Bear
-
- Reaction score
- 30
Morning all,
Am studying for my multiple choice questions next month, and my brain does not seem to get these type of questions? Want to now if am doing it right and understanding the theory correctly. The question below and then the way i got my answer.
A radial socket outlet circuit is supplied by 2.5mm2 cable and is 20m long. Given that the Ze of the installation is 0.43Ω and that the resistivity of the cable is 7.41mΩ/m at 20°C, what is the calculated Zs?
Answers
A. 0.9Ω B. 0.6Ω C. 0.58Ω D. 1.2Ω
So how i worked it out. Zs=Ze+(R1+R2) Zs= 0.43+(7.41x20/1000) =0.5782
Now i rounded it off to 0.58Ω and the answer was right, But should i be rounding off? was the calculation correct? and what if i dont know the length of the cable?
Any help is appreciated guys and girls, am pulling my hair out lol
Am studying for my multiple choice questions next month, and my brain does not seem to get these type of questions? Want to now if am doing it right and understanding the theory correctly. The question below and then the way i got my answer.
A radial socket outlet circuit is supplied by 2.5mm2 cable and is 20m long. Given that the Ze of the installation is 0.43Ω and that the resistivity of the cable is 7.41mΩ/m at 20°C, what is the calculated Zs?
Answers
A. 0.9Ω B. 0.6Ω C. 0.58Ω D. 1.2Ω
So how i worked it out. Zs=Ze+(R1+R2) Zs= 0.43+(7.41x20/1000) =0.5782
Now i rounded it off to 0.58Ω and the answer was right, But should i be rounding off? was the calculation correct? and what if i dont know the length of the cable?
Any help is appreciated guys and girls, am pulling my hair out lol
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