When many people use the lightning surge generator, they know little about the lightning surge working grounding and protection grounding. Today we will tell you about the related knowledge.
Lightning surge generator working grounding and protection grounding
In China, the grounding of the communication bureau station often mentions two concepts: working grounding and protective grounding. It is necessary to explain these two concepts here. In the past, the internal understanding of this problem has been relatively confused, causing a lot of misunderstanding.
Lightning surge generator protection grounding: the grounding of the metal shell and other abnormal live parts of the device.
Working grounding of the lightning surge generator: In the AC/DC power supply (or in the distribution panel), the positive terminal of the output 48V DC main wiring bar is grounded. For 24 systems, it is DC 24V negative grounded.
The above explanation is consistent with the definition in the relevant specifications of the Ministry of Information Industry.
It is generally better to understand the protective grounding of equipment. However, the concept of "working grounding" is often difficult to understand correctly, and the following clarification is often easy to understand the wrong problems:
A. The concept of working grounding is not for the 48V positive (or 24 negative) power line connection of DC electrical communication equipment.
The connection of the 48V positive electrode (and the 24 negative electrode) of the DC electrical communication device to the power supply device should belong to the concept of power line connection, and should not belong to the category of ground line connection.
B. The title of "work place" is not standard
In the domestic lightning protection grounding standard, the working place is not a normative term, but in the long-term use of the norm, the concept of "working ground" is mistakenly changed to "working place" in some occasions, resulting in a certain confusion and unclear concept. In the company, the 48V positive electrode on the equipment has long been called the "working place", which is not standard.
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