2391 sum practical help

SLSpark · Nov 10, 2012

anyone give advice on 2391 course ???? looking to sit this asap

N6rul · Nov 11, 2012

need help for 2394 exam question

Scenario
The building has its own supply and forms part of a 230 v TT System. Ze and PFC have not been measured. All circuits are wired in 70 degree Celsius thermoplastic single core cables, with copper conductors, in surface mounted, galvanized steel trunking and conduit. All accessories, including the distribution board, are metal clad. All circuits are protected by type B circuit breakers to BS EN 60898 Apart from the socket outlet circuit and the lighting circuit which are protected by individual RCBOs to BS EN 61009-1. the main switch is a double pole 100 A, 300 A S-type RCD to BS EN 61008-1.
PLEASE SEE ATTACHMENT FOR DIAGRAMS.

QUESTION 1
The ring final circuit is to be tested prior to connection to distribution board.
A) explain in detail how the continuity of ring circuit conductors test would be carried out.

B) determine the expected results for each stage.

C) a test of external loop impedance is to be carried out to assess the effectiveness of the earth electrode. Describe how this test is to be carried out after safe isolation of the installation has been complet.

Please can someone help. Thanks

NickS · Nov 11, 2012

Hi N6rul, just a quick question for you. If you're at this stage in exams, shouldn't you already know how to answer those questions? .... just asking.

SPARTYKUS · Nov 11, 2012

Re: need help for 2394 exam question

N6rul said:
Scenario
The building has its own supply and forms part of a 230 v TT System. Ze and PFC have not been measured. All circuits are wired in 70 degree Celsius thermoplastic single core cables, with copper conductors, in surface mounted, galvanized steel trunking and conduit. All accessories, including the distribution board, are metal clad. All circuits are protected by type B circuit breakers to BS EN 60898 Apart from the socket outlet circuit and the lighting circuit which are protected by individual RCBOs to BS EN 61009-1. the main switch is a double pole 100 A, 300 A S-type RCD to BS EN 61008-1.
PLEASE SEE ATTACHMENT FOR DIAGRAMS.

QUESTION 1
The ring final circuit is to be tested prior to connection to distribution board.
A) explain in detail how the continuity of ring circuit conductors test would be carried out.

B) determine the expected results for each stage.

C) a test of external loop impedance is to be carried out to assess the effectiveness of the earth electrode. Describe how this test is to be carried out after safe isolation of the installation has been complet.

Please can someone help. Thanks

I think you need to have a go first rather than just ask for "help". What are you thoughts?

If someone just writes out an answer, how is that in any way shape or form going to help you?

Man you gotta get stuck in! Have a go, scan your attempt in, and you will get reams of help (and it will be useful help, the only time you learn is when you get it wrong)

SPARTYKUS · Nov 11, 2012

I'm waiting to assist you! Where's that first stab dude?

NickS · Nov 11, 2012

Re: need help for 2394 exam question

SPARTYKUS said:
I think you need to have a go first rather than just ask for "help". What are you thoughts?

If someone just writes out an answer, how is that in any way shape or form going to help you?

Man you gotta get stuck in! Have a go, scan your attempt in, and you will get reams of help (and it will be useful help, the only time you learn is when you get it wrong)

Exactly what I thought!! I know that anyone who has a go, and gets stuck or their brains getting frazzled, then this is THE place to come to. No one judges here, N6rul don't be afraid to get it out there!!

Richie6187 · Jan 10, 2013

Top stuff, thank you

me1 · Dec 10, 2013

Hi Noticed that this was posted in 2009! As any of it changed since?

Great stuff !!!!!

me1 · Dec 10, 2013

Hi Noticed that this was posted in 2009! As any of it changed since?

Great stuff !!!!!

me1 · Dec 10, 2013

Question about the neon indicator!! Would I have to disconnect line + nuteral from the switch and connect together and then test?
Just started learning electrics. So if anyone as work on the 2394 exam?
Especial with fault finding results!!!!!!

i=p/u · Dec 10, 2013

Maybe put switch to off pisition and put .label up, beware 500v!!!

David Marshall · Mar 8, 2015

The new 1700 series Megger MFT can test PFC line to line but I not buying one untill my 1500 mft fails its calabration and after over 2000 tests it still has a A rating

Pete999 · Mar 9, 2015

brucelee said:
no way mate wish they would make there minds up

thanks for the heads up as i have jsut done 2330 302 and it was one of my questions
because of 2391 i learned insulaton resistance ohmeter
now back to IR tester they are getting money for old rope

Did my 2391 back when Jesus played left back for Bethlehem and the continuity test was carried out using a "low resistance Ohm meter"

David Marshall · Mar 9, 2015

me1 said:
Question about the neon indicator!! Would I have to disconnect line + nuteral from the switch and connect together and then test?
Just started learning electrics. So if anyone as work on the 2394 exam?
Especial with fault finding results!!!!!!

what are you testing and what test are you doing

i i · Jan 8, 2016

Hi. About to sit my skills test and I am OK with everything I think but I'm unsure about carrying out the pfc test. The tester I will get is at three lead megger. Do I need to have the whole installation live to carry out the testing and where would be the points to test. Any help is much appreciated

2391 sum practical help

SLSpark

N6rul

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Attachments

NickS

SPARTYKUS

SPARTYKUS

NickS

Richie6187

me1

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David Marshall

Pete999

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David Marshall

i i

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