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into the circuitry under consideration;
b. prevent electromagnetic disturbances coupled into the
circuitry to cause faults or operating errors.
The grounding system, as the way to assure the electro-
magnetic compatibility of automation and control systems
provided safety, ensures a significant reduction of risks
and costs associated with interference problems and/or
equipment damage, both direct costs, with replacement of
damaged equipment, but mainly indirect costs related to
the shutdown or malfunction, whose consequences can be
disastrous, thus justifying a systematic approach in this area.
2. THE GROUNDING SYSTEM AND ITS
RELATIONSHIP WITH THE POWER SYSTEM
The electrical potential of the power conductors relative
to the Earth's conductive surface is defined by its earthing
system, indeed the Neutral earthing scheme, which is identi-
fied by three characters XY-Z: the 1st Character X refers to
the connection of Neutral to Earth (T - directly connected to
earth; I – isolated or connected by a high impedance); the 2nd
Character Y refers to the connection between the electrical
device being supplied and Earth (T - directly connected to
Earth; N – connected to Neutral at the origin of installation,
which is connected to the Earth); the 3rd Character Z refers
to the Neutral in relation to the Protective Earth (PE), the
conductor that connects the exposed metallic parts of the
consumer's electrical installation (S - Neutral and Protec-
tive Earth separated; C - Neutral and Protective Earth in a
single/combined conductor - PEN)
This leads to the acronyms used for the different types of FIGURE 1: Mesh-IBN with bonding mat.
Notes:
1 System blocks 1, 2 and 3 are new installations conforming to the
mesh-IBN method. They may be connected to existing installations
(system 4) that use any method of bonding.
2 The SPC is the only metallic interface between the mesh-IBN and the
CBN. It must be directly connected to the reinforcement of the floor. All
cables leading to the system enter here. All conductors that are bonded
to the mesh-IBN must be connected to the SPC (e.g. cable screens,
battery return, etc.).
Credit: K-27 ITU Recommendation K.27, 1996, “Bonding configurations
and earthing within a telecommunications building”简要
保留的信号和设备通常特征被叫做电磁兼容性，他的本质将被转化成它自己的接地系统。适合的电磁兼容性能提高自动化控制系统装置，确保降低与设备故障相关的风险和费用有重要意义，设备故障的结果是损失惨重的，当选择少量“拇指规则”解决所有情况是没有影响的，因此有接近接地系统的解释。
1.接地系统的任务和目标
自动化控制系统依靠电能来满足他需要的各种过程。当设备与它生产过程被破坏，或者由于电子干扰而产生故障时，这将有安全和商业损失的风险。