Rule 11. Signal and Timing Devices
(a)
Each rink must be provided with a siren, or other suitable sound device, for the use of Timekeepers.
(b)
Each rink shall be provided with some form of electrical clock for the purpose of keeping the spectators, players and game officials accurately informed as to all time elements at all stages of the game including the time remaining to be played in any period and the time remaining to be served by at least five penalized players on each team.
Time recording for both game time and penalty time shall show time remaining to be played or served.
The game time clock shall measure the time remaining in tenths of a second during the last minutes of each period.
(c)
Behind each goal, electrical lights shall be set up for the use of the Goal Judges. A red light will signify the scoring of a goal and a green light will signify the end of a period or a game.
NOTE:
A goal cannot be scored when a green light is showing.
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Jason Poirrier
, 1997.
Some images and official rule excerpts have been used from
nhl.com
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