If ∑I1 (not including I2 ) exceeds 3.5 mA: − the equipment shall have provision for a permanent connection to protective earth in addition to the PROTECTIVE EARTHING CONDUCTOR in the power supply cord of PLUGGABLE EQUIPMENT TYPE A orPLUGGABLE EQUIPMENT B; and − the installation instructions shall specify the provision of a permanent connection to protective earth with a cross-sectional area of not less than 2,5 mm2 , if mechanically protected, or otherwise 4,0 mm2 ; and − one of the following labels, or a label with similar wording, shall be affixed adjacent to the permanent earth connection. It is permitted to combine this label with the label in 5.1.7.1 b). WARNING HIGH LEAKAGE CURRENT EARTH CONNECTION ESSENTIAL BEFORE MAKING TELECOMMUNICATION NETWORK CONNECTIONS WARNING HIGH TOUCH CURRENT EARTH CONNECTION ESSENTIAL BEFORE MAKING TELECOMMUNICATION NETWORK CONNECTIONS