Discuss Max Zs measurement allowed in the UK Electrical Forum area at ElectriciansForums.net
Yea still trying to find them… will have to calculate using the BS time curve tablesAccording to this table they don't exist!
However, interpolating/scaling between 10A and 15A Type 3 breakers to 13A results in 1.42 ohms.
If they are usual type C (instant trip point = 5-10 * In) then you can calculate Zs for cold testing (assuming ~70C operating, etc) as:The breakers shown in the (blurry) picture seem to be these - ABB 60898 S271 type C, not BS3871 type 3.
There are datasheets for these that include the time/current charts.
I don't know if this helps at all...
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