Am I correct in saying....
- Thread starter Electron1
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30mA is 0.03A
and yes, IR of 7666 ohms would trip a 30mA RCD. or a L-E loop of 7666.
however, to calc max Zs including touch voltage, calculation uses 50v, not 230v
and yes, IR of 7666 ohms would trip a 30mA RCD. or a L-E loop of 7666.
however, to calc max Zs including touch voltage, calculation uses 50v, not 230v
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max touch voltage during fault is 50v.
Ze + R1R2 is Zs
but to calculate Zs for an RCD with touch voltage of 50, you use 50 / RCD rating
Ze + R1R2 is Zs
but to calculate Zs for an RCD with touch voltage of 50, you use 50 / RCD rating
No; he means in order to limit the voltage on exposed metalwork rising above the touch voltage limit, which is generally 50V, but can be 25V under certain conditions.
do they still teach the 50v rule anymore?
Yes but it skimmed over like the TT system is, nothing of great depth.
AndyGuinness
AndyGuinness
Doesn't look like it
perhaps ^ would be a better question, mate??
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