Electricity is indispensable in our lives because of the attachment we exhibit to electrical gadgets. There are provisions which we made to maintain constant electricity in the house but sometimes, the taste will change, and we would like to renovate houses. It could also be that we just want to sell it off and the new owner may like to have few connections. At that point, you will be nudged to do some disconnections.
Perhaps, an electrical engineer is not available but work has to be done. As a human being, everything is possible for he who believes. The initial thing is to turn off a general circuit that connects to the involved junction box is switched off. Tension at the junction box is strong enough to dry anything by electrocution. Please kindly bring a tester with a voltage sensor to check whether an electric current stills runs through the cable. Once you have confirmed that there is no electricity in the junction box, you can go ahead with your mission.
Remove all connectors attached to cables that are fixed in the junction box to pull the wires away from themselves. The inside of a junction box is the interconnection of so many extended wire cables. A normal box which is either plastic or metal has locknuts that hold the wires tightly. For a wire to come out, locknuts have to be unscrewed. Though it is possible to do it with a bare hand, it is much easier to use a screwdriver.
Once screws are loosened, you can get much access to the wire. See how the wire runs into the junction box and finds its end. Once found, gently separate it from others. When it is separated, fold detached copper linings to themselves and cover them with cello tape to avoid contact with anything. Do not forget to cover the junction box especially when still in use. Fix the junction box back to its normal position and turn on the electricity to make sure that you did not disconnect other necessary cables.
There are precautions to take while handling any electrical appliance. You must have your body dry as wet bodies can increase the chances of being electrocuted. Most junction boxes are found either in the ceiling or at the top end of a wall, you simply need a ladder or tall stool to comfortably access it. In as much as removing cable from junction box looks like what anyone can do, it is more prudent to involve the expertise of an electrical engineer.