If you plug in an adapter I'd say you've set it up for use or service.Not necessarily.
We are saying this adapter is beyond the scope of the NEC.
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Definition of INSTALL
to set up for use or service; to induct into an office, rank, or order; to place in an office or dignity by seating in a stall or official seat… See the full definition
90.2 (A) Covered. This Code covers the installation and removal
of electrical conductors, equipment, .....
for the following:
(1) Public and private premises, including ....
I'd say:For example which part of the NEC protects #18 and #16 gauge extension cords feeding corded gardening tools like hedge clippers or leaf blowers?
240.5 Protection of Flexible Cords, Flexible Cables, and Fix-
ture Wires. Flexible cord and flexible cable, including tinsel
cord and extension cords, and fixture wires shall be protected
against overcurrent by either 240.5(A) or (B).