75.5 All exposed conductive surfaces shall be tested for leakage currents. The leakage currents from
these surfaces shall be measured to the grounded supply conductor individually as well as collectively and
from one surface to another where simultaneously accessible. Parts are considered to be exposed
surfaces unless guarded by an enclosure providing protection in accordance with Clause 5. Surfaces are
considered to be simultaneously accessible when they can be readily contacted by one or both hands of
a person at the same time. These measurements do not apply to terminals operating at voltages which
are considered to be low-voltage.