Which of the following measures cannot be used to protect camera cables against water?

The correct answer is A because cutting off unnecessary pigtail cables is not a valid waterproofing method and can actually compromise device integrity and long-term reliability. In installation practice, pigtails are retained as part of the camera’s original interface design, and the emphasis is placed on proper handling and protection , not removal. The material specifically warns that “When moving the devices, use hands and do not lift the pigtails” , which reflects that pigtails are treated as protected connection elements rather than disposable parts. It also stresses correct cable outlet orientation, for example, “The strobe light and flash light cannot be installed upside down. The cable outlet must be vertically at the bottom” , showing that water protection relies on installation method and cable routing.

From a field engineering perspective, waterproofing is achieved by sealing exposed connectors with waterproof tape, protecting cable joints thoroughly, and forming a drip loop so water flows away from the connector rather than into it. These are standard outdoor installation controls. Therefore, B, C, and D are all valid anti-water measures, while A is not.