Help me work out volt drop please....

[Gringoking88]

Hi all,

I am currently doing my 2391-52 and have been given a mock paper, one of the questions is around vold drop as per below, can someone please help me understand how to get the answer as I just cant seem to work it out!

Thank you advance!

Voltage drop of a single-phase distribution circuit supplying a power distribution board in a remote building is to be verified as part of the periodic inspection and testing within a workshop complex. The installation forms part of a public 400/230 V TN-S system.
The circuit has a measured R1+Rn value of 0.15 Ω and an Ib of 60 A. The circuit protective device has an In of 80 A, see Figure 5.
What is the maximum acceptable voltage drop for this distribution circuit if the highest circuit voltage drop on DB-3B is 5.0 V?

a) 11.5 V
b) 6.9 V
c) 6.5 V
d) 1.5 V

 

[Mike Johnson]

Many years ago I set the questions for the Fellowship entrance to one of my Institutes, it was always the older, supposedly more intelligent candidates that failed and always for the same reason, not reading the question correctly, ergo if you fail you are more intelligent. ?

 

[telectrix]

Many years ago I set the questions for the Fellowship entrance to one of my Institutes, it was always the older, supposedly more intelligent candidates that failed and always for the same reason, not reading the question correctly, ergo if you are old you are more intelligent. ?

corrected for you.

 

[Mike Johnson]

The problem is that I have so much information stored in my Brain that some of it has to leave to allow new information to come in, that's my excuse for being forgetful and I am sticking to it.

 

[Zerax]

I was taught to RTFQ

 

[ruston]

I was taught to RTFQ

Our teacher was polite. RTBQ.

 

[telectrix]

our teacher was illiterate illigitimate.