An Awful Feeling This

[gap30]

To determine that the value is low enough to allow operation of the overcurrent protective device within the time specified.

thanks i am tired i just did the dec 2010 paper and it drained me ... i just need the answers checking now

 

[La Poste]

To determine that the value is low enough to allow operation of the overcurrent protective device within the time specified.

Would it be OK to say protective device instead of overcurrent device or am I splitting hairs here?

 

[La Poste]

Gap I'm doing the same as you mate, past papers.
And it's doing my head in aswell.

 

[IQ Electrical]

Would it be OK to say protective device instead of overcurrent device or am I splitting hairs here?

Absolutely fine, whatever sticks in your mind.

 

[gap30]

Gap I'm doing the same as you mate, past papers.
And it's doing my head in aswell.

i had a night off last night mate, but i reading today in work and i got home at 5, started revising at 6 just finished, also got the on site guide and bs7671 now as well, the on site guide is a great little book

 

[gap30]

find this question confusing

an insulation resistance test is to be carried out to confirm electrical separation of one circuit from another circuit contained in the same conduit. State the

a) test connections required to confirm electrical separation (2 marks)
b) minimum acceptable value of insulation resistance (1 mark)

by electrical separation i take it they mean 2 x230v circuits in one conduit? ie two separate lighting circuits? would this not be ascertained by the R1 + R2 - mind you that does not include the neutral (but you could bell that out to make sure)

or do they mean electrical separation in its purest form ie for fault protection?

 

[JUD]

find this question confusing

an insulation resistance test is to be carried out to confirm electrical separation of one circuit from another circuit contained in the same conduit. State the

a) test connections required to confirm electrical separation (2 marks) -- Test between L+N of circuit 1 and L+N of circuit 2.
b) minimum acceptable value of insulation resistance (1 mark) -- 1MΩ. Anything under 2MΩ needs further investigation.

by electrical separation i take it they mean 2 x230v circuits in one conduit? ie two separate lighting circuits? would this not be ascertained by the R1 + R2 - mind you that does not include the neutral (but you could bell that out to make sure)

or do they mean electrical separation in its purest form ie for fault protection?

My ​blue

 

[Deleted member 26818]

find this question confusing

an insulation resistance test is to be carried out to confirm electrical separation of one circuit from another circuit contained in the same conduit. State the

a) test connections required to confirm electrical separation (2 marks)
b) minimum acceptable value of insulation resistance (1 mark)

by electrical separation i take it they mean 2 x230v circuits in one conduit? ie two separate lighting circuits? would this not be ascertained by the R1 + R2 - mind you that does not include the neutral (but you could bell that out to make sure)

or do they mean electrical separation in its purest form ie for fault protection?

Conducting the R1 + R2 test on each circuit, would not prove that the two circuits are not connected at some point.
All it would prove, is that the line and earth are continuous between where you are testing, and where you have connected the conductors together.
The method used is as JUD states, the live conductors of one circuit connected together tested to the live conductors of the other circuit connected together.

 

[gap30]

Explain why it is necessary to determine the earth fault loop impedance value of a circuit.

i dont know the correct wording of this one, i know the theory

its to establish there is an effective earth fault path back to the point of earth ie supply electrode, sheath of cable, pen conductor i just need to get the terminology right and i have looked through the regs, gn3 on this one and cannot find the answer there is plenty of info on eli testing

 

[gap30]

To determine that the value is low enough to allow operation of the overcurrent protective device within the time specified.

my god i have lost the plot, i asked the same question yesterday, my head is hurting

you need a good memory to do this exam, its partly a memory test

 

[La Poste]

Regarding electrical separation, testing between live conductors of one circuit and then the other I understand fully but what about the earth's of each circuit or at least the earth circuit supplying the primary side of the transformer, do we also test the earth circuit of the primary side for electrical separation with the secondary?

Thanks.

 

[Deleted member 26818]

Yes you would need to conduct an IR test between the SELV conductors connected together and earth at 500V d.c.

 

[La Poste]

A note to spin.

Is that your bike in the photo?

 

[Deleted member 26818]

One of them yes.

 

[gap30]

still getting caught by silly mistakes on questions ie not reading them properly

MUST READ QUESTIONS THOROUGHLY HOW MANY TIMES?