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Engineering , 17.02.2022 22:26

An installation consists of a 10-kVA, single-phase transformer with a 440-volt primary and a 110-volt, 2-wire secondary using insulation type THWN copper conductors. No secondary OCPD is installed. Calculate the maximum standard size OCPD permitted by Table 450.3(B) to protect the primary of this transformer.

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