b) When an AC adapter satisfies all of the following conditions below.
(1) An isolation transformer having a primary rated input of less than 15 VA, with a winding
whose temperature rise under abnormal conditions does not exceed the specified limits
owing to the action of the excessive temperature rise prevention unit or other such device,
is used. (See Article 19.1.2 for the requirements concerning temperature limits of
windings.)
(2) No smoke emission or ignition occurs during the short-circuit/open-circuit test of the
secondary circuit.
c) When equipment whose power consumption rating is 15 W or less satisfies all of the following
conditions below.
(1) An isolation transformer, with a winding whose temperature rise under abnormal
conditions will not exceed the specified limits owing to the action of the excessive
temperature rise prevention unit or other such device, is used. (See Article 19.1.2 for the
requirements concerning temperature limits of windings.)
(2) No smoke emission or ignition occurs during the short-circuit/open-circuit test of the
secondary circuit.