An Awful Feeling This

[gap30]

Don't get the PSCC & PEFC mixed up.

The PEFC is what you are after so you do not multiply by x 2 or 1.73 as it is a single phase calculation between a phase and earth.

230/03 = 766A

So your PEFC is 766 Amps

I hope this makes sense.

cheers pal makes a lot of sense, as i said earlier your pssc would always be higher so in my eyes its a silly question anyway

 

[brucelee]

yep always on 3 phase for single you have to measure both

 

[brucelee]

Gap30 empty your inbox for PMs mate its full

 

[gap30]

Gap30 empty your inbox for PMs mate its full

done pal

 

[gap30]

exam in two days! sheeting myself

bit of a silly one this

state two reasons for the prescribed sequence of tests prior to energising a new circuit

 

[IQ Electrical]

exam in two days! sheeting myself

bit of a silly one this

state two reasons for the prescribed sequence of tests prior to energising a new circuit

The sequence of tests is designed so that:

1 Safety is foremost-all dead tests are first and continuity of CPC is confirmed.

2 The results/faults identified in the previous test can influence the next so the sequence is designed to minimise this.

 

[gap30]

The sequence of tests is designed so that:

1 Safety is foremost-all dead tests are first and continuity of CPC is confirmed.

2 The results/faults identified in the previous test can influence the next so the sequence is designed to minimise this.

is there any reference to this in the books?

another one - state what the designer may take into account when determining maximum demand?

is this the type and use of the installation

 

[IQ Electrical]

is there any reference to this in the books?

another one - state what the designer may take into account when determining maximum demand?

is this the type and use of the installation

Diversity

 

[gap30]

a bs 1361 fuse is to be used to provide overcurrent and fault protection for a new circuit. State the effect on the operation of the fuse when the following conditions occur if the fuse was installed in the neutral conductor

a. overload fault
b. earth fault
c. short circuit fault

a. fuse would blow
b. no effect
c. fuse would blow

 

[gap30]

have i got this right, i know this has already been discussed somewhere but wanted to try it off the top of my head

sorry to be a pain in the butt

during the course of the inspection one of the single phase radial circuits supplying an item of fixed electrical equipment is to be checked for voltage drop compliance. The circuit has the following characteristics
load current = 45 amp
circuit length = 80 metres
live conductors = 10mm
a. using the information given in figure 1 determine whether the circuit meets the requirements for voltage drop. Show all calculations

80 x 1.83 x 2 x 1.2/1000 = 0.35136

v = ixr

vd = 45 x 0.35136 = 15.8 volts

230v circuit 5% = 11.5 volts

so circuit does not comply

is this correct?

 

[tony mc]

Your answer is right it does not comply.

I would have used the equation (mV/A/m)x Ib xL /1000 4.4 X 45 X 80 /1000 = 15.84 V

I see you have used (m ohms/m) x 2 x1.2 which gives you the the mV/A/m anyway.

On the question paper it will give you a table of mV/A/m for the different sizes of cables they won't expect you to remember them its the equation that you need to remember.

Good luck with the exam!!!

 

[tony mc]

And the volt drops percentages

 

[JUD]

have i got this right, i know this has already been discussed somewhere but wanted to try it off the top of my head

sorry to be a pain in the butt

during the course of the inspection one of the single phase radial circuits supplying an item of fixed electrical equipment is to be checked for voltage drop compliance. The circuit has the following characteristics
load current = 45 amp
circuit length = 80 metres
live conductors = 10mm
a. using the information given in figure 1 determine whether the circuit meets the requirements for voltage drop. Show all calculations

80 x 1.83 x 2 x 1.2/1000 = 0.35136

v = ixr

vd = 45 x 0.35136 = 15.8 volts

230v circuit 5% = 11.5 volts

so circuit does not comply

is this correct?

Yep
arty:

 

[gap30]

dont get too excited the next part of the question got me puzzled

State
i. a suitable observation to be recorded on the periodic report if the voltage drop fails to comply
ii. one action which could be taken to rectify the situation in i. above

i. circuit blah blah failed volt drop test code 2
ii. reduce length of circuit?

 

[maddfridge]

hi there

The simple answer is you are not speaking the city and guilds lingo mate and thats just it!

I have a C course qualification and i failed it first time !! 2391 that is

The simple fact then was you have a bank of questions which require a standard answer and if it aint standard you are not either !!

We just learnt parrot fashion questions and the way to answer them and at a speed which you need to get all the crap they want down
in the right time and manner.

i dont doubt you are a very good sparkie mate i would like to think i am as well as i have now got 2391 the old 2400 design and verification
qualifcation and that took its toll as well i can tell you.

get as many past paers and sit down and look for a repeat pattern over the years things may have changed new bits of regs but there are only certain areas of testing they can look at mate

the format used to 10 or 20 question short one hour and some lopnger one about two hour six i think


other on here will put me right about that so practice in short sessions to get your speed up and if at the end opf the exam you have not filled 20 or so pages you have a good chance finish early you almost certainly failed unless your a speed writer and einstein

good luck and all the best

 

[jerrybouncer]

Good luckwith your exam. Relax and you'll be fine!!

 

[gap30]

dont get too excited the next part of the question got me puzzled

State
i. a suitable observation to be recorded on the periodic report if the voltage drop fails to comply
ii. one action which could be taken to rectify the situation in i. above

i. circuit blah blah failed volt drop test code 2
ii. reduce length of circuit?

anyone?

 

[brucelee]

have i got this right, i know this has already been discussed somewhere but wanted to try it off the top of my head

sorry to be a pain in the butt

during the course of the inspection one of the single phase radial circuits supplying an item of fixed electrical equipment is to be checked for voltage drop compliance. The circuit has the following characteristics
load current = 45 amp
circuit length = 80 metres
live conductors = 10mm
a. using the information given in figure 1 determine whether the circuit meets the requirements for voltage drop. Show all calculations

80 x 1.83 x 2 x 1.2/1000 = 0.35136

v = ixr

vd = 45 x 0.35136 = 15.8 volts

230v circuit 5% = 11.5 volts

so circuit does not comply

is this correct?

Hi mate

use formulae number calculation
eg
R =m/ohm/m x 2 x mf x Lenght /1000
=1.83 x 2 x 1.2 x 80 /1000
=0.35136
= 0.35 rounded down
vd = I X R



good luck mate

 

[IQ Electrical]

1 I'd be looking at a code 3 depending on the stated manufacturers tolerances for the fixed load (525.1)

2 Go for increased conductor CSA.

 

[gap30]

just got back, long questions were a doddle, short ones i reckon i got about 5 wrong

State three conditions that must apply before the issue of a minor electrical installation works certificate 3 marks

could i feck answer that one

state the test to be carried out to ensure safety before testing the rcbo 2 marks

hummed and harred for 20 minutes this was the last question, i put Ze then scribbled it out and put PFC

anyways quite optimistic as the long questions were easy, earth fault path drawing for tn-s, resistance one, conduit and trunking inspection which i have studied to the hilt so i prob failed lol

 

[russty]

state the test to be carried out to ensure safety before testing the rcbo 2 marks

hummed and harred for 20 minutes this was the last question, i put Ze then scribbled it out and put PFC

I put functional test of intergral test button!!

 

[gap30]

I put functional test of intergral test button!!

what result did you get for the insulation resistance?

i got 2.11 megohms

 

[russty]

correct here aswell. Finished the exam with an hour to go, just went over everything again. Feel if i dont do this one i need shooting!

 

[gap30]

correct here aswell. Finished the exam with an hour to go, just went over everything again. Feel if i dont do this one i need shooting!

ha ha know what you mean

 

[tony mc]

I would have a few days off now gap or you will go bonkers!!

After going over this post it looks like you have put in a lot of time and effort into your studies and have been encouraged by a lot of the forums members.

Fingers crossed and I do hope you have passed.

Regards

Tony

 

[pirhead]

Hi Mate
here are some things to help your remember stuff

Periodic inspection you are looking for a SADCOW. issues of Safety. Ageing, Deterioration. Corrosion, Overloading, Wear and Tear.

Also Insulation resistance is like a teabag the longer the cable the more perferations so more area to leak out of hence Insulation resistance decreases with length.

Cable resistance is like linking sausages togethr the longer the length the more sausages you have so greater resistance

Also learn the proper terminology for protective conductors. See little map at end of appdx 2
Circuit protective conductors connect to exposed conductive parts to MET. Exposed parts of electrical equpt motors lights etc

Main protective bonding connects gas and water Extraneoues conductive parts to MET. Any EXTRA METAL is Extraneous



Earthing conductor connected between MET and earth electrode

Hope this helps

 

[pirhead]

I think the answer shoud Zs as this verifies the presence of a circuit protective conductor in the first place. No cpc no effective operation

 

[IQ Electrical]

I think the answer shoud Zs as this verifies the presence of a circuit protective conductor in the first place. No cpc no effective operation

Correct, it's Zs, Guidance Note 3 2.7.18

 

[gap30]

all i had going round in my head was Zs but i thought that only applied to TT, with it being a TN-S i was looking at it for 20 mins, anyway now when i think about it i know Zs is the answer, actually during the exam i was pretty thorough and did not rush any questions but i just could not get the answers in my head to some of the questions

as i said i think i have dropped maybe five or six short questions

 

[brucelee]

dont worry Gap mate I reckon you will have done enough easy to doubt the answer during the exam always zs before rcd or rcbo tests all about the test sequence

you know now easy to get confused in exam conditions your gut was telling ypu one thing your head the other go with first thought usually correct unless your certain its wrong 100%

You done it now
the wait begins and goes on and on and on but not forever lol

good luck mate hope ya passed for your effort you deserve it

 

[malcolmsanford]

Hi Mate
here are some things to help your remember stuff

Periodic inspection you are looking for a SADCOW. issues of Safety. Ageing, Deterioration. Corrosion, Overloading, Wear and Tear.

Also Insulation resistance is like a teabag the longer the cable the more perferations so more area to leak out of hence Insulation resistance decreases with length.

Cable resistance is like linking sausages togethr the longer the length the more sausages you have so greater resistance

Also learn the proper terminology for protective conductors. See little map at end of appdx 2
Circuit protective conductors connect to exposed conductive parts to MET. Exposed parts of electrical equpt motors lights etc

Main protective bonding connects gas and water Extraneoues conductive parts to MET. Any EXTRA METAL is Extraneous



Earthing conductor connected between MET and earth electrode

Hope this helps

Think you mean section 2---------Definitions

 

[glasgowbiker42]

Sorry to say passed first time mate but what i would say is i know a lot of bright guys who are in the same position as you.
Apart from the obvious hammering the passed papers how you approach the exam is vital. I.e. Alot of people get caught up with the low value questions at the start and spend to much time on them leaving insufficient time for the high value questions.

 

[gap30]

you know the help and advice i have been given in this thread is amazing, you know i have worked with sparks over the years that would not give you the time of day/or they are rubbish and you would not ask them to wire a dog kennel for you.

Some people on this site have really helped me and been really patient.

Thanks for all your help, i prob learnt more from here than the books lol

 

[pirhead]

If I were to tell u what I have struggled with u wud die laughing....let yourself off the hook

 

[pirhead]

yeah right definitions...Thanks

 

[gaulty]

Personally I wouldn't put yourself under too much pressure end of the day you can always resit! Just forget about the past exams if u get nervous before try taking a pill for travel sickness it might sound silly but I know a few who take them before exams, Uni etc and say it helps, maybe a mind thing but worth a shot. Read all questions carefully and use right definitions.
I did in mine during my fourth year apprenticeship while all the college stuff was still in my head and even then it was hard, goodness knows who the guys who where out of college for years managed it but persevre and you'll get there in the end. GOOD LUCK

 

[bitern]

Doe's anyone know when the July21st 2391 results are announced?

 

[brucelee]

mate the wheels turn slowly at C&G it chould be 42 working days but i waited a lot longer and 5 months for the cert lol

 

[GLENNSPARK]

Sorry to say passed first time mate but what i would say is i know a lot of bright guys who are in the same position as you.
Apart from the obvious hammering the passed papers how you approach the exam is vital. I.e. Alot of people get caught up with the low value questions at the start and spend to much time on them leaving insufficient time for the high value questions.

Go for the higher value questions first...its where the points are.........

 

[La Poste]

Doe's anyone know when the July21st 2391 results are announced?

That's what I'm waiting for.
Haven't had a date for my practical yet, have you?

 

[gap30]

thanks guys for all your help i passed

 

[Sparky Ninja]

You beauty!!​



:hurray::hurray::hurray::hurray::hurray:




A big thumbs up to all on here for being so awesome.

 

[Richard Burns]

Well done, application of forum input and look what you can do. Total success.
Keep up the good work.

Congratulations!

 

[gap30]

thanks guys

 

[brucelee]

well done congratulations mate

 

[La Poste]

Well done Gap, that's another feather in your cap.

 

[gap30]

thanks guys for all your help

 

[trev]

I'm so glad he passed. I did mine about 18 months ago walked the practical failed the theory. Did it again theory last December practical in January the day I found out my daughter was pregnant, my head was so far up my butt I duffed the pscc/pefc tests and was failed. I found out at results time that I'd passed the theory and because I'd walked the theory the time before they passed me for the whole lot so Trev was a very happy sparky + by that time my grandson was here))))))
It is a truly great feeling to get that bit of paper in your hands

 

[gap30]

still have to do the practical part although i have already passed it once

 

[La Poste]

still have to do the practical part although i have already passed it once

Why?
I thought if you passed the practical once you wouldn't have to do it again.

Does the same apply the other way around?
I have passed my theory and my practical is on Tuesday.
If I fail my practical will I have to take both my theory and practical again?