This international standard applies to plugs, fixed or portable socket outlets and appliance inlets hereinafter referred to as accessories, with a rated operating voltage not exceeding 1 000 V DC or 1000 V AC not exceeding 500 Hz and a rated current not exceeding 800 A, primarily intended for industrial use, either indoors or outdoors. These accessories are intended to be installed by instructed persons (IEV 195-04-02) or skilled persons (IEV 195-04-01) only. The list of preferred ratings is not intended to exclude other ratings. This document applies to accessories for use when the ambient temperature is normally within the range of 25 °C to +40 °C. These accessories are intended to be connected to cables of copper or copper alloy only. This document applies to accessories with screwless type terminals or insulation piercing terminals, with a rated current up to and including 32 A for series I and 30 A for series II. The use of these accessories on building sites and for agricultural, commercial and domestic applications is not precluded. Fixed socket-outlets or appliance inlets incorporated in or fixed to electrical equipment are within the scope of this standard. This standard also applies to accessories intended to be used in extra-low voltage installations. This document does not apply to accessories primarily intended for domestic and similar general purposes. This document does not cover single-pole accessories. In locations where special conditions prevail, for example on board ship or where explosions are liable to occur, additional requirements may be necessary.