This document specifies the interoperability requirements for the tractor/trailer and/or transport tank/trailer plug/socket, being: the connection used for the supply Type A and supply Type S electrical power to service equipment in hazardous areas; and the supply characteristics for each operating mode. This plug/socket combination includes provisions for future connections including data transfer. Service equipment connected to a supply Type A and/or a permanent power supply shall meet the requirements for electrical apparatus of the relevant group and temperature class according to the substances carried, which, for the substances defined in the foreword, shall be explosion group IIA and temperature class T4. Service equipment unsuitable for operation within such a hazardous area shall only be powered from a supply Type S power supply. This document is not applicable to: permanent power supplies; and/or the tachograph.