many people know little about lightning surge working grounding and protective grounding in the process of using lightning surge generator. today, i’ll tell you about lightning surge working grounding and protective grounding
lightning surge working grounding and protective grounding
in china, two concepts are often mentioned in the grounding of communication bureau stations: working grounding and protective grounding. it is necessary to explain these two concepts here. in the past, the understanding of this problem within the company has been relatively confused, resulting in a lot of misunderstandings.
lightning surge generator protection grounding: grounding of equipment metal shell and other abnormal live parts.
working grounding of lightning surge generator: in the ac/dc power supply (or distribution panel), the positive pole of the output dc 48v main wiring board is grounded. for 24 system, it is the negative grounding of dc 24v.
the above explanation is consistent with the definition in the relevant specifications of the ministry of information industry of china.
it is generally easy to understand the protective grounding of equipment. however, the concept of “working grounding” is often difficult to understand correctly. the following clarifies several problems that are often easy to understand incorrectly:
a. the concept of working grounding is not for the power line connection of 48v positive pole (or 24 negative pole) of dc electric communication equipment
the connection between 48v positive pole (and 24 negative pole) of dc communication equipment and power supply equipment should belong to the concept of power line connection, and should not belong to the category of grounding wire connection.
b. the address of “workplace” is not standardized
in the domestic lightning protection and grounding standards, the working place is not a normative term, but in the long-term use of the specification, the concept of “working ground” is mistakenly changed into “working place” on some occasions, resulting in some confusion and unclear concept. the 48v positive pole on the equipment has long been called “working place” in the company, which is not standardized.
for more information about lightning surge generator, please contact shanghai suoshen electronics co., ltd