Quote Step Turn :
On many aircraft, you will find metal structure bonded to metal parts by small bonding straps. Flight controls to their flying surface being a prime example. This assures no arcing through the hinges.
Quote Wikipedia:
A
Faradaycage or
Faradayshield is an enclosure used in order toblock
electricfields. It is formed by
conductivematerial or by a mesh of such materials.
They are also used to protect people and equipment against actual electric currents such as
lightning strikes and
electrostatic discharges, since the enclosing cage conducts current around the outside of the enclosed space and none passes through the interior.