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Table 41.1 Assumed Touch Voltage
Former Community Member
I am a bit confused by this. Why do the disconnection times in Table 41.1 appear to be based on a touch voltage of 100 volts rather than a touch voltage of 125 volts?
For example, 110% of 230= 253 volts. Assuming L and PE are of the same size and material, indirect contact touch voltage is 126.5 volts. Would 0.33 seconds not appear more realistic?
My understanding is that RCDs were not required on TN supplies until the late 90s.
RCDs for supplementary protection have been gradually required for more and more situations over time. For sockets supplying equipment outdoors the 30mA RCD requirement goes back at least to the 15th Ed - so from about 1981.
- Andy.
Ah, thank you for clearing this up :)
What was the IETs reasoning for outdoor sockets originally, if you know?
My understanding is that RCDs were not required on TN supplies until the late 90s.
RCDs for supplementary protection have been gradually required for more and more situations over time. For sockets supplying equipment outdoors the 30mA RCD requirement goes back at least to the 15th Ed - so from about 1981.
- Andy.
Ah, thank you for clearing this up :)
What was the IETs reasoning for outdoor sockets originally, if you know?
