FIVB Official Volleyball Rules

15.10.4 If a team intends to make simultaneously more than one substitution,
all substitute players must enter the substitution zone at the same time
to be considered in the same request. In this case, substitutions must
be made in succession, one pair of players after another. If one is illegal,
the legal one(s) is/are granted and the illegal is rejected and subject to
a delay sanction.
15.11 IMPROPER REQUESTS
15.11.1 It is improper to request any regular game interruption: 15
15.11.1.1 during a rally or at the moment of or after the whistle to serve, 12.3
1.4.3, 15.2.2
15.11.1.2 by a non-authorized team member, 5.1.2.3, 5.2.3.3
15.11.1.3 for a second substitution by the same team during the same
interruption, except in the case of injury/illness of a player in play.
15.11.1.4 after having exhausted the authorized number of time-outs and
substitutions.
15.11.2 The first improper request by a team in the match that does not affect
or delay the game shall be rejected, but it must be recorded on the
score sheet without any other consequences.
15.11.3 Any further improper request in the match by the same team constitutes
a delay.
16 GAME DELAYS
16.1 TYPES OF DELAYS
An improper action of a team that defers resumption of the game is a
delay and includes, among others:
15.2.2, 15.2.3,
16.1, 25.2.2.6
15.1
16.1, 25.2.2.6
16.1.4
16.1.1 delaying regular game interruptions; 15.10.2
16.1.2 prolonging interruptions, after having been instructed to resume the
game;
16.1.3 requesting an illegal substitution; 15.9
16.1.4 repeating an improper request; 15.11.3
16.1.5 delaying the game by a team member.
15
1.4.3
15.2.2
15
12. 3
5.1.2.3, 5.2.3.3
15.2.2,15.2.3
16.1,25.2.2.6
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38
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