loop impedance, temperature, cable factor....

[westward10]

I suspect the answer lays with what he has been taught in the classroom but I would say that by being given Ze it should be deducted or maybe a red herring.

 

[Ian1981]

They must just want the R1+R2 value applied to the correction factor otherwise what's the point in stating the Ze value?

 

[NDG Elecs]

Yeah I thought because they have the Ze it was there for a reason. The question should have maybe stated that there were no possible parallel earth paths on the cct so you could accurately make an assumption as to the r1r2.

I forgot all about the tricky wording they use at C&G. Shame it's multiple choice, otherwise you could write both possible answers and the reasoning behind them.

 

[sozib2024]

It's 0.43 x 1.2 = 0.516+ 0.4= 0.916 D

where get R1+R2 value

 

[cireland]

Can I ask where the 1.2 multiplication factor comes from?
If you are using it to go from 80% to 100% it should be 1.25, is it not?

 

[PS Electrics]

Can I ask where the 1.2 multiplication factor comes from?
If you are using it to go from 80% to 100% it should be 1.25, is it not?

Change in resistance is 0.004 Ohms per degree

so 50 x 0.004 = 0.2 a 0.2 increase so correction factor is 1.2

 

[cireland]

Change in resistance is 0.004 Ohms per degree

so 50 x 0.004 = 0.2 a 0.2 increase so correction factor is 1.2

Did not know that!!
Cheers.