702.5 Transfer Equipment. Transfer equipment shall be
suitable for the intended use and designed and installed
so as to prevent the inadvertent interconnection of normal
and alternate sources of supply in any operation of
the transfer equipment. Transfer equipment and electric
power production systems installed to permit operation
in parallel with the normal source shall meet the requirements
of Article 705.
Transfer equipment, located on the load side of branch
circuit protection, shall be permitted to contain supplemental
overcurrent protection having an interrupting rating sufficient
for the available fault current that the generator can
deliver. The supplementary overcurrent protection devices
shall be part of a listed transfer equipment.
Transfer equipment shall be required for all standby systems
subject to the provisions of this article and for which an
electric utility supply is either the normal or standby source.