Wiring exam question.

[adiewadie247]

Thanks. I never asked anyone to do the original question for me. Some people gave me some pointers and I have discussions with others. I think that this question is as answered as it is going to get.

 

[Callum Jackson]

Can someone give me some table or page references for this please (osg or wiring regs i have both books). Like for each section i have some already but would like to double check with what everyone else has.

Got my 302 retake in the morning so this is urgent dropped marks on a question like this last time could use some help.

Thanks

 

[mickys86]

Will do when I get back in. Currently walking round the coast

 

[mickys86]

I can pretty much guarantee you that this will be the question you will get. My tutor told us we will get this question and we did.
A 230v 6kw load is supplied via a bs1361 fuse using single core 70*c thermo plastic PVC cables in conduit over a distance of 20 metres. The ambient temperature is 35*c.

Determine:
1 design current
2 minimum fuse rating
3 correction factor value
4 minimum cable rating
5 minimum cable size
6 cable volt drop

1 design current - work out the Amps that the circuit
Will draw.... P/V 6000/230 = 26.1
2 we could use a 30a bs1361 fuse (it says bs1361 in the question)
3 read page 123 - 30/0.94 = 31.91
4 read page 128
5 as above
6 read page 133 and 124

Good luck in ya exam

Ps I only have the red OSG on me so that's the book I refer too

 

[Callum Jackson]

Well that will teach me to read more carefully i have just spend a solid 5 minutes looking in my green OSG ¬_¬

 

[mickys86]

Haha. It will definitely be in there. Look under current carrying capacities and voltage drop for copper conductors

 

[Paul.M]

Micky that is a great answer without giving the answer away, that's why I've given you a thanks.

Too many people come on here and want us to do their homework. You've pushed him in the right direction and the OP has now looked in his books for the formula, not the answer. He will learn more.

Hat off to you both.

 

[Callum Jackson]

Thanks for the help guys.

I passed my 302 retake today with a credit!

(last time i failed with 38% a low point by far!)

Although just my luck this question didn't come up in the exam. However it was really helpful!

Thanks again.

 

[adiewadie247]

Well done Callum.

 

[mickys86]

Congratulations mate! What exam is up next?

 

[brucelee]

i have a 302 exam should have been tomoz but been delayed until next week
anyway this is a question we have also been doing as well as many others
congrats micky on explaining it but not giving everything away

then its the 303 written on fault finding so if anyone has any 302 and 303 exam type questions expecially upto date ones would be appreciated
pm me and i will pass my email addy cheers