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Shiyou-Surveillance Camera Lightning Protection Technology and Construction Q & A

2012-08-13

TOP1: Does the outdoor metal pole camera need to be insulated from the pole?
No, and a reliable equipotential bonding is required. When a metal pole is subjected to a direct lightning strike or a lightning current is released, a magnetic field is generated around the metal pole. When this magnetic field reaches a certain strength, it will discharge nearby electronic equipment. However, after the camera housing is connected to the metal pole, it does not exist. Potential difference; the camera is safer.


TOP2: How to minimize the cost of grounding?
First, make full use of natural grounding bodies (building foundations, pipes, metal fences, etc. that have reliable contact with the earth). Secondly, when the natural grounding body fails to meet the requirements, an artificial grounding body should be appropriately added; the distribution of the artificial grounding body should reasonably avoid the natural grounding body, and the combination should be reasonable. Thirdly, the design of the artificial grounding body should fully consider the local geography and geological structure; choose the most reasonable method to make the ground network.

TOP3: Is the lightning arrester connected to a dedicated ground wire, or is it directly connected to a support rod?
First, make full use of natural grounding bodies (building foundations, pipes, metal fences, etc. that have reliable contact with the earth). Secondly, when the natural grounding body fails to meet the requirements, an artificial grounding body should be appropriately added; the distribution of the artificial grounding body should reasonably avoid the natural grounding body, and the combination should be reasonable. Thirdly, the design of the artificial grounding body should fully consider the local geography and geological structure; choose the most reasonable method to make the ground network.

TOP4: What is equipotential bonding? What about the equipotential bonding of the camera?
GB50057-94 equipotential connection definition: connect separate devices, conductive objects, etc. with equipotential bonding conductors or surge protectors to reduce the potential difference caused by lightning currents between them.
In terms of camera equipotential, equipotential refers to the metal casing, rack, metal tube, slot, shielded cable outer layer, equipment antistatic grounding, safety grounding, SPD grounding terminal, etc. Should be connected to the equipotential bonding terminal. The purpose of equipotential bonding: to reduce the potential difference between the components of the equipment and the zero potential reference point of the unified system.

TOP5: Under what circumstances do outdoor cameras need to be protected against lightning?
If the outdoor camera is installed at the top corner of a building, or on an isolated high pole in an open area, and it has been subjected to a direct lightning strike, it is recommended that direct lightning protection be required. Usually cameras installed on both sides of urban roads and under the eaves of buildings do not need to be protected from direct lightning strikes.


TOP6: How to shield the camera line?
In order to avoid coupling phenomenon on the lines and mutual inductance current between the lines, the lines need to be shielded; at the same time, both ends of the shield are grounded. The circuit wiring is erected with metal shielded wire trunking, and the two ends of the wire trunking are grounded. The metal wire trunking joint needs to be bridged.

TOP7: Is the camera only a power source, or is it just a video / control protection, okay?
Nope. Each camera has at least two parts of power / video signal, and the camera with PTZ control also has PTZ control circuit. It is not comprehensive to do only power supply or only video / control line protection. Lightning overvoltage can enter the equipment from any unprotected line, causing equipment damage.

TOP8: How to do grounding?
For the grounding of outdoor cameras, because the environment is more variable and complex, generally a simple ground network is built around the pole, or a nearby ground network that meets the requirements is introduced, or it is connected to other nearby grounding metals; distance Generally cannot exceed 20 meters.

TOP9: Is the lightning protection project completed when the lightning protection device is installed?
Lightning protection is a systematic project that includes external lightning protection measures and internal lightning protection measures. External lightning protection measures include: lightning receptors, down-conductors, grounding devices, and shared grounding systems. Internal lightning protection measures include: shielding (isolation), equipotential bonding, reasonable wiring, and installation of surge protectors (SPD). Therefore, installing a lightning protection device is not the same as a lightning protection project. Installing a lightning protection device is only part of the lightning protection project.

   TOP10: The grounding wire of the lightning arrester is directly connected to the down conductor to lead the line.
The ground wire of the lightning arrester is directly connected to the down conductor of the lightning rod. Under the premise that the equipotential measures are perfect, the voltage is raised and lowered at the same time, so it will not lead to lightning. Because the lightning protection device connects the external line of the device with the ground line, and the device shell is connected with the down-conductor; when the potential of the down-conductor is raised, the potential of the line is also raised, and the voltage changing.

This article is reprinted from the Internet and organized by Shiyou Camera. Shiyou is a leading surveillance camera brand. Lightning protection cameras and dot matrix cameras are the main products of Shiyou brand. For more details, please visit the Shiyou camera product page.