5.1.8.2 Summation of touch currents from telecommunication networksNOTE Annex W explains the background to 5.1.8.2. An EUT that provides TELECOMMUNICATION NETWORK connection ports for connection of multiple items of other telecommunication equipment, shall not create a hazard forUSERS and TELECOMMUNICATION NETWORK SERVICE PERSONS due to summation of TOUCH CURRENT. In these requirements, abbreviations have the following meanings: − I 1 is the TOUCH CURRENT received from other equipment via aTELECOMMUNICATION NETWORK at a telecommunication port of the EUT; − ∑ I 1 is the summation of TOUCH CURRENTS received from other equipment at all such telecommunication ports of the EUT; − I 2 is the TOUCH CURRENTdue to the AC MAINS SUPPLY of the EUT. It shall be assumed that each telecommunication port receives 0,25 mA (I 1 ) from the other equipment, unless the actual current from the other equipment is known to be lower. The following requirements, a) or b) as applicable, shall be met: a) EUT with earthed telecommunication ports For an EUT in which each telecommunication port is connected to the main protective earthing terminal of the EUT, the following items 1), 2) and 3) shall be considered: