>>649214If you don't have a ccw, take a chunky knife. If you think a mora is going to make the cut, stay at home. A good insulated knife can be used as a pry bar and cut cable while removing risk of electrocution. Even if you don't have an insulated knife, something sharp is better than nothing. Only carry concealed while urbexing and have the proper permits to do so. In the off chance you run in to a vagrant, or anyone for that matter, the best way to not have an issue is to just avoid it. Don't walk around abandoned structures with a polished 1911 hanging off your hip and an AR-15 over your shoulder. Taking pictures is the best stort I've heard and I've used it. Just don't lie about who you are. Don't bring booze or spraypaint, especially if you have a gun on you.
The two most valuable pieces of advice I can give you for not getting caught are: be aware of where you park and don't shine flashlights on 2nd+ story areas close to windows near or after dark. Most of the time people ignore worn down budings, but if your car is parked right out front and they see lights in the windows there will be a reason to go looking or have the cops do it for them. I've walked a mile or more to a site just to make sure I want going to be interrupted over a parking job, or worse have my ticket out towed away.
Usually a basic kit will include study clothing covering as much as the weather allows, at least running shoes if not boots for ankle support, flashlight, headlamp, gun/knife or both, camera, cellphone, id/wallet. If I an going inside something that is more than a few blocks from commonly traveled areas I will bring a small pack in case something happens. It is about 10L with basic first aid, rope, bananas, a camel back, snacks, and any small things I think I might need. Any more gear than that and your limit mobility and risk drawing attention. Don't look like a burgler and people won't think you are.