I guess I gotta start writing stuff not fully covered under the basic setup underneath here.
This is supposed to be a blog after all.
People ask me: how many sets am I supposed to do on my Limit days?
Well, all sets that progressively go up to your max lift(s) are considered warm-ups. You do as many as you feel necessary. A general rule of thumb is to do sets of 3 repetitions until it becomes fairly heavy, and then progress to doing sets of single repetitions until you reach your maximum. During the first mesocycle where you aim for a 3-5RM you just increase the weight until 3-5 reps is your maximum for that weight.
This is supposed to be heavy, it is supposed to be a Repetition Max for said weight, wether it be a 1RM or a 3RM. So the answer to how many sets you're supposed to do is simple: as many as it takes to reach your max. A maximum lift is a maximum lift. If your last lift was so heavy that your eyes nearly popped out of your skull, you're done.
If you're doing back squats for one of your limit days, it could look something like this written down in your training log:
Back Squat (warmup to 180kgs)
180kgs/3
190kgs/1
200kgs/1 Easy
210kgs/1 Heavy, but okay
215kgs/1 Max lift, I strained so much that my nose started to bleed
Trying to do any more lifting at the same weight would only prove as counterproductive in the long run.
You're not done yet, you still have lots of assistance exercises to do.