Welcome to your 2365 623 Fault Diagnosis
1.
The minimum insulation resistance value for a SELV installation, according to BS7671 IET Wiring Regulations is?
2.
Failure to get a reading of polarity using test method one could indicate?
3.
Which of the following would cause insufficient voltage supplying a light circuit?
4.
If a copper conductor was halved in length, the resistance would?
5.
If 2 different sized cables were connected together in parallel and measured using a low resistance ohmmeter, the overall resistance will
6.
It is recommended that test instruments are nulled to?
7.
Which test is the most accurate to test the sensitivity of an RCD?
8.
A test instrument has a calibration date that has passed, what should be your course of action?
9.
Which of the following could be the most likely factor that could affect rectifying a fault?
10.
Which of the following would be the most likely cause of the final light in a lighting circuit not working, when the other lights do
11.
Which device will protect circuits and equipment from transient voltages?
12.
The item shown in the photo serves what purpose?
13.
When should an RCD trip, if the setting of 1 times the rating of the RCD is used
14.
Which of the following would cause a loss of supply to an installation
15.
During a continuity of Ring final conductors test in a domestic building, ten sockets give a R1+R2 reading of 0.5Ω, but an additional three sockets in the garage from the same circuit gives readings of 0.6Ω, 0.7Ω and 0.8Ω respectively. What might that indicate?
16.
The correct safe isolation procedure on a 3 phase circuit will result in a voltage indicating device being connected across terminals, in how many different combinations to ensure it is adequately proved dead?
17.
Which logical step would come first, when approaching fault diagnosis?
18.
Which of the following is the most likely of implications caused from fault diagnostics?
19.
A polarity test is conducted to verify that?
20.
The insulation resistance test voltage for a SELV installation is?
21.
If three conductors equal in length and with a resistance of 0.15Ω each are connected in series, what is the total resistance?
22.
Which is the correct method of disposing of plasterboard on site?
23.
An intrinsically safe test instrument would be used in?
24.
Which of the following should happen in the handover process after fault diagnostics?
25.
If an MCB is able to reset after a small duration of time after it has been operated, what is the likely cause?
26.
Which of the following would NOT be acceptable for performing an insulation resistance test?
27.
Which test is the most logical test to be carried out, to verify an open circuit?
28.
Which is one of the main hazards of an old building with insulated pipes coming from old boilers?
29.
One test that will commonly identify short circuits within an electrical installation is the?
30.
Which of the following is likely to cause a transient voltage spike?
By Neil