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PCORE bushings 115kV - 500kV are qualified to the highest performance level by the time history shake-table test per IEEE standard 693. PCORE bushings 15kV – 161kV are qualified by static pull test per IEEE standard 693. PCORE is the only porcelain bushing manufacture in the world to meet and exceed the highest performance level at 345 kV and 500kV.
http://info.hubbellpowersystems.com/500-kv-bushings-shake-table-test-reports
