2391 Exam Questions !

[Zenn]

what EICR stands for ?
Electrical inspection certificate report ?

 

[Deleted member 26818]

Electrical Installation Condition Report.
It's the report produced when conducting a Periodic Inspection.

 

[Zenn]

hehe I found it : Electrical Installation Condition Report

 

[Zenn]

honestly I don't have much experience in electrical field, I have worked in food related industry such as takeaways and coffee shops but I want to change my career to an electrician. I have done the 2330 in 2008 and got my 17th edition just 6 month ago, but I still cannot find myself any electrical job..
I thought if I do the inspection and testing course I will definitely find myself a job. I'm still making coffees at Starbucks hehe.

 

[scotsparky]

ii) Two items within the DB which are to be inspected using the sense of sight stating what is being checked for in each case.
to checking that : there are no any crack or visible damaged to the DB or any part inside.
correct labelling and sequencing of all conductors.


You cannot prove correct labelling of circuits by looking at them to fully verify you isolate and test.

I would suggest visual damage,IP rating of D.B,Overated breakers for conductor size, Amount of copper shown at termination, Any sighn of heat damage.

 

[Zenn]

JUNE 2010:

Section B:

The owner of a small industrial unit requires an additional exterior lighting circuit to be installed for security purposes. At the same time the existing electrical installation is to be inspected and tested in order to obtain insurance cover for the premises.

The electrical installation forms part of a 400/230 V TN-C-S system with a Ze of 0.1Ω and a PFC of 4.6 kA. The existing installation comprises 70 °C
thermoplastic insulated single core copper cables contained within a steel trunking and conduit containment system.
A separated cpc is installed for each circuit and is contained within the trunking and conduit.

The three-phase DB is located at the origin of the installation and contains a mixture of BS EN 60898 circuit breakers and BS EN 61009 RCBOs.

Figure 1 Below shows information on the resistance of conductors in mΩ/m
______________________________________
Conductor csa (mm2) | mΩ/m at 20°C
_________________________________
1.5 .......................12.10
2.5 .......................7.41
4.0 .......................4.61
6.0 .......................3.08
10.0 .....................1.83
_________________________________

1.
a) List the documents that must be completed and issued to the client on the completion of the electrical work.

b) List the parties who would be involved in determining the extent and limitation of the inspection and testing of the existing installation.

c) state where the decision reached in (b) above is to be recorded.

d) state the
i) title given in law to the inspector.
ii) legal status of the inspector.

e) List three items of information which must be available to the inspector regarding the distribution network operator's equipment.
_____________________________________________________________________________

2.
a) One part of the building has an area where chemical etching and washing down takes place.

i) List three factors which must be considered when inspecting the containment system in this particular area.

ii) Identify, for each of the factors given in (ai) above, the human senses that would best determine compliance.

b) The owner has agreed that the whole installation may be isolated in order for testing to be carried out. There has been period of one hour
allocated for this work.
List the tests that must be carried out during this period (individual circuits may be isolated after this period)
___________________________________________________________________________________

3. A test of continuity is to be carried out on the main protective bonding conductor to the gas service located 30 (m) from the origin of the
installation.
Describe how this test is to be carried out after safe isolation has been completed. your answer should include

a) initial safety precautions
b) instrument used
c) test procedure
d) final safety procedures.
_________________________________________________________________________________

4. A continuity of ring circuit conductors test is to be carried out on the circuit supplying the office.
The circuit is wired in 2.5 mm2 cable with a 1.5 mm2 CPC. The loop length of the cable is 65 m. All socket outlets are connected directly on the
ring.
Explain in detail, using the information given in figure 1, the three steps required to confirm the continuity of this circuit.
your explanation should include the
. Test instrument
. Test connections and the expected reading at each stage.
Show all calculations.
________________________________________________________________________________

5. Draw a fully labelled diagram showing the complete earth fault loop path for the newly installed lighting circuit. the diagram should identify the
a) Correct system
b) Complete fault path
c) All the component parts of the earth fault loop.
_________________________________________________________________________________

6. During the course of the inspection one of the single phase radial circuits supplying an item of fixed equipment is to be checked for voltage
drop compliance. The circuit has the following characteristics.
. Load current = 45 A
. Circuit length = 80 m
. Live conductors = 10 mm2

a) Using the information in figure 1 determine whether the circuit meets the requirements for voltage drop. show all calculations.

b) 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 (b,i) above.

 

[Paul.M]

Zenn you have approached this forum in the correct manner. Well done sir.

When you post up these questions please have a go at answering them and let us correct you when your wrong. We are happy to help but we are not here to do your homework.

Zenn you've got our attention so don't waist it.

 

[scotsparky]

b) State two items that would be checked during the inspection of the new lighting installation containment system stating what is being checked for in each case.
choosing the correct switches and conductor size.

What has conductor size and switch got to do with th containment system? try BS standard of containment system?


BS number on conduit does is comply wit Appendix 1 of BS7671?
What is the length of run and number of bends? does it meet the requierments?
How many cables are in the containment? Does that comply with spacing factor?



Read more: http://www.electriciansforums.net/i.../64856-2391-exam-questions.html#ixzz28C4Bw3iw

 

[scotsparky]

a) Determine the voltage drop for the circuit if the combined measured resistance of the line and neutral conductors is 0.38 (Ω) and the load current of the motor is 30 (A).

b) Determine whether the voltage drop calculated in (a) above meets the requirements of BS 7671.


Easy marks this one! work out voltage drop Vd= IxLxOhms/1000 (remember resistance is in milli ohms)

Check this as a percentage of the supply voltage power 5% lights 3 % if under that no problem .

Read more: http://www.electriciansforums.net/i.../64856-2391-exam-questions.html#ixzz28C8O33Mp

 

[scotsparky]

2.
a) One part of the building has an area where chemical etching and washing down takes place.

i) List three factors which must be considered when inspecting the containment system in this particular area.

ii) Identify, for each of the factors given in (ai) above, the human senses that would best determine compliance.

b) The owner has agreed that the whole installation may be isolated in order for testing to be carried out. There has been period of one hour
allocated for this work.
List the tests that must be carried out during this period (individual circuits may be isolated after this period)


Another one for easy marks!

Its says chemical etching and washdown so

Suitabuity of containment so IP rating if there is water jets?
Suitability against corrosion? PVC conduit as metal rusts anc corrodes very fast
RCD protection as it will be a special location with water jets (think showers)


all the above is a visual inspection


Inspection and testing.

A true Ze,PFC,PSCC can only be done with main bonds disconnected so full shutdown.
Main bond resistance?
Full insulation resistance can be done if you follow section 2 of GN3 and disconnect imcomming Neutral. Connect line conductors together and test to the main earth point. Be wary of paralell resistances as it will drastically affect readings. It means you do not have to disconnect all lights and equipment suseptable to Insulation testing but has to be noted on limitations.







Read more: http://www.electriciansforums.net/i...4856-2391-exam-questions-2.html#ixzz28CA8R4bV