De acuerdo con el NEC® Artículo 702, los sistemas de reserva opcionales están diseñados para suministrar energía generada en el lugar para determinadas cargas:
a. de forma manual solamente.
b. de forma automática solamente.
c. de forma manual y a criterio de la autoridad competente.
d. ya sea de forma automática o manual.
d. ya sea de forma automática o manual.
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