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A telephone or other two-way communications system connected to an approved constantly attended station shall be provided at not less than every fifth floor in each stairway where the doors to the stairway are locked.

Related Code Sections

24.3.7.2 Emergency Communications Systems (ECS),
) emergency communications systems (see Section 24.10) Stairway communications systems (see Section 24.10) Elevator landing communications systems (see ...