Main contents of technical requirements for overvoltage and overcurrent protection of urban telephone communication systems: This standard refers to the international standards CCITT recommendations K.11 \"Principles for overvoltage and overcurrent protection\", K.20 \"Protection requirements for overvoltage and overcurrent of telecommunication switching equipment\" and K. 21 ((Overvoltage and overcurrent resistance of user terminals). This standard specifies the overvoltage and overcurrent protection performance requirements that urban telephone communication systems should have. This standard applies to urban telephone communication systems: switches, main distribution frames, urban telephone lines and user-end equipment for lightning protection and protection against dangerous influences of strong electricity. The overvoltage and overcurrent protection of small exchange systems also refers to this standard. It is not applicable to the prevention of interference, nor to the influence of ground potential generated by strong electricity.
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