- Thread starter cliffed
- Start date
- Jul 15, 2016
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- If you're a qualified, trainee, or retired electrician - Which country is it that your work will be / is / was aimed at?
- United Kingdom
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- Electrical Engineer (Qualified)
N
nicebutdim
Good to see @westward10 being educated about protective devices 
According to this table they don't exist!
However, interpolating/scaling between 10A and 15A Type 3 breakers to 13A results in 1.42 ohms.
https://www.----------------------------/media/1627/master_earthfaultlooptable.pdf
However, interpolating/scaling between 10A and 15A Type 3 breakers to 13A results in 1.42 ohms.
- Jul 15, 2016
- 23,300
- 1
- 29,151
- 315,788
- If you're a qualified, trainee, or retired electrician - Which country is it that your work will be / is / was aimed at?
- United Kingdom
- What type of forum member are you?
- Electrical Engineer (Qualified)
They do exist but are an oddity, Memshield 2 had 13A devices but are rare as hens teeth.
Yea still trying to find them… will have to calculate using the BS time curve tables
L
loz2754
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...
There are datasheets for these that include the time/current charts.
I don't know if this helps at all...
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:
Zs = 80% * Umin / Imax = 0.8 * (230 * 0.95) / (13 * 10) = 1.34 ohms
Thanks guys think someone got the details wrong….. happy now
D
davesparks
I've never seen the MEM ones but I see a few different brands of 13A MCB used in various stage lighting dimmers.
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