Openings and slots of equipment cas

Openings and slots of equipment cases radiate disturbances into the surrounding area or into the housing, so disturbing other objects in the environment and/or transmitting electromagnetic fields from the outside into the systems.
As an example we may look at an electrostatic discharge of a
human body onto a metal plate. The arc of the electrostatic discharge not only transports a significant current, but also and corresponding wavelengths generates an electromagnetic field, which can easily reach a
field strength of 0.5 - 4 kV at a distance of less than 1 m. These electromagnetic fields can disturb the electrical system inside an inadequate cubicle via the antenna properties of the slots.
Conducting elements such as cables and slots start to radiate when their linear dimension exceeds approximately half of the wavelength. The wavelength of an electromagnetic wave and its frequency f are related via the velocity of light by their relationship