2391 December 2011

[smokey]

Just sat exam feeling really confident couldn't of asked for a better paper everything clicked into place finished with an hour to go let's hope all my hard work as paid off only 40 days to wait try and enjoy Xmas now and forget about it

 

[SLIPSHOD & SLAPDASH]

Not sure if thats good or bad having an hour spare. I was still checking mine when the time up came ( a while back now). Oh and welcome

 

[fulham sparks]

Fire alar went off when I was taking mine! Do u think the will take that into consideration?

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Also what did you put for the question about how you would decrease the voltage drop?

 

[Sidewinder]

Increase CSA?

 

[batty]

Wow an hour to spare all the exams i have done don't think i have ever had any spare time but i am really not a swat.

 

[vinney]

I was hard pushed to complete all questions in the full 2 1/2 hours.

What did you put for the Test Current for the 300mA RCD and the expected result?

Not sure why but question about volt drop had me stumped for a while as i was thinking you needed the length to calculate - Got there in the end but used 3% instead of 5% for the volt drop.!!!!! Hope i get some marks for my working out.

 

[Pfjt]

Hi guys what answer did people get for 1 and 4 , also on the volt drop question should I have halfed the combined resistance of the line and neutral .

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Oh and the test current was 300ma

 

[DarkInferno]

For 1, my answer was:

The wiring system and attached electrical equipment and accessories should be:

To British Standards.

Safe - Free from damage.

Correctly Selected and Erected.

 

[leonard]

Vd=(R1+Rn)xIb=11.4V

300mA and operate in 300mS

 

[Sidewinder]

No the test current for a 300mA RCD is x1/2 = 150mA & x1 = 300mA.

The tripping time is 200ms if it is BS, 300ms if it is BSEN.

 

[Manator]

I did mine in 17 minutes and scored 97%, but thats because I never had a calculator with me. I was so shocked that I answered some questions wrong, or was it just one part of a question?

 

[Sidewinder]

Manator,

I know you are a super being as you are a Mod & all that.

However, I suspect that you are getting course numbers mixed up!

2391-10 is the PIR exam, 3 hrs written.

I don't think I could write the answers to this down in 17 minutes if I had them to copy out!

 

[Manator]

You are probably right, it may have been another exam that I was rushing through. Problem is that I have an almost photographic memory for anything that interests me, and easily pass exams, but the real test comes when you have to apply this in the real world. My mentor was an old chap who thought having an apprentice was a chore, once he accepted me he taught me more than I would ever learn from books.

 

[steptoe]

I did mine in 17 minutes and scored 97%, but thats because I never had a calculator with me. I was so shocked that I answered some questions wrong, or was it just one part of a question?

of course you did,

there there,

not sit down here while KME gets you one of his special beers just for you,

 

[SLIPSHOD & SLAPDASH]

I did mine in 17 minutes and scored 97%, but thats because I never had a calculator with me. I was so shocked that I answered some questions wrong, or was it just one part of a question?

Did you live in a shoebox, by any chance ?

And was it in the middle of the road ?

 

[Manator]

I feel a monty python sketch approaching

 

[leonard]

that's what i m saying test current 300mA and op at 300 mS ,it was a bs en type rcd.

 

[Sidewinder]

leonard,

There are 2 test currents at least for any RCD, x1/2 & x1 of I delta n