DS215TCCBG3AZZ01A
Uo是标称交流或直流线对地电压。综上所述，很明显，由于上述关系中分母处的电流量不同，使用灵敏度不同的剩余电流断路器，接地布置的电阻RA值会有所不同。事实上，通过使用灵敏度为30mA的剩余电流装置，接地电阻值低于表1：就断开时间而言，终电路的大断开时间不超过32A，本标准区分了两种可能性；•额定电流不超过32A的终电路：在这种情况下，必须在表1所示的时间内满足上述条件（故障电流值明显高于剩余电流断路器的额定剩余电流，通常为5·I∆n）履行；•额定电流超过32A的配电电路或终电路：在这种情况下，必须在不超过1s（常规时间）的时间内满足上述条件。在TT系统中，如果通过过电流保护装置实现断开，并且保护等电位连接与装置内的所有外部导电部件相连，则可使用适用于TN系统的大断开时间。注1：除电击保护外，可能需要断开连接。注2：如果RCD符合上述要求，则根据上表，断开时间与预期剩余电流相关，显著高于RCD的额定剩余工作电流（通常为5·I∆n）。RA公司≤ 50=1666.6W 0.03 RA≤ 50=166.6W 0.3，而对于灵敏度较低的剩余电流装置（例如300mA灵敏度），接地电阻值低于：

Uo is the nominal a.c. or d.c. line to earth voltage. From the above, it is evident that the value of the resistance RA of the earthing arrangement results to be different by using residual current circuit-breakers with different sensitivity, since the current quantity at the denominator in the above mentioned relationship is different. In fact, by using a residual current device with 30mA sensitivity, an earthing resistance value lower than Table 1: Maximum disconnection times for final circuits not exceeding 32A As regards the disconnection times, the Standard distinguishes two possibilities; • final circuits with rated currents not exceeding 32A: in this case it is necessary that the above mentioned condition with the times shown in Table 1 (values referred to fault currents significantly higher than the rated residual current of the residual current circuit-breakers typically 5·I∆n ) is fulfilled; • distribution circuit or final circuit with rated currents exceeding 32A: in this case it is necessary that the above mentioned condition is fulfilled with a time not exceeding 1 s (conventional time). Where in TT systems the disconnection is achivied by an overcurrent protective device and the protective equipotential bonding is connected with all extraneous-conductive-parts within the installation, the maximum disconnection times applicable to TN systems may be used. NOTE 1 Disconnection may be required for reasons other than protection against electric shock. NOTE 2 Where compliance with the above mentioned requirement is provided by an RCD, the disconnecting times in accordance with the table above relate to prospective residual currents significantly higher than the rated residual operating current of the RCD (typically 5·I∆n ). RA ≤ 50 = 1666.6W 0.03 RA ≤ 50 = 166.6W 0.3 shall be obtained, whereas with a less sensitive residual current device (for example with 300mA sensitivity) an earthing resistance value lower than: