRA TSC use of transformer Tl and T2 relaying current <br /> transformers for LCRA TSC's bus differential and breaker failure relaying scheme. <br /> 12.3.2 SMTXU will provide breaker failure initiate contacts from its circuit switchers CS4975 <br /> and CS4985 relaying panel to LCRA TSC's bus differential and breaker failure relaying <br /> panel. <br /> 12.3.3 LCRA TSC will provide tripping and close inhibit contacts from its bus differential and <br /> breaker failure relaying panel to SMTXU's circuit switchers CS4975 and CS4985 <br /> relaying panels. <br /> 12.3.4 LCRA TSC will provide SMTXU access to 125 VDC and 120/240 VAC power. Circuits <br /> must have over current protection devices (OCPD) sized according to NEC standards. <br /> Panel boards containing the OCPD may belong to either LCRA TSC(if space is available) <br /> or SMTXU. <br /> 12.3.5 SMTXU will supply and allow LCRA TSC use of SS1 and SS2 for primary and backup <br /> station power. <br /> 12.3.6 LCRA TSC and SMTXU shall design,provide,and coordinate their respective protection <br /> system equipment so that adjacent zones of protection overlap, in accordance with <br /> ERCOT Nodal Operating Guides. <br /> 12.3.7 LCRA TSC will provide SMTXU with floor space(as available and as necessary) in its <br /> control house for the installation of SMTXU required panels and equipment. <br /> 12.3.8 LCRA TSC will make reasonable efforts to notify SMTXU in advance of any planned repairs <br /> or updates to LCRA TSC's system that may result in a temporary outage of the electrical <br /> operations on the SMTXU side of the San Marcos substation. <br /> 13. Project Responsibilities: <br /> 13.1 Project Name: Redwood to San Marcos Transmission Line Upgrade <br /> 13.2 Projected In-Service Date(s): June 30,2025 <br /> Fifth Amendment to the Interconnection Agreement between LCRA TSC and SMTXU Page 10 of 13 <br />