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Elevated Voltage Testing Metal Streetlights

Elevated Voltage Testing Metal Streetlights. Report of Findings and Recommendations. Background. Thanksgiving 2010 a dog is electrocuted on Queen Anne A second dog received a shock the previous day at the same location Two more dog-related incidents reported

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Elevated Voltage Testing Metal Streetlights

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  1. Elevated Voltage TestingMetal Streetlights Report of Findings and Recommendations February 16, 2011

  2. Background • Thanksgiving 2010 a dog is electrocuted on Queen Anne • A second dog received a shock the previous day at the same location • Two more dog-related incidents reported • City Light calls for an inspection of all its metal streetlight poles and associated metal equipment

  3. Timetable • Two contractors hired December 20, 2010 • Inspection begins December 27, 2010 • Inspection completed January 16, 2011

  4. Findings • Number of metal poles tested: 15,743 • Metal ground cover plates tested: 19,765 • Other associated equipment tested: 2,011 • Total equipment tested: 37,519 • Voltage readings of 30 and above: 56

  5. Actions Taken • All poles de-energized immediately • Replaced or repaired lamp heads, bad wires and faulty ground wires • Streetlights re-energized when repaired

  6. Causes of Elevated Voltage • Frayed wires in lamp heads and in poles • Broken photocells • Aging infrastructure and aging wires

  7. Costs • Contractors: $344,000 • City Light crews/repairs: $135,000

  8. Quality Assurance andInternal Controls • City Light inspects before commissioning streetlight system • Streetlight standards established • Condition assessment entered into asset management

  9. Next Steps • Voltage check as part of routine work • Horizon plan by 3rd Quarter • Grounding assessment and up-grade schedule • Streetlight infrastructure replacement schedule

  10. Elevated Voltage TestingMetal Streetlights Report of Findings and Recommendations February 16, 2011

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