Installing a CCTV camera in a conduit system of wiring in a building requires careful planning and execution to ensure that the camera is properly secured and the wiring is safely routed. Here are the general steps you can follow:

1. Plan the camera placement: Determine where you want to install the camera and ensure that it has a clear line of sight to the area you want to monitor. Consider factors such as lighting, potential obstructions, and the field of view.
2. Choose the appropriate conduit: Select the conduit that is appropriate for the environment and meets the requirements of the wiring and camera. PVC or metal conduits are commonly used in building wiring installations.
3. Run the conduit: Install the conduit from the camera location to the monitoring area, ensuring that it is securely attached to the walls or ceiling.
4. Run the wiring: Pull the wiring through the conduit and secure it to the conduit at regular intervals to prevent sagging or shifting.
5. Install the camera: Secure the camera to the wall or ceiling using the appropriate mounting hardware, ensuring that it is level and pointing in the correct direction.
6. Connect the wiring: Connect the wiring to the camera and run it to the monitoring area, ensuring that it is properly terminated and connected to the appropriate equipment.
7. Test the camera: Test the camera to ensure that it is working properly and capturing the desired footage.

It is important to note that installing a CCTV camera in a conduit system of wiring in a building can be a complex and technical process. It may be necessary to consult with a professional installer or electrician to ensure that the installation is done safely and meets local codes and regulations.