I'm not sure if this is normal or not, but I wouldn't know how to practice differently in order to not put any strain on my wrists. Whenever practicing 4 octave scales or arpeggios (especially arpeggios because of the wider hand motions) I get a lot of strain put on my wrists. Specifically strain on my left wrist when I'm all the way to the right, but also a little strain on my right wrist at the start, all the way to the left.
This is because my wrist is at a very uncomfortable angle. When I'm all the way to the right, my left arm needs to stretch pretty far and it will be at an angle of about 30 degrees compared to the piano. This causes a tight angle in my wrist.
I move my body slightly from left to right so the angle becomes not as bad, but it's still an issue. I sometimes even mispress a key with my left hand because it's not in a comfortable position.
Are there any things I'm missing in my form that could release some tension in my wrists?