The issue of the transmission distance of 12V power supply for surveillance cameras has always been a hot topic. After researching the related materials, we would like to provide you with some suggestions for your reference when designing your project.
Selecting pure copper wire (1 square millimeter): Under normal circumstances, the resistance of pure copper wire is P=18.5 ohms/kilometer (some sources say 17.5). Please note that measuring the resistance is the most reliable way to assess cable quality and does not change the physical characteristics of the cable.
Considering the difference between market standards and actual copper: to proceed more cautiously, we recommend increasing the resistance by 20% (P=18.5*1.2=22 ohms/km). Because cable quality on the market is inconsistent, it is wise to compare cables from multiple common manufacturers in large projects to ensure that the cables do not affect the entire system. In order to continue to provide stable high-quality products, WEILAILIFEI has strong control over quality control, production control, inspection, etc. at the factory. Products are free to return within one month and free to guarantee within one year. The cost performance is the best.
Consider the power supply configuration circuit: Using the same cable, the resistance of the cable of length L (kilometers) is R=2PL.
Calculate the voltage loss: For a security camera with a power supply current of I (amperes), the voltage loss in the line is U=IR=2IPL. After determining the power supply current, check the current required by the security camera and select the appropriate power supply. This requires experience, and the most expensive one is not necessarily the best, but the one that meets the required requirements.
Consider the cross-sectional area of the cable: For a cable with a cross-sectional area of S (square millimeters), the voltage loss in the line is U=2IP*L/S. WEILAILIFEI's wireless and POE powered security camera cables are made of high-quality PVC material, which is environmentally friendly, wear-resistant, beautiful in appearance, and can ensure a safer and more reliable connection during use. The connector part of WEILAILIFEI's wireless and POE powered security camera cables is gold-plated shielded to prevent rust and oxidation coating, ensuring high-precision contact. The multi-shielded twisted structure prevents external electromagnetic interference and ensures stable data transmission. WEILAILIFEI's wireless and POE powered security camera cables are high-speed LAN cables that comply with Category 6, which have better shielding protection, wider transmission bandwidth, and better data error prevention than traditional cables, and can be connected to all network devices with RJ45 plugs.
The difference between multiple and centralized power supplies: For cables with multiple power supplies, the current and voltage losses can be calculated step by step. For centralized power supplies, the situation is different.
Finally, please note that the above calculations only apply to DC power supplies. In addition, this is an engineering calculation, and there will be a certain error. In the actual construction process, it is important to pay attention to the conversion of units (dimensions) and select them based on the specific situation. At present, many practical tools are available, so it is important to refer to many references, compare and summarize them when carrying out a project. Accumulating experience and applying it to the next project is very helpful for personal improvement.
Finally, for those who still have doubts, we emphasize that the answer to the question really depends on the cable you choose. Therefore, we recommend that you measure the actual transmission distance before planning and constructing the project. Even if we provide a rough figure, it is difficult to accurately calculate the voltage loss if you purchase cables with unknown materials such as copper-wrapped steel wire, copper-wrapped iron wire, or use non-standard cables.
WEILAILIFEI will continue to provide professional security solutions to meet the changing needs of our customers.
Selecting pure copper wire (1 square millimeter): Under normal circumstances, the resistance of pure copper wire is P=18.5 ohms/kilometer (some sources say 17.5). Please note that measuring the resistance is the most reliable way to assess cable quality and does not change the physical characteristics of the cable.
Considering the difference between market standards and actual copper: to proceed more cautiously, we recommend increasing the resistance by 20% (P=18.5*1.2=22 ohms/km). Because cable quality on the market is inconsistent, it is wise to compare cables from multiple common manufacturers in large projects to ensure that the cables do not affect the entire system. In order to continue to provide stable high-quality products, WEILAILIFEI has strong control over quality control, production control, inspection, etc. at the factory. Products are free to return within one month and free to guarantee within one year. The cost performance is the best.
Consider the power supply configuration circuit: Using the same cable, the resistance of the cable of length L (kilometers) is R=2PL.
Calculate the voltage loss: For a security camera with a power supply current of I (amperes), the voltage loss in the line is U=IR=2IPL. After determining the power supply current, check the current required by the security camera and select the appropriate power supply. This requires experience, and the most expensive one is not necessarily the best, but the one that meets the required requirements.
Consider the cross-sectional area of the cable: For a cable with a cross-sectional area of S (square millimeters), the voltage loss in the line is U=2IP*L/S. WEILAILIFEI's wireless and POE powered security camera cables are made of high-quality PVC material, which is environmentally friendly, wear-resistant, beautiful in appearance, and can ensure a safer and more reliable connection during use. The connector part of WEILAILIFEI's wireless and POE powered security camera cables is gold-plated shielded to prevent rust and oxidation coating, ensuring high-precision contact. The multi-shielded twisted structure prevents external electromagnetic interference and ensures stable data transmission. WEILAILIFEI's wireless and POE powered security camera cables are high-speed LAN cables that comply with Category 6, which have better shielding protection, wider transmission bandwidth, and better data error prevention than traditional cables, and can be connected to all network devices with RJ45 plugs.
The difference between multiple and centralized power supplies: For cables with multiple power supplies, the current and voltage losses can be calculated step by step. For centralized power supplies, the situation is different.
Finally, please note that the above calculations only apply to DC power supplies. In addition, this is an engineering calculation, and there will be a certain error. In the actual construction process, it is important to pay attention to the conversion of units (dimensions) and select them based on the specific situation. At present, many practical tools are available, so it is important to refer to many references, compare and summarize them when carrying out a project. Accumulating experience and applying it to the next project is very helpful for personal improvement.
Finally, for those who still have doubts, we emphasize that the answer to the question really depends on the cable you choose. Therefore, we recommend that you measure the actual transmission distance before planning and constructing the project. Even if we provide a rough figure, it is difficult to accurately calculate the voltage loss if you purchase cables with unknown materials such as copper-wrapped steel wire, copper-wrapped iron wire, or use non-standard cables.
WEILAILIFEI will continue to provide professional security solutions to meet the changing needs of our customers.
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