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Is the main bus of an UT4R1131B Horizontal Ganged Meter Sockets actually rated for 205A?

Yes, per UL414 Meter Sockets Table 24.1: Minimum allowable ampere rating for four meter sockets assembled together shall be 45% of the sum of all meter socket positions. Four 100A meter sockets added together is 400A times 0.45 equals 180A minimum allowable. The UT4R1121B was actually tested for a main bus rating of 205 amps.

CTA-ID : 2022966
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