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A CT (Computed Tomography) machine is generally not considered dangerous when it's turned off and not in use. However, like any complex medical device, there are safety protocols and considerations to be aware of:

1. Radiation Safety: CT machines use X-rays to create detailed images of the body. While the machine itself doesn't emit radiation when turned off, it's essential to follow safety procedures when using the machine to minimize radiation exposure to patients and healthcare workers.

2. Electrical Safety: CT machines are powered by electricity and contain electronic components. While inactive, they pose no electrical hazard. However, during maintenance or servicing, proper precautions should be taken to ensure electrical safety.

3. Physical Safety: CT machines are large and heavy pieces of equipment. There may be risks associated with moving or handling them, especially during installation, maintenance, or relocation.

4. Environmental Considerations: Some components of CT machines may contain materials that could be harmful to the environment if not handled or disposed of properly. This includes things like lead shielding and electronic components.

In summary, while a CT machine itself is not inherently dangerous when turned off, it's essential to follow appropriate safety procedures and guidelines when using, maintaining, or handling the equipment to ensure the safety of patients, healthcare professionals, and the environment.