My own equipment (computer, software licence, camera etc) in my own time for my own wedding photos.
There is no cross over.
The equipment tends not to matter though. E.g., if you are a software develop and you develop software at home on your own computer that is some way linked with what you do at work you are immediately in danger of IP infringement and need to be sensible.
Conversely, using the companies computer to do something unrelated is generally perfectly fine, but care must be taken with say a company car or more specialized equipment. A camera would likely come under that.