WHAT HAPPENS IF A PLAYER GOES INTO THE OPPONENT’S SPACE UNDER THE NET?
Center-line penetration rules are designed to protect athletes and prevent collisions at the net. While USA Volleyball (USAV), the National Collegiate Athletic Association (NCAA), and the National Federation of State High School Associations (NFHS) all address player penetration under the net, the rules differ depending on the level of play.
Understanding these differences can help players, Coaches, and parents recognize what constitutes legal and illegal play.
PENETRATING UNDER THE NET
Under USA Volleyball rules, a player may penetrate into the opponent’s space under the net as long as the penetration does not interfere with an opponent’s play or create a safety hazard.
For the feet, some part of the penetrating foot must remain in contact with or directly above the center line. If the entire foot crosses the center line into the opponent’s court, the player has committed a fault.
For body parts above the feet, including the hands, arms, or torso, penetration into the opponent’s space is permitted when it does not interfere with an opponent’s play or create a safety hazard.
Referees consider the location of the ball and the players involved when determining whether penetration has interfered with play. The key consideration is whether the physical contact or penetration impedes an opponent’s ability to make a play on the ball.
As players move into the fall season, many will compete under NFHS rules. NFHS rules address center-line penetration differently from USAV rules. A player’s foot or feet may touch the center line, but complete encroachment over the center line with any part of the body can result in a fault when it compromises the safety of an opponent making a legitimate effort to play the ball.
For players who move on to college, the NCAA instituted a rule change for the 2026 women’s volleyball season. When a player’s entire foot completely crosses the center line, it is ruled an immediate fault. The update creates a more objective standard for determining foot penetration. Coaches can also use video review to challenge whether an opponent’s foot completely crossed the center line.
Rule Application
| Rule Application | USAV Rulebook | NCAA Volleyball | NFHS Volleyball |
|---|---|---|---|
| Foot Encroachment | Allowed if any part of the foot touches or is directly above the center line. | Fault if the entire foot completely crosses the center line. | Allowed to touch the line but cannot fully cross. |
| Above-the-Foot Penetration | Allowed if there is no opponent interference or safety hazard. | Allowed unless it causes a hazard or interferes with play. | Subject to restrictions regarding encroachment and player safety. |
| Subjectivity Factor | Referee judgment is used to determine interference and safety concerns. | The 2026 update establishes a more objective standard for foot penetration. | Emphasizes defined safety boundaries. |
| Video Challengeable | No. | Yes, under the 2026 rule change. | No. |
USA Volleyball Rule Casebook
Read the following scenarios and determine whether the play is legal or illegal using USAV rules. The rulings are provided after each scenario.
S2 jumps to block and kicks R4 in the leg, knocking R4 off balance. The ball falls to the court near R4. In the judgment of the first referee, R4 could have made a play on the ball if the contact with S2 had not occurred.
Ruling: Penetration fault on S2. Even though the contact was accidental, S2’s penetration into the opponent’s space below the net interfered with R4’s ability to make a play.
S4 jumps to block and kicks R3’s leg, knocking R3 off balance. R3 then contacts the bottom of the net. The ball continues to Team S’s playing area.
Ruling: Play continues. R3 has not committed a net fault because R3 was not in the act of playing the ball. In addition, because the contact by S4 was not intentional and did not prevent R3 from playing the ball, there is no interference.
After diving to set the ball, R3 slides across the center line and into Team S’s court. Both feet remain on Team R’s side of the net. S2 attempts to move into position to block the ensuing attack but must take an indirect path to avoid contacting R3.
Ruling: Penetration fault on R3. Although R3 is in an otherwise legal position, R3 interfered with S2’s play. In addition, R3’s proximity to S2 created a safety hazard.
R3 jumps to block, then lands on the floor with both heels on the center line and the remainder of the feet on the opponent’s court. The blocked ball then falls on Team S’s side of the net and contacts R3’s foot.
Ruling: Legal play. Point and service to Team R. The foot position was legal. Treat the ball contacting the foot the same as if it had contacted the floor.
After blocking, R3 turns to see the next play by a teammate. In doing so, R3’s foot completely crosses the center line and touches the opponent’s court.
Ruling: No fault by R3, provided there was no interference with the opponent’s play and the encroachment did not present a safety hazard.
S6 drops to a knee to save a ball near the net. S6’s knee and one hand touch Team R’s court. Both of S6’s feet remain on Team S’s court.
Ruling: Legal play. Touching the opponent’s court with the knee is permitted because there is no interference or safety hazard.
S2 falls to the floor and rolls under the net across the center line. Both of the player’s feet are in the air above and completely over Team R’s court, but both hands are contacting Team S’s court. R4 quickly moves away from S2 to avoid being kicked. R6, who is far from S2, plays the ball.
Ruling: Penetration fault by S2. Although there was no interference with R4’s play, the encroachment presented a safety hazard.
Player R44 moves toward the net to set a tight pass. As she completes her setting action, her entire foot completely crosses the center line and touches the opponent’s court. No opponent is in the vicinity of the encroaching foot, so there is no interference and no safety hazard. The referees allow play to continue.
Ruling: The referees are correct. Since there was no interference and no safety hazard, encroachment into the opponent’s court, even with the entire foot, is legal. However, if the setter had interfered with the opponent’s play or the encroaching foot had created a safety hazard, play would be stopped and a penetration fault would be called on R44.
References
1. USA Volleyball (USAV)
Source: USA Volleyball. (2026). 2025–2027 Domestic Competition Regulations, Rule 11.2: Penetration Under the Net.
Rule Provision: USAV Rules 11.2.1 and 11.2.2 state that it is permissible to penetrate into the opponent’s space under the net provided there is no interference with play. Encroachment of the foot or feet into the opponent’s court is legal if some part of the penetrating foot remains in contact with or directly above the center line. Encroachment with any body part above the foot is legal provided it does not cause a safety hazard or interfere with play.
2. National Collegiate Athletic Association (NCAA)
Source: National Collegiate Athletic Association. (2026, February 19). Changes to center-line faults approved in women’s volleyball. NCAA Media Center.
Rule Provision: For the 2026 women’s volleyball season, the Playing Rules Oversight Panel instituted a zero-tolerance boundary update. Any instance in which a player’s foot completely crosses the 5-centimeter center line constitutes an immediate fault. The standard removes referee subjectivity regarding safety hazards or interference. Center-line faults are also challengeable under the video review system.
3. National Federation of State High School Associations (NFHS)
Source: National Federation of State High School Associations. (2026, April 22). NFHS Volleyball Weekly Rule Interpretations: Net Play & Center Line Faults. Rules 9-5-7 and 9-6-7d(1).
Rule Provision: NFHS Rule 9-5-7 permits players to touch the floor across the center line with one or both feet, provided that a portion of the foot or feet remains on or directly above the center line. Complete encroachment over the center-line plane with any body part, including the hands, arms, or torso, constitutes a fault if it compromises the safety of an opponent making a legitimate effort to play the ball.
This article was written by Joseph O’Neal, Head Official for JVA. To reach Joseph email officials@jvavolleyball.org
