hello all i got a question on a testing question

[Johnuk]

am looking at the question and am a bet lost now on answering it.....



The maximum permissible values of earth fault loop impedance for three circuits are 1.44 Ω, 0.92 Ω and 7.67 Ω. If the measured values for these circuits are 1.25 Ω, 0.68 Ω and 6.22 Ω, determine if the measured values are acceptable. Show calculations

 

[ezzzekiel]

using rule of thumb the max value allowed is 80% of the given max so?

 

[malcolmsanford]

To start you of would be as follows

1.44*0.8 = 1.15 so first circuit is a fail

 

[Johnuk]

thanks i did put it as a answer just double checking THANKS ezzzikiel

 

[ezzzekiel]

no problem, prefer to give you the idea and let you do the workings yourself as opposed to just being given the answers.