Calculate / look up the maximum permitted Zs values ( earth loop impedance ) as per BS 7671 2018. Also includes 80% temperature adjusted values and a some MCCB 60947-2 Zs charts.
> Common BS EN Devices:
Scroll through the list of protective devices and select the device rating to calculate the maximum permitted Zs value for your selected device.
> Manufacture 60947-2 MCCB's:
Now includes many manufacture Zs charts for 60947-2 MCCB's.
+ BS 7671 18th Edition 2018
+ BS EN protective devices
+ RCD's in TT earthing systems
+ Max REC Ze values
+ Ze + R1+R2 = Zs calculator
+ 100% values
+ 80% values
+ 0.4 second disconnection times
+ 0.2 second disconnection times
+ 5 second disconnection times
+ Uo 55v (U 110v)single phase and Uo 63.5v (three
phase) Zs values
+ BS EN 60947-2 MCCB manufacture device charts
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