IS 13109 : Part 3 : 1999 Specification for Electronic Equipment/Systems for Use in Coal and Metalliferous Mines - Part 3 : Requirements for Battery Powered Amplifier Telephone Systems

1 Scope

This standard (Part 3) covers requirements for battery poweredamplifier telephone systems for use in coal and metalliferousmines.

2 Reference

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