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Frequently, questions arise regarding the transmission range of a 12V power supply for surveillance cameras. After consulting various sources, we have reached a conclusion that we hope will be a reference for your design considerations.

1. **Pure Copper Wires (1 square millimeter):** The resistance per kilometer (P) is 18.5 ohms (some sources state 17.5 ohms). Resistance is a reliable indicator of cable quality. You can refer to the article "Measuring Resistance: Easily Identifying High-Quality Network Cables!" to learn more about this. The actual resistance value is the most accurate measurement of cable quality.

2. **Considering Market Deviations:** Accounting for deviations between nominal and actual copper characteristics, let's increase P by 20%. Thus, P becomes 22 ohms per kilometer. It's recommended to compare various cables from different manufacturers to make informed decisions when working on large projects.

3. **Supply Circuit Consideration:** The same cable is used for both power supply and circuit construction. The resistance of a cable over a distance (L) is R = 2 * P * L.

4. **Voltage Loss Calculation:** For a surveillance camera with a power supply current of I (amperes), the voltage loss in the line is U = I * R = 2 * I * P * L. After calculating the supply current, match it with the camera's required current and find a suitable power source.

5. **Cable Cross-Section Area (S):** For a cable with a cross-sectional area of S (square millimeters), the voltage loss in the line is U = 2 * I * P * L / S.

6. **Multiple Power Points:** For multiple-point power supply lines, calculate the current section by section and subsequently calculate the voltage loss. Centralized power supply setups differ.

**Final Thoughts:**

This calculation applies only to direct current power supply. Additionally, this is an engineering calculation and may contain some error. Be attentive to units (dimensions) during calculation (1 kilometer = 1000 meters, 1 ampere = 1000 mA). Adapt the approach based on your actual situation. Practical tools are now more accessible, and during construction, reference, comparison, and summarization are essential. Summarization is invaluable – it's not only for immediate use but also for upgrading your skills for the future.

Some might read this and still ask, "You didn't explain clearly how far it can transmit!" Ha-ha! In reality, this question has been answered clearly. The key factor is the cable you choose, which should be measured before you begin project planning. Even if you're given a value now, if you purchase a cable made of copper-clad steel or copper-clad iron, or even a non-standard cable of uncertain quality, calculations become difficult.

This article provides a method to determine how far a 12V power supply can transmit for surveillance cameras, and the crucial factor is the type of cable you select.

**From the Perspective of OOSSXX Surveillance Brand:**

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