The document provides instructions for completing a two-way lighting circuit installation project. It involves several tasks: 1) Bending conduit, threading conduit pieces, and attaching the conduit to a consumer unit and wall using fittings. 2) Marking and cutting conduit lengths, threading the pieces, and attaching them together using couplings to create the circuit layout. 3) Wiring the circuit by threading wires through the conduit, connecting them to switches and lights in the correct configuration. 4) Testing the circuit for continuity and insulation using a multi-meter to ensure it was correctly installed before energizing.

1. WTA.05 Two Way Conduit Lighting
To beginthisjobI had to learna whole new setof skills.Istartedbyreceivinginstructionfrommy
tutor ontechniquesof pipe bending. Thiswasdone usingapipe bendingmachine.
The outcomesof the taskwere to:
 Benda 900
bendin20mm metal conduit
 Use a die and cast to create a threadedconduitendpiece
 Attach the conduittoa ConsumerUnit(CU) usingthe correct fittings
 Create a "kick"bendto the C.U
 Attach the assemblytothe wall usingthe correctfittings
Afterbeingshownthe above tasksbymytutor, I proceededtothe WTA.05 project.
I startedby makingsure mywork areawas cleanand tidy,free frommaterialsandequipment.I
gatheredthe toolsIwouldneedforthe job,and collectedacomponentsbasket fromthe store.I
alsocollectedseparately,one lengthof 20mmmetal conduit.
The firsttask was to markout the job onmy workboard. Thisincludedthe componentlocationsand
the conduitlayout.Thiswasdone to the layoutdiagraminmy practice book.
First Fix
I nextproceededtomarkout andcut the 20mm steel conduittothe correct lengths,Iwouldneed4
lengthsforthisjob.Each piece of conduitwasthreaded,thiswasdone withastock and die.Ifirst
securedthe pipe lengthsinapipe vice.Thiskeepsthe tubingsteadywhilstworkisbeingcarriedout.
I startedby puttingthe die onthe endof the tubing,andmakinga small turnto start the threading
process;afterthisthe die was removed.Iproceededtoapplya small amountof cuttinglubrication
to the conduitend.Thiswouldhelpgive me asmooththreadcuttingand preventdamage tothe
tubing.The threadingwascarriedoutby turningthe die 3 times,thengoingbackover3 times.This
continueduntil Ihada threadof roughly20mm. Thisprocesswascarried outon each conduitlength
(excludinglarge lengthforbending.)
The nextstepwas to putthe 900
bendinthe large lengthof conduit.Thiswasdone usinga pipe
bendingmachine.Afterbendingthe pipe andcheckingitforsquare;Iproceededtothreadthe ends
of thislengthasdone before.Onthe topof the 900
bendthe threadingwasmade longer.Thiswasto
incorporate a runningcouplingjoint.The threadingwasmade the lengthof afull coupler,plus5mm.
I beganattachingthe conduit to the work board.
FirstlyIattachedthe inspectionelbow tothe CU(Fig.3).Thiswasdone witha threadedgland(Fig.2).
The gland wastightenedwithabushspanner.Ithenattachedthe firstlengthof conduit,thiswas
done byscrewingthe conduitintothe inspectionelbow.Ithendrew linesdowneachside of the
conduitsoI could place a conduitsaddle inthe center(Fig.1). The conduitwasthenremovedsoI
couldfitthe saddle to the back boardwitha 20mm woodscrew.The conduitwasattachedagain,this
time withthe lampholdermetal backbox attachedto the end.The saddle hadthe toppiece
screwedinto secure the conduitandanother20mm woodscrew fixedthroughthe lampholderback
box.
. Fig.1 Fig.2 Fig.3

2. The same processwasrepeatedfrom the undersideof the lampholderbackbox to secure the first
metal cladswitch.Thisleftthe attachmentof the secondswitchandthe 900
conduitbend.
To connectthispiece of conduitI wouldhave tocomplete arunningcoupling.Istartedthisprocess
by attachinga lockingringand a couplertothe endof my elbow.Ithencut andthreadeda small
piece of conduittobe threadedinsidethe lampholderbackbox.These 2pieceswere butted
togetherandthe couplerturnedinplace.Thisconnectedthe conduit tothe lampholderbackbox,
and the lockingringbehindthe couplersecuredthe piecestogether.A saddle wasattachedonthe
vertical piece of tubing,aswell asanotherlightingswitchbackbox.Back boxes were securedwith
20mm woodscrews.
Thisended the firstfix of the project.
SecondFix
The wiringof the conduitsystembeganwithcutting1lengthof blue/neutral/rnwire,4lengthsof
brown/line/r1wire,and2lengthsof greenyellow/earth/r2wire.These were all single wires1.5mm.
I removedthe coveronthe inspectionelbowandthreadedthe neutral wire first.Ithenthreaded1
line wire fromthe CU to switch1; two line wiresfromswitch1to switch2; and a final line wire from
switch2 to the lampholder.Earthwire was threadedfromthe CU, to the lamp andfrom the lampto
switch1 and 2. Thiswouldact as the circuitprotective conductor(CPC).All wireswere strippedto
the cores at the endsreadyfor terminating.
In the lampholderbackbox,I connectedthe rn wire tothe neutral terminal onthe lampholder.Also
the line wire fromswitch2 connectedtothe line terminal onthe lampholder.
Switch1 connectedthe commonterminal tothe consumerunit(B16MCB), whilstthe tworemaining
line wiresconnectedinterminalsL1and L2. (L1 and L2 terminal wireswere markedaccordinglyon
installation,soeasyidentificationwouldbe possibleatthisstage.) All circuitprotectiveconductor
(CPC) wireswere connectedinthe earthterminal,includingthe CPCwire fromthe metal switching
box.
Switch2 hada line wire fromthe commontothe lampholder.TerminalsL1and L2 were connected
withL1 andL2 from switch1.
At thisstage,all switchcoverswere attachedtothe back boxes.The lampholderandCU wireswere
leftaccessible fortesting.
Dead Test
Continuitytestingwasdone withamulti-functional tester(MFT). Iusedpinconnectionsfromthe
MFT, connectedtothe positive andnegative portsonthe back of the unit.The unitwassetto ohms.
Placingthe pinsonthe lightingrose terminals,ItookreadingsforR1-R2,R1-Rn, andR2-Rn. (Whilst
takingthe readings,the correspondingconnectionswere made withinthe consumerunit,using
terminal blocks.)
The rn wastestedfromthe neutral terminal inthe ceilingrose,the r2from the earthterminal,and
the r1 fromthe looplive terminal.Whentestingthroughthe line connection,switches1and 2 were
switchedtotestthe functionality.
Insulationresistance wasalsocarriedoutwiththe MFT, usingthe crocodile clipconnections,again
inthe positive andnegative portsof the MFT. I connectedthe clipstopairedwiresinthe consumer
unit,(R1-R2,R1-Rn, and R2-Rn) the unitwas setto 500v. Whilstthe wireswere connectedIheld
downthe testbuttonon the unit;thisputs 500v throughthe circuit to testforany damage to
insulationortoughingwires.
Whentestingforcontinuity,bytestingall three wirespairedtogether, (R1-R2,R1-Rn,and R2-Rn)
thisprovespolarityinthe circuit.

3. Live test
Afterall mydeadtest wascompleted,I movedontothe live test.Thiswascarriedoutunderthe
supervisionof atutor. The consumerunitwasfirstconnectedtolive power.The masterswitchand
MCB were switchedon,providingpowertothe circuit.The switcheswere pressedsimultaneouslyto
testthe functionalityof the switchesworking.All testscame backcorrect.