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NESC Winter Storm Rule 250B

Panel Session Agenda. Introduction of Accepted Changes

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NESC Winter Storm Rule 250B

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    9. NESC Winter Storm (Rule 250B) Combined Ice and Wind Loading Heavy (0.5-in. radial ice, 40 mph wind, 0 F) 4 lbs. per sq. ft. wind pressure load (projected area) Medium (0.25-in. radial ice, 40 mph wind, 15 F) 4 lbs. per sq. ft. wind pressure load (projected area) Light (0-in. radial ice, 60 mph wind, 30 F) 9 lbs. per sq. ft. wind pressure load (projected area)

    10. Extreme Wind Map (Rule 250C)

    11. ASCE 7-98 Extreme Wind Map 50 year recurrence (0.02 annual probability) Gusts (3-second average) Open terrain (ASCE Exposure C) 33 ft. elevation Includes Velocity Pressure Exposure Coefficient & Gust Response Factors Height Span length

    12. Wire tensions determined at 60 F (15 C) Not required for structures ? 60 ft. height (distribution, )

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