Hi - Just joined the forum as I'm making a career change and am training up.
I've come across some mock papers online and am concerned that either I'm way off or they're wrong, so would love some input. (Exams here)
Given that the resistance per metre of 2.5mm² cable is 7.41mΩ/m at 20°C , what would the approximate R1+R2 reading be at the at the extreme end of a 25m long 20A radial socket outlet circuit?
Possibile answers are
I came out with 0.37 using BS7671 and GN3 but the exam confirmed .17 as the answer. Could anyone take a look and tell me what I'm missing/where to find the missing info in either book? Thanks!
I've come across some mock papers online and am concerned that either I'm way off or they're wrong, so would love some input. (Exams here)
Given that the resistance per metre of 2.5mm² cable is 7.41mΩ/m at 20°C , what would the approximate R1+R2 reading be at the at the extreme end of a 25m long 20A radial socket outlet circuit?
Possibile answers are
- 0.27
- 0.37
- .074
- 0.17
I came out with 0.37 using BS7671 and GN3 but the exam confirmed .17 as the answer. Could anyone take a look and tell me what I'm missing/where to find the missing info in either book? Thanks!