An Awful Feeling This

[La Poste]

It's the right answer but you would probably only get one mark because each of your answers are for fire protection, the same thing.

 

[La Poste]

I'm trying to learn my disconnection times but can't seem to find them all in one place.

TT disconnection time is 0.2 seconds and 1 second.
TN is .4 and 5 seconds.

Do I need to know any more disconnection times other than 0.2 seconds and 1 second
And also 0.4 seconds and 5 seconds.
Is there a handy little table of disconnection times floating about that anyone knows about?
I sure would appreciate it.

Edit Page 46 and 47 of BRB.

 

[gap30]

It's the right answer but you would probably only get one mark because each of your answers are for fire protection, the same thing.

Thanks for that you have given me some food for thought there, i am going to go back and look at the previous answers you gave for the question

 

[gap30]

State the test instrument to be used to carry out a resistance measurement of an earth electrode

a) that forms part of a TT system that is protected by a 100mA RCD (1 mark)
b) used to earth a three phase transformer (1 mark)
c) used to earth a generator. (1 mark)

earth loop impedance tester for all three or earth electrode tester for all three

 

[La Poste]

Thanks for that you have given me some food for thought there, i am going to go back and look at the previous answers you gave for the question

The best answer is the one below but adding fire protection as an extra one because we then have three distinctly different scenarios.
That would give us top marks.

I would have use at the origin of the installation for exhibitions shows and stands Reg 711.410.3.4 and also temporary installations for structures, amusement devices and booths at fairgrounds Reg 740.410.3 rather than your last 2.

 

[IQ Electrical]

State the test instrument to be used to carry out a resistance measurement of an earth electrode

a) that forms part of a TT system that is protected by a 100mA RCD (1 mark)
b) used to earth a three phase transformer (1 mark)
c) used to earth a generator. (1 mark)

earth loop impedance tester for all three or earth electrode tester for all three

The ELI tester should only be used on an RCD protected TT system due to the (probable) higher values of Ra measured.

 

[La Poste]

State the test instrument to be used to carry out a resistance measurement of an earth electrode

a) that forms part of a TT system that is protected by a 100mA RCD (1 mark)
b) used to earth a three phase transformer (1 mark)
c) used to earth a generator. (1 mark)

earth loop impedance tester for all three or earth electrode tester for all three

Earth fault loop impedance tester for a
Earth electrode tester for b and c

 

[gap30]

Earth fault loop impedance tester for a
Earth electrode tester for b and c

thats what i thought just wanted a second opinion

 

[gap30]

List three items of fixed electrical equipment that may need to be disconnected from a domestic installation before carrying out an insulation resistance test.

1. lamps,capacitors etc
2.any voltage sensitive equipment
3. any pilot lights or neon indicators

is this satisfactory

 

[IQ Electrical]

List three items of fixed electrical equipment that may need to be disconnected from a domestic installation before carrying out an insulation resistance test.

1. lamps,capacitors etc
2.any voltage sensitive equipment
3. any pilot lights or neon indicators

is this satisfactory

Be specific, Dimmers, PIR detectors, Fluorescent ballasts etc.

 

[gap30]

this little sh*t has been bugging me for days

List, in the correct sequence, the first three tests to be carried out on a newly installed lighting circuit.

continuity of protective conductors
insulation resistance
polarity or earth loop impedance (Zs)

i have been speaking to a couple of very experienced lads about this today and even they were not sure i would be more likely to believe its

continuity of protective conductors
insulation resistance
earth loop impedance

 

[La Poste]

Polarity

 

[IQ Electrical]

this little sh*t has been bugging me for days

List, in the correct sequence, the first three tests to be carried out on a newly installed lighting circuit.

continuity of protective conductors
insulation resistance
polarity or earth loop impedance (Zs)

i have been speaking to a couple of very experienced lads about this today and even they were not sure i would be more likely to believe its

continuity of protective conductors
insulation resistance
earth loop impedance

Go with polarity and remember ring final continuity if they change the question to 'a new ring final circuit' they like to mix it up!

 

[La Poste]

Which of the below instruments need leads compliant with GS38.

1. Earth fault loop impedance tester.
2. continuity tester.
3. insulation resistance tester.
4 Approved voltage indicator.

:hat:

 

[gap30]

a) List four actions to be taken by the inspector to ensure the safety of the community centre staff during the inspection and testing process. (4 marks)
b) List the test instruments required to complete the testing of the installation. (5 marks)
c) Identify, for each instrument listed in b) above, those that require leads to GS 38. (4 marks)
d) State the test(s) that can only be carried out with the supply to the whole installation switched off. (2 marks)

a) warn others, warning signs, safely isolate and lock off, cordon off areas while testing - will this do
b) low-resistance ohmmeter, insulation resistance tester, residual current device tester, earth loop impedance tester, prospective fault current tester or prospective short-circuit current tester - which one
c) LRO, IRT,RCD,ELIT,PFC
d) Ze, PFC, bonding conductors continuity - in real life no but in 2391 land?


where an electrical installation cannot be isolated from the supply, the protective and equipotential bonding conductors must NOT be disconnected as,under fault conditions the exposed and extraneous-conductive-parts could be raised to a dangerous level above earth potential