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Static electricity countermeasures (ESD countermeasures) are becoming essential in manufacturing sites that handle electronic devices.
The basic principle of static electricity countermeasures is to ground (release to
the earth) the static electricity generated, rather than keeping it in place. All
conductors that could be electrically charged should be connected from the ground
wire to the earth.
Earthing also maintains charge balance against electrostatic induction.
When earth cannot be secured, the following method should be used.
Short-circuiting a potentially charged object and a static-sensitive device allows
two substances to become one electrostatically, with no potential difference being
created.
This results in no charge transfer and no static buildup.
This is another method to use when earth cannot be secured.
If it is impossible to connect to the earth (the planet), which has the largest
capacitance, it may be possible to secure capacitance that does not lead to electric
discharge even if some static electricity is generated.
However, as a countermeasure, this is uncertain and cannot be recommended for
routine use in actual workplaces.
If countermeasures 1 through 3 are ineffective, such as when the object is an
insulator, a static electricity removal device (ionizer) is used.
Spraying positive and negative ions enables active neutralization of charge bias.
*These countermeasures are required if surface resistance, point-to-point resistance, or resistance to a groundable point exceeds 1 × 10^10 Ω, if the material is not homogeneous, or if the structure has insulating parts.
Source: HOZAN TOOL IND. CO., LTD.
Within the EPA, ESD countermeasures must be taken for all surfaces that might come into contact with ESDS items. Countermeasures must be applied not only to work surfaces, but also to the surfaces of device storage racks and temporary storage areas for large machine peripherals.
The gripping portion of a typical tool is an insulator, but tools used within the EPA are required to have no insulator. Select tools with conductive material in the handle.
Wearing a wrist strap is one of the basic static electricity countermeasures for human workers. Workers within the EPA must wear a wrist strap. Cordless wrist straps that are available in the market are effective in preventing electric shocks, but they are ineffective in terms of device protection and should not be used.
ESD countermeasures should be applied to floor surfaces in the PA where workers and carts carrying devices pass by. The mats for floors contain reinforcing fibers that prevent stretching and tearing even after long-term laying.
Grounding is permitted on the human body to footwear to the floor for standing work where wrist straps cannot be worn. The floor in this case must be controlled by a lower resistor value in a separate system from the normal antistatic floor.