2330 level 3 unit 2

unit 2 inspection testing and commissioning

this is a written test and consists of 12 questions
all questions are worth six marks
on exam day you will need atleast 50 marks to gain a pass, so what are you waiting for, get practicing and be ready for D day ;-)



1)
list three widely used tyres of

a wiring sysytem




b wiring enclosure


2)
when making an area safe to work in

a list 3 procedures to be taken before commencing work



b describe the permit to work procedure



3)
when carrying out large contracts

a list three parties likely to be concerned



b state the perpose of a site record


4)describe the use of the following in monitoring the progress of a contract

a a bar chart



b a site diary



c variation order



5) with the reference to the application and the use of residual current devices (RCD)


a list three situations where RCD protection is required



b state the primary function of an RCD



C describe the term nuisance tripping




6)

a explain briefly the importance of a verification of test instruments before performing tests on an electrical installation.



b state the purpose of each of the following types of test instrument

i) insulation resistance tester
ii) tong tester
iii) pscc tester
iv) low ohms meter


7) a 10kW230v shower is supplied using PVC/PVC multicore cable clipped direct to the surface over a distance of 15m. the circuit is protected by a BSEN 60898 type C circuit breaker , the ambient temperature is 25 deg C

determine

a installation method

b design current

c circuit breaker rating

d correction factor

e minimum cable size

f voltage drop


8)
identify three items to be checked during the initial inspection progress for -

a steel conduit



b steel trunking



9)
when completing addititons to a circuit such as an extra socket

a state the type of certificate to be used

b list three item of information that need to be entered on the form

c state to who the form should be given



10)
describe breifly the purpose and types of information which relate to the electrical installation of the following types of drawing

a site plan


b block diagram


c circuit diagram



11)
a explain the importance of coordinating electrical installation contracts with other trades


b describe one example where joiners/ carpenters may be held up due to lack of coordination with electricians working on the same site


c describe one example where plasters may be held up due to lack of coordination with electricians working on the same site



12)
a with the aid of a sketch , show how a 230v single phase supply and a 400v three phase supply is achieved within a sub-station using a transformer with delta connectedn11kV primary windings and the star connected secondary windings
4 marks



b state two reasons for balancing the loads across a three phase four wire system
2 marks