January 2012 Capital Investment - National Grid

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Exhibit ___ (EIOP-19)Page 91 of 684Pockets of Poor PerformanceThe analysis performed to address reliability concerns in small pockets along a feederhas been incorporated into the Engineering Reliability Review program, and thisprogram will be discontinued.Table IV-11Pockets of Poor PerformanceProgram Variance ($millions)CIP FY12 FY13 FY14 FY15 FY16 FY17 Total2011 0.6 0.7 0.8 0.8 0.9 - 3.82012 - - - - - - -Overhead Distribution FusingVarious projects are in place which will maintain customer reliability through theinstallation of fuses on overhead distribution lines. Fuses are installed to isolatepermanent faults on the distribution system. Ideally, these fuses are installed atlocations which limit the interruption to the fewest number of customers as possible.Proper fuse application will limit the duration of the interruption by isolating the fault to asmaller area and reducing the time required to find the fault.Drivers:Fuses isolate the faulted area of a feeder and thereby interrupt the smallest practicalnumber of customers. Outage restoration time may also be reduced since fusing willsplit the overhead circuit into smaller segments of the distribution system that requirespatrolling to locate the cause of an unplanned customer interruption.Customer Benefits:These projects will result in a reduction in the number of customer interruptions and willhelp the Company to continue to meet its service quality metrics.2011 to 2012 Variance:The Company has actively been installing fuses on its Worst Performing feeders as partof ERR evaluations. This program expands the scope of feeders being reviewed forincreased fusing opportunities across the service territory. The projected investment isshown in the table below. This program was not included in the 2011 CIP.Table IV-12Overhead Distribution FusingProgram Variance ($millions)CIP FY12 FY13 FY14 FY15 FY16 FY17 Total2011 - - - - - - -2012 - 1.8 1.8 1.8 1.8 1.8 9.0IV-15 1592
Exhibit ___ (EIOP-19)Page 92 of 684Arc Flash Mediation - 480V Spot NetworksThis strategy intends to install primary and secondary isolation devices in spot networksystems to mitigate arc flash hazard levels within 480V spot network systems.Drivers:The recently published 2012 National Electric Safety Code requires that an arc hazardanalysis be completed on the 480V spot networks operated by the Company. TheCompany’s analysis indicates that the potential incident energy for various faultsscenarios on a spot network could exceed the rating of current personal protectiveequipment. To ensure worker safety, new work methods will need to be employed.These work methods may require significant switching and customer outages for routinemaintenance. The Company will be implementing these work methods immediately andis investigating engineering controls such as the addition of isolating switches on boththe primary and secondary side of its 330 spot network protectors.Customer Benefits:Installation of primary and secondary isolation equipment will facilitate emergency androutine maintenance without interruption of service to the customer.2011 to 2012 Variance:The projected investment is shown in the table below. This program was not included inthe 2011 CIP.Table IV-13Arc Flash Mediation - 480V Spot Networks Program Variance ($millions)CIP FY12 FY13 FY14 FY15 FY16 FY17 Total2011 - - - - - - -2012 - 0.2 4.0 4.0 4.0 4.0 16.2IV-16 1693
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January 2012 Capital Investment - National Grid

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