I was replacing an outlet and saw this. It Looks like a wire got split in half and joined together to create a new outlet. Is it safe?
This is obviously unsafe. There are two problems:
- Safety: the wires are uninsulated at their joints and present a shock hazard.
- Connection: the wires are twisted together with no screw clamping. As they oxidise the resistance will increase and may over time develop into a hotspot with arcing and potential to start a fire.
In the USA it is a code violation to have two wires joined together anywhere except inside a box. If an outlet is abandoned, the joined wires would still need to be in a box with a cover on it. It might be a code violation to abandon the outlet because that would result in fewer outlets than required for the room. You may find similar code requirements in your area.
It's good. Just apply some more insulating tape. I disagree on answer posted by Transistor, the wire wrapping method gives the best contact, better than screw contact. Even today you we use wire twist connectors, which is just an evoultion of twist and insulating tape. No oxidizing or bu..it happens, this happens if you bind two different materials, like screw, tin,...Just twist firmly two copper wires together and you'll forget forever. Wasn't this working until now? Sure it was, becuse it's the right way of doing it.