Below are some general guidelines from the ACE Fourth Edition Personal Trainer Manual.
Recommended Training Volumes
General Muscle Fitness: 1-2 sets of 8-15 reps
Muscular Endurance: 2-3 sets of greater than or equal to 12 reps
Muscular Hypertrophy: 3-6 sets of 6-12 reps
Muscular Strength: 2-6 sets of less than or equal to 6 reps
Power:
Single-Effort Events: 3-5 sets of 1-2 reps
Multiple-Effort Events: 3-5 sets of 3-5 reps
Rest Intervals Between Sets
General Fitness: 30-90 seconds
Muscular Endurance: less than or equal to 30 seconds
Muscle Hypertrophy: 30-90 seconds
Muscular Strength: 2-5 minutes
Power:
Single-Effort Events: 2-5 minutes
Multiple-Effort Events: 2-5 minutes
*A high-effort set of resistance exercise reduces the muscle's internal energy stores of creatine phosphate (phosphagen energy system). Replenishment of these local energy substrates is relatively rapid, with 50% renewal within the first 30 seconds, 75% renewal within the first minute, and 95% renewal within the first two minutes. For most practical purposes and general muscular conditioning, one-minute rest intervals between successive exercise sets are sufficient.