This Recommendation contains the information needed to protect telecommunications equipment installed in customer premises from damage due to lightning strikes to the power and telecommunications lines/cables. It shows that it is possible to protect equipment against a direct strike to the incoming service (power or telecommunications) providing that the strike point is more than a couple of hundred metres from the customer premises in an urban area. The information provided takes into consideration the impact of the different types of power distribution systems. It determines the impact of both the length of the telecommunication Surge Protection Device (SPD) bonding conductor and the resistance to earth at the customer's premise. It also calculates the necessary isolation level for the protection of equipment without the use of primary protection. It recommends the installation of a Multiservice Surge Protective Device (MSPD) or equivalent protection as the first level of protection. When necessary, primary protection is required to protect the MSPD or equivalent protection. For strikes to the services closer to the customer premises an engineering solution is required.