Questions & Answers about Mi hermano anda tocando el cable de la lámpara y me pone nervioso.
Both are possible, but they do not sound exactly the same.
- está tocando = a neutral progressive: he is touching / messing with it right now
- anda tocando = often suggests someone is going around doing something, often repeatedly, casually, or in a way the speaker finds annoying
So Mi hermano anda tocando el cable... can sound a bit like:
- My brother keeps messing with the lamp cable
- My brother is there fiddling with the lamp cable
In Spain, andar + gerund is very common for this kind of nuance.
Andar + gerundio is a verbal structure that often expresses an action that is:
- ongoing
- repeated
- somewhat casual, aimless, or irritating
- sometimes spread over a period of time rather than just one exact moment
Examples:
- Anda diciendo tonterías. = He goes around saying stupid things.
- Ando buscando mis llaves. = I’m looking for my keys / I’ve been looking for my keys.
In your sentence, it makes the brother sound like he is fiddling around with the cable, not just touching it once.