Per 450.21(C) at what rating do dry type transformers need to be installed in transformer vaults to reduce the hazard to building personnel and occupents
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21(C), addressing dry-type transformers in transformer vaults. Show more…
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Refer to the National Electrical Code ${ }^{\circledast}$ or the working drawings when necessary. Where applicable, responses should be written in complete sentences. Refer to Table 18-1, which shows the symmetrical short-circuit currents for a 300-kilovolt-ampere transformer with $2 \%$ impedance. The short-circuit current on a 208-volt system at a distance of 50 ft, using 1 AWG conductors, will be _______________ amperes.
A 480-volt transformer, equipped with coordinated thermal overload protection by the manufacturer and arranged to interrupt the primary current, shall be permitted to have primary overcurrent protection rated or set at a current value that is not more than half the rated current of the transformer for a transformer having 8% impedance.
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