In certain unfavourable circumstances, sudden transient voltages of exceptionally high instantaneous amplitude, of the order of 1 kV for example, may occur across a telephone set which is normally connected to a
metal wire line, as a result of electromag
ITU-T K.8-1988 history
1988ITU-T K.8-1988 SEPARATION IN THE SOIL BETWEEN TELECOMMUNICATION CABLES AND EARTHING SYSTEM OF POWER FACILITIES