ISO 14990-3:2016规定了自供电（利用车载电源）电动土方机械（EMM）中电气设备及其部件的特殊安全要求。 适用于车载电压在50 V？范围内的机器？任何频率下36 kV AC r.m.s.和75 V？36千伏直流电？包括脉动直流电的重复频率吗？用于户外使用。 设备内发生的电压不被视为车载电压，因此不在其范围内。 它旨在与ISO 14990？1结合使用，ISO 14990？1给出了EMM的一般要求，无论它们是如何供电的。ISO 14990-2给出了外部驱动机器的具体要求。EMM既可以是自供电的，也可以是外部供电的（例如，电池供电的机器具有内置充电器和电源功能），在这种情况下，ISO 14990？2也适用。

ISO 14990-3:2016 specifies the particular safety requirements for the electrical equipment and its components incorporated in self-powered (utilizing on-board electric power sources) electrically-driven earth-moving machines (EMMs). It is applicable to those machines using on-board voltages in the range of 50 V?36 kV AC r.m.s. at any frequency, and 75 V?36 kV DC?including any repetition rate of pulsating DC?intended for outdoor use. Voltages occurring within devices are not considered to be on-board voltages and are thus not within its scope. It is intended to be used in conjunction with ISO 14990？1, which gives general requirements for EMMs regardless of how they are powered. Requirements specific to externally-powered machines are given in ISO 14990？2. It is possible to have an EMM that is both self-powered and externally powered (e.g. a battery powered machine having a built-in charger with power supply function), in which case ISO 14990？2 is also applicable.