For us redirection is very complex and usually involves a long explanation, going through the action we find not favourable (as opposed to not safe, which we don't do) with the child and then giving direct and simple phrases as cues that they can use as well as dh and I.
So, pulling out the cables poses minimal risk to safety, if any, usually anyway. It's more annoying than anything else, but it's tiresome to continue to put them back. This particular issue is one we have had with each one of our boys.
What I do in these situations at that age (and earlier and later as needed), is to keep my attention on the next time he's going for the cables, and quickly join him. I crouch down next to him, facing the object of his interest, and begin a running commentary about how interesting the cables are- the colours, textures, how they wind or fall, the holes or electronics the come from, the jacks they go to, the outlet where they are plugged in, everything I can observe about it all. I encourage him to touch and look at each aspect I am expressing- one finger only please.
Then, I tell him why we keep them there and that what happens when he pulls them out- they are now not tidy and we would have to step over them, or maybe even trip on them and pull them out of their jacks, or kink them by suddenly yanking on them and such-and-such only works when the cords are in perfect condition, not yanked, not kinked, etc...
I tell him that I choose to protect our things by making sure they are tidy and out of the way so that we can continue to enjoy them. I ask him if he enjoys listening to the stereo or watching a particular movie, and when he responds that he does, I remind him that the cords have to be kept tidy in their spot for us to listen/watch.
Then I give him a phrase: We keep the cords tidy and put away. I ask him how we keep the cords and he repeats 'tidy and put away' although a less verbal child may not repeat it, I think it's still effective because if I see him going for the cords again, I can repeat just 'the cords are kept tidy and put away, please.'
Then, usually the curiosity has been sated and we do this for the next thing- the blender, for instance, or the contents of the pantry, etc...
I talk a lot
, every day, all day long. I am naturally a very quiet person who doesn't like to talk a lot at all, but having so many little people who need information has necessitated this change in my behaviour. The other thing is that when they have all of the same information that I do, I don't need to say as much as often about it as if I had kept quiet and just said, 'no, don't touch.' At every first, it's a huge outlay, but it's far more efficient, imo, than to have to continue to repeat myself ad nauseum for every new curiosity.