17th edition help please

[ursheeee]

hello evryone

i was just wondering if anyone could help answer 2 questions for me

1, how many questions need to be correct in the 17th edition update (30 question) exam

and

2, I am struggling to find the answer to this question in the regs

the maximum measured value for BS EN 60898 16A B type circuit breaker is
a) 2.3 ohms
b)2.87 ohms
c)1.44 ohms
d)2.19 ohms

i have been finding it as b - 2.87 but i have been told the answer is actuallly a - 2.3 but i cannot seem to find this number anywhere in the book. Im i just daft/blind/stupid ???

any help would be sooo much appreciated

 

[Spudnik]

2.3 is the corrected value.

I think.

 

[acat]

Probably a typing error your answer is correct 2.87 page 49 BRB table 41.3
18 out of 30


Chris

 

[Guest123]

BS 7671 value will be 2.87ohms.

On Site Guide value will be the temperature corrected value of 2.87 - 20% = 2.3ohms.

Go with the BS 7671 value.

 

[ursheeee]

ahhaaa yes i see now. this must be where the multiplication of 80% comes into play.

thankyou peeps

 

[acat]

As per Lennys post as well it becomes 2.296 if you multiply by .8


Chris

 

[bugsy]

I agree with lenny 2.87 b 1.44 c 0.72 d

 

[saveloy]

Correct me if I am wrong but they are asking for the max measured value (with test meter) which would be 2.3 ohms
ie. 80% of 2.87 to allow for rise in conductor temp under real fault conditions

 

[Guest123]

Correct me if I am wrong but they are asking for the max measured value (with test meter) which would be 2.3 ohms
ie. 80% of 2.87 to allow for rise in conductor temp under real fault conditions

Think you may be right....Note to Self, must read posts more carefully in future.


City and Guilds love wording questions like this to try and catch you out. Rotters!!!!

 

[acat]

Hmmmmmmmmm I think I will follow your lead Lenny and read the post properly



Chris

 

[saveloy]

Think you may be right....Note to Self, must read posts more carefully in future.


City and Guilds love wording questions like this to try and catch you out. Rotters!!!!

Cheers Lenny.

Ursheee, Lenny is right about C&G's wording of questions. Read them carefully. They love to catch you out.

 

[garyinderby]

silly question? but why only 30 questions for 17th?

my C&G 2382 17th edit. was 60 questions? bit confussed

 

[acat]

If you have never taken the exam before you get 60 questions if you have the 16th edition you get only 30 questions to upgrade.


Chris