Rule 3 – Section 2 – Article 4 Rule 3-2-4-b – Timing Devices

b. 40-Second Clock.

1. When an official signals that the ball is dead, the play clock shall begin a 40-second count.
2. If the 40-second clock does not start or the count is interrupted for reasons beyond the control of the officials or the play-clock operator (e.g. clock malfunction), the referee shall stop the game clock and signal (both palms open in an over-the-head pumping motion) that the play clock should be reset at 40 seconds and started immediately.
3. In the event that the 40-second clock is running and reads 20 before the ball is ready to be snapped, the referee shall signal that the play clock be set at 25 seconds. If there is a delay in doing this, the referee shall declare a timeout and signal that the play clock be set at 25 seconds. When play is to be resumed, the referee will give the ready-for-play signal [S1] and the play clock shall begin the 25-second count. The game clock will start on the snap unless it had been running when the referee declared a timeout; in that case, it will start on the referee’s signal (Rule 3-3-2-f). (A.R.
   3-2-4:I and II)