Welcome to your 2365 624 Inspection & testing
1.
Which of the following does the Electrical Safety Council recommend as the best device for proving a circuit has been safely isolated
2.
An insulation resistance test on a large installation gives unexpectedly low readings that are below the minimum expected values according to BS7671. What could be your course of action?
3.
The following readings were taken on a test performed on a ring final circuit, Line to Line 0.8Ω, Neutral to Neutral 0.8Ω, cpc to cpc 0.8Ω . What would be the expected reading between line and neutral at each socket outlet?
4.
An initial check at the ends of a ring final circuit using a low reading ohmmeter will not indicate?
5.
Before carrying out an insulation test which of the following is recommended doing
6.
A polarity test is to be performed on a lighting circuit with an Edison type lamp holder, what is the correct instrument to be used for this test?
7.
An earth fault loop impedance tester records a prospective earth fault current value of 8850 and a prospective short circuit current value of 9190A. What should be the rating of the incoming protective device in terms of fault current?
8.
GN3 recommends that a low resistance ohmmeter should have a range of
9.
The easiest method of confirming polarity on a standard ring final socket outlet circuit is
10.
Isolators are designed to operate under
11.
The main earthing conductor during an external loop impedance test should be
12.
The insulation resistance test voltage for a 400v installation is
13.
Why should the circuit protective conductor be tested before the insulation resistance test?
14.
Test instruments should ideally be calibrated
15.
An insulation resistance test on a small installation that contains no distribution circuits can be
16.
A radial socket outlet circuit is supplied by a 2.5mm2 singles cable and is 20m long. Given that the Ze of the installation is 0.43ohms and the resistivity of each of the cables is 7.41m?/m at 20 degrees celsius, what is the Zs calculation expected to be without testing R1+R2 at 20 degrees celsius?
17.
When completing an EIC on a TNS system which box should be ticked in the means of earthing section
18.
A continuity of ring final conductors test is carried out using a low resistance ohmmeter for what reason?
19.
The image represents which type of earthing system?
20.
The most serious result of basic contact with a live conductor would be
21.
Which of the following would an inspector check to verify voltage drop within a circuit
22.
Which documentation would you not use for a new circuit or alteration of an existing circuit
23.
Which one of the following items is included in the checklist during the initial verification of an installation?
24.
What is the formula for calculating earth fault loop impedance?
25.
The practice of placing insulation tape over a switched circuit breaker during the safe isolation process contravenes which regulation?
26.
The insulation resistance test voltage for a 230v installation is
27.
When a non domestic installation is protected by an RCD, there shall be a fixed notice stating that
28.
What is the benefit of using multi-hasp type padlock when isolating and locking off a circuit for maintenance?
29.
It is recommended that test instruments are nulled to
30.
Which of the following is NOT classed as a live conductor?
31.
On initial verification, performing the continuity of bonding conductors should be done with one end disconnected to
32.
You have been sent to complete a full initial verification and inspection and test on a larger office block. Which of the following items you have been given is unnecessary at this point?
33.
When should an RCD trip when the setting of 1 times the rating of the RCD is used
34.
An intrinsically safe test instrument would be used in
35.
Applying the rule of thumb method, the value of prospective short circuit current for a three phase supply should be