ITU_KINTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU K.20 (02/2000) SERIES K: PROTECTION AGAINST INTERFERENCE Resistibility of telecommunication equipment installed in a telecommunications centre to overvoltages and overcurrents ITU-T Recommendation K.20 (Formerly CCITT Recommendation) ITU-T RECOMMENDATION K.20 RESISTIBILITY OF TELECOMMUNICATION EQUIPMENT INSTALLED IN A TELECOMMUNICATIONS CENTRE TO OVERVOLTAGES AND OVERCURRENTS Summary This Recommendation specifies resistibility requirements and test procedures for telecommunication equipment which is installed in a Telecommunication Centre. Overvoltages or overcurrents covered by this Recommendation include surges due to lightning on or near the line plant, short-term induction of alternatin……