IS 13109 : Part 5 : 1991 Specification for electronic equipment/systems for use in coal and metaliferrous mines:Part 5 Requirements for loud hailing telephone systems

1 Scope

1.1 This standard covers the requirements for loud hailingtelephone systems for use in coal and metalliferrous mines.

1.2 This standard shall be read in conjunction with IS 13109 :Part 1 : 1991.

2 Reference

IS 13109 : Part 1 :1991 Specification for electronicequipment/systemsfor use in coal and metalliferrous mines:Part 1 Definitions, general requirements andtests