There is no limit to touch voltage in IEC 60364-4-41 for TN systems (as today)


For TT systems, same disconnection times, but touch voltage limited to 50 V by equipotential bonding. This is not the same as today.


The disconnection times in Table 41 A (TN systems) are AC only but otherwise as they are for TN systems today, way back to 1992 at least, perhaps before ... As below for the 1999 Ed for example:


U0        Disconnection time (s)

120           0.8

230           0.4

277           0.4

400           0.2

>400         0.1

There is no limit to touch voltage in IEC 60364-4-41 for TN systems (as today)


For TT systems, same disconnection times, but touch voltage limited to 50 V by equipotential bonding. This is not the same as today.


The disconnection times in Table 41 A (TN systems) are AC only but otherwise as they are for TN systems today, way back to 1992 at least, perhaps before ... As below for the 1999 Ed for example:


U0        Disconnection time (s)

120           0.8

230           0.4

277           0.4

400           0.2

>400         0.1