Common use of Grounding Requirements Clause in Contracts

Grounding Requirements. The maximum desired ground grid resistance for the project’s 13.2kV substation ground grid is 23 ohms for an 8,000V ground potential rise. Or, the ground grid resistance shall be no greater than that which would exceed the step and touch voltage limits of E step = 3134 volts and E touch = 885 volts according to IEEE Std. 80 for a supply system clearing time of 30 cycles as a minimum. The Generator-Owner is responsible to limit the ground potential rise (GPR) for communication conductors entering their substation that must be safeguarded and mitigate the zone of influence (ZOI) for point where the GPR is 300 volts peak asymmetrical of the voltage variations on the surface of the earth considering all systems connected having earth return paths. The Generator-Owner should consider the effects of lightning when designing surge protection for the telecommunications equipment. Refer to IEEE Std. 80 for design of a substation ground grid. The Generator-Owner shall provide the results of the ground grid design calculations and the test results for the ground grid resistance Effective Date: 6/23/2013 - Docket #: ER13-1320-000 - Page 43 NYISO Agreements --> Service Agreements --> SGIA No. 1988 between Niagara Mohwak and WM Renewable Energy according to ESB’s 752 and 753. The Company recommends the 4-point Fall-of-Potential Method of testing; refer to IEEE Std. 81 for testing method standards. Madison County LFGTE Interconnection Study rev11 21 2008.doc Page 7 of 15 rev. Nov. 21, 2008 Effective Date: 6/23/2013 - Docket #: ER13-1320-000 - Page 44 NYISO Agreements --> Service Agreements --> SGIA No. 1988 between Niagara Mohwak and WM Renewable Energy

Grounding Requirements. The maximum desired ground grid resistance for the project’s 13.2kV substation ground grid is 23 ohms for an 8,000V ground potential rise. Or, the ground grid resistance shall be no greater than that which would exceed the step and touch voltage limits of E step = 3134 volts and E touch = 885 volts according to IEEE Std. 80 for a supply system clearing time of 30 cycles as a minimum. The Generator-Owner is responsible to limit the ground potential rise (GPR) for communication conductors entering their substation that must be safeguarded and mitigate the zone of influence (ZOI) for point where the GPR is 300 volts peak asymmetrical of the voltage variations on the surface of the earth considering all systems connected having earth return paths. The Generator-Owner should consider the effects of lightning when designing surge protection for the telecommunications equipment. Refer to IEEE Std. 80 for design of a substation ground grid. The Generator-Owner shall provide the results of the ground grid design calculations and the test results for the ground grid resistance Effective Date: 6/23/2013 - Docket #: ER13-1320-000 - Page 43 New York Independent System Operator, Inc. - NYISO Agreements --> - Service Agreements --> - SGIA No. 1988 between Niagara Mohwak and WM Renewable Energy according to ESB’s 752 and 753. The Company recommends the 4-point Fall-of-Potential Method of testing; refer to IEEE Std. 81 for testing method standards. Madison County LFGTE Interconnection Study rev11 21 2008.doc Page 7 of 15 rev. Nov. 21, 2008 Effective Date: 6/23/2013 - Docket #: ER13-1320-000 - Page 44 New York Independent System Operator, Inc. - NYISO Agreements --> - Service Agreements --> - SGIA No. 1988 between Niagara Mohwak and WM Renewable Energy