This part of 60309 applies to plugs, socket-outlets, ship connectors and ship inlets, hereinafter referred to as accessories, intended to connect ships to dedicated shore supply systems described in IEC 80005-3. This part of IEC 60309 applies to accessories with three phases and Earth with four pilot contacts. NOTE 1 In the USA, the term "Ground" is used instead of "Earth". These accessories have a rated current of 350 A and rated operating voltage not exceeding 690 V 50/60 Hz. These accessories are intended to be installed and operated by instructed persons (IEC 60050- 195:1998, Amendment 1:2001, 195-04-02) or skilled persons (IEC 60050-195:1998, Amendment 1:2001, 195-04-01) only. This standard applies to accessories for primary use outdoors in a seawater environment when the ambient temperature is normally within the range of 25 °C to +40 °C. NOTE 2 In some countries, other ambient temperatures may prevail and may need to be taken into account. These accessories are intended to be connected to cables of copper or copper alloy only. Socket-outlets or ship inlets incorporated in or fixed to electrical equipment are within the scope of this standard. In locations where special conditions prevail, for example where explosions are liable to occur, additional requirements may be necessary.