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Question 1

Why is a initial verification test carried out according to BS7671

Answer 1

To ensure safety of circuit

Question 2

State 3 safety checks to be carried out on test equipment before they are used

Answer 2

Test leads are insulated
Probe ends are between 2 and 4 mm
Visual for any damage on machine

Question 3

State the minimum IP code relevant to the top of an accessible DB

Answer 3

IP4X

Question 4

State what X means in IP code

Answer 4

X = no protection

Question 5

What is the IP code for the front of a socket

Answer 5

IP2X

Question 6

Electrical installation certificate comprises of 3 documents state what they are

Answer 6

Schedule test result
Schedule of inspection
Installation certificate

Question 7

Electrical installation certificate can have 3 different signatures who would these people be

Answer 7

Constructor
Tester
Designer

Question 8

3 reasons why a polarity test should be carried out

Answer 8

• ensure all line conductors are switched and fused
• Accessories are connected correctly

Question 9

State 2 things that could cause reduction in conductor resistance

Answer 9

• reduce cable size
• reduce the length of the cable

Question 10

List 5 external influences that would be checked for on a typical domestic installation when considering the selection of equipment

Answer 10

Vermin
Moisture
Weather
Temperature

Question 11

Give 2 reasons why a client should keep the completed initial verification documentation

Answer 11

• when it needs to be tested again it will say on the document all the information
• to confirm it complies up to date with REGS

Question 12

If you were not using a tester how would you confirm polarity on a socket circuit

Answer 12

Using senses like sight to confirm at each socket all the correct colours of cables are in the correct terminals

Question 13

State 2 checks that would be made on the instrument prior to carrying out the test

Answer 13

• they will be checked using a pricing unit or agains a known source
• leads will be checked to GS38 regulations so that they are safe

Question 14

An IR test is to be carried out on a DB
what test instrument should they use

Answer 14

Insulation resistance tester

Question 15

Name 5 values that should be recorded on a schedule of test results following a successful completion of the inspection and test of a ring socket outlet circuit

Answer 15

R1+R2
rn
r1
r2
Polarity

Question 16

List 4 measures that the inspector can put in place to ensure the safety of others whilst inspection and testing is undertaken

Answer 16

Barriers
Signs

Question 17

List the dead test in order

Answer 17

Continuity , IR , polarity , earth electrode

Question 18

If the earth fault loop impedance is too high state 3 consequences of the result

Answer 18

• may not trip in time
• shocks
• not enough current to trip the breaker

Question 19

Why do we carry out test in certain order

Answer 19

Allows you to work out the next test result giving you a rough idea on what the result should be for the next test

Question 20

1 What tester would carry out a earth electrode test

Answer 20

Earth electrode meter