UEENEEG109A

Download Solution Now

ELECTRICAL ENGINEERING

UEENEEG109A

Develop and Connect Control Circuits

Assessment 1,2,3

Students name: .

Date: .

Group: ..

Instructions to Students:

Where questions have a selection of answers to choose from, select the most correct answer to the question.

Questions with no answer are deemed incorrect.

For this Unit of Competency the student must achieve:

60% of the total marks indicated

For overall grading will show AP on successful completion

Marks Available Marks Obtained Percentage 60% Achieved

36 Yes / No

Lecturer:. Date:..1Convert the wiring diagram into a circuit diagram showing th control circuit only.

401320141605

4 marks

2The difference between the control and power circuits is emphasised on a circuit diagram by:

Separating the control and power circuits

Drawing the power circuit above the control circuit

Drawing the power circuit with thicker lines

All of the above

None of the above

1 mark

FUSED SUPPLY

3Draw in the connecting wires on the wiring diagram to enable the two stop buttons and the two start buttons to operate the coil of the contactor correctly.

N/o

START

STOP

8 marks

4Forward/Reverse with electrical interlocking,

STOP

FORWARD

TOL

K2-2

COIL

K1-1

REVERSE

COIL

K1-2

K2.1

4.1The function of contacts K2-2 and K1-2 is to:

Hold in contactors K1 and K2

Allow for the addition of a timer circuit

Provide a time delay in the circuit

Provide interlocking between contactors K1 and K2

1 mark

4.2Pushing the forward button will:

Cause contactor K1 to energise and isolate contactor K2 through contact K1-2

Operate contactor K2 and isolate contactor K1 through contact K2-2

Operate contactor K1 and isolate contactor K2 through contact K2-2

Cause contactor K2 to energise and isolate contactor K1 through contact K2-2

1 mark

4.3Pushing the Reverse button will:

Cause contactor K1 to energise and isolate contactor K2 through contact K1-2

Operate contactor K2 and isolate contactor K1 through contact K2-2

Operate contactor K1 and isolate contactor K2 through contact K2-2

Cause contactor K2 to energise and isolate contactor K1 through contact K2-2

1 mark

5If more than one stop button is needed in a control circuit they must be placed:

In series with one another but in parallel with the coil

In series with one another but in series with the coil

In parallel with one another but in parallel with the coil

In parallel with one another but in series with the coil

1 mark

Assessment 2

1The overload provides protection for:

The cables feeding the electrical equipment

The switchboard feeding the electrical equipment

The electrical equipment which is overloaded

The sub-board which supplies the electrical equipment

1 mark

2Where is the overload installed?

In the control circuit only.

In the power circuit only

In the power circuit and the contacts are in the control circuit.

In the control circuit and the contacts are in the power circuit

1 mark

3Thermostats are used to:

Vary the temperature of a material

Detect a temperature set point

Detect the temperature of a material

Vary atemperature set point

All of the above

None of the above

1 mark

4Thermostats are used in the control of:

Presses

Compressors

Air conditioning systems

Heating installations

All of the above

None of the above

1 mark

Assessment 3

1If the stop and start buttons are checked to be ok yet there is no supply to the coil you would suspect:

The stop button is faulty

The start button is faulty

The fuse has blown

The hold in contact is faulty

The coil is open circuited

The coil is short circuited

2 marks

2Operating the start button causes the contactor to operate but drops out when the button is released:

The stop button is faulty

The start button is faulty

The fuse has blown

The hold in contact is faulty

The coil is open circuited

The coil is short circuited

2 marks

3The diagram on the next page illustrates a freezer room which uses the following controls:

Head pressure cut out

Low pressure cut out

Oil pressure cut out

Storage room thermostat

Defrost pressure terminator

Study the diagram and answer the following questions relating to it:

3.1Which control/s can be removed from this system without isolating the refrigerant charge?

3.2Which control/s requires the compressor to be isolated from the refrigerant charge before removal?

3.3Which control/s must have the refrigerant charge pumped down into the liquid receiver before removal?

6 marks

4Study the diagram on the next page and answer the following questions relating to it:

4.1When the refrigeration system is operating normally will the pressure switch be open or closed?

4.2Can the wiring connections to terminals L and M be interchanged? Explain!

4.3Why should oil pressure controls be of the manual reset type?

6 marks

6 Marks

5Describe in detail the sequence that occurs in the control circuit to allow the air compressor to start and run then stopand re-start in the selected modes from initial(no pressurised air in tank) start up:

5.1S2 in the Manual position

Start and Run

Stop

Restart

5 Marks

5.2S2 in the Automatic position

Start and Run

Stop

Restart

5 Marks

6For the following wiring diagram, neatly draw the control circuit only using AS1102 symbols.

629920325120Note: All identification numbers must be transferred from the wiring diagram to the control circuit diagram.

-98425608965

ELECTRICAL ENGINEERING

UEENEEG109A

Develop and Connect Control Circuits

Assessment

Students name: .

Date: .

Group: ..

Instructions to Students:

Where questions have a selection of answers to choose from, select the most correct answer to the question.

Questions with no answer are deemed incorrect.

For this Unit of Competency the student must achieve:

60% of the total marks indicated

For overall grading will show AP on successful completion

Marks Available Marks Obtained Percentage 60% Achieved

36 Yes / No

Lecturer:. Date:..1Draw and label a schematic ladder diagram showing a hold on circuit using SI symbols of a single control circuit containing the following elements.

-1111251841503 marks

2Duplicate the above diagram with all circuit elements and add a remote start and a remote stop to the circuit.

19051168402 marks

3Design a control circuit that will allow a 3 motor to be reversed in rotation from clockwise to an anticlockwise direction utilising two contactors. The motor is to be protected by a single thermal overload in either direction.

The contactors are not to operate at the same time.

The contactors are to be latched when in operation.

Use two separate start buttons, one marked clockwise and the other anticlockwise that initiate the start sequences.

The contactors are to be interlocked.

15875772160There is to be one stop switch to remove power from both contactors to end the sequence.

Use the correct circuit symbols and label/name their functions i.e. F1, F2.

8 marks

4The following spray booth air compressor control circuit will activate when the air pressure in a cylinder falls to a pressure of 10 PSI and cut out when the 15 PSI is reached, the compressor can be manually switched or placed on automatic by a single switch.

Describe in detail the operation of the circuit when the switch is placed in the automatic mode by interpreting the following diagram;

553085105410

6 Marks

5 What is the function of the shading ring in an AC contactor?

1 mark

6 Using a waveform diagram/sketch describe how the shading ring achieves this purpose in Q 5 above?

4 marks

7 Draw the correct symbol for a time Delay Relay Delay on

1 mark

8 If forward/reversing contactors did not have any means of interlocking, explain what would occur if both contactors were energised simultaneously!

2 marks

9 Where are:

9.1The thermistors for overload protection located?

1 mark

9.2The thermistor control contacts located?

1 mark

10An overload protection device is used to protect an electric motor:

In which circuit (either power or control) do overload protective devices for an electric motor usually;

10.1sense the overload:

10.2operate in:

2 marks

11In a non fail safe jogging circuit, explain the fault that may occur if the jog button is released rapidly.

2 marks

12Draw the safety circuit showing how two people can operate an electrical machine. The circuit shall include protective devices, four start buttons and one contactor coil.

-76200263525

3 marks

Electrical

UEENEEG108ATroubleshoot and repair Faults in LV electrical apparatus and circuits

Theory Assessment

Name:Date:Instructions to Candidate

All questions to be attempted using the response method/s indicated.

Include all AS Standards references where indicated/required

Reference standards allowed for this test are: AS/NZ 3000: 2007,

Mobile Phones policy applies

To gain a:

PASS you must achieve70% (22/31)

Practical projects to complete and attach to this assessment:

Verification test board assessment results sheet.

OTR inspection sheet for a simulated or real installation fully filled out

At least one fault finding practical results sheet for domestic.

At least one fault finding practical sheet for motor control circuit

Final Theory Grade_________________________________________

All Practical sheets attached_________yes / No

Assessor__________________________________Date__________________

Dead testing is the preferred option but under what conditions is the testing or troubleshootingof energised circuits acceptable?

2 marks

List three major hazards that may be encountered in live electrical testing.

3 marks

What is the fundamental safety process before conducting de-energised testing?

2 marks

What results would you expect of an electrical insulation test on a newly installed circuit?

1 mark

Quote minimum acceptable value and rule for Q 4

Clause_______________

2 marks

When taking electrical measurement how are the following connected in circuit

Voltmeter

Ammeter (not clamp type)

2 marks

List three common testing devices for electricians to use.

3 marks

Why is it necessary to take care in placing and ohmmeter in a circuit?

1 mark

Briefly summarise the purpose of Visual inspection.

1 mark

Are visual inspections a Shall or Should requirement

Clause____________________

and define what the appropriate word means.

Clause____________________

2 marks

You are using a Kyoritsu 6011A tester on Loop (FLZ) measurement setting and get a reading of 1.90 ohms. Circuit is protected by 16A C type C/B with 4 mm2cable.

Where exactly would you find the maximum permitted impedance for a FLZ in a final sub-circuit?Table_________________

Does FLZ comply?

2 marks

Describe in dot points the (best) method of locating a fault in commercial lighting circuit with 14 high bay lights. The 16A circuit breaker is tripping instantly when the light circuit is energised. Include test instruments you use, what setting these are set to and results that indicate a fault.

5 marks

A Socket Outlet circuit in an existing domestic dwelling trips its 30 mA RCD/MCB supplying kitchen, one bedroom and the laundry area. Flag indicates in protective device.Home owner is present when you attend.

In dot points

describe your troubleshooting process including questions to owner that would determine the likely fault

describehow would you confirm the likely fault this using test instruments, include measurement method and instrument results that indicate the fault.

5 marks

SECTIONA MULTIPLE CHOICE30 MARKS

For each question in part A, identify the response you consider best answers the question by placing its identifying letter in the space provided on the separateanswer sheet.

1 MARK awarded for each correct answer.

The most suitable protection against indirect contact with live electrical parts of electrical

equipment is the use of a -

(a) residual current device (RCD)

(b) surge diverter

(d) voltage dependent resistor (VDR)

The maximum disconnection time to provide protection against indirect contact with live

parts for a circuit supplying a single phase, 40A, 230V sub-main is -

(a) 30 milliseconds

(b) 0.4 seconds

(d) 5 seconds

The magnetic mechanism of a thermal-magnetic circuit breaker -

(a) operates by heating a bimetal strip

(b) operates on long overloads only

(d) hasan inverse time characteristic suitable for short circuit protection

The minimum size equipotential bonding conductor required for conductive water piping is?

(a) 2.5 mm2

(b) 4 mm2

(d) 10 mm2

When a fault occurs to the conductive frame of an electrical apparatus, this creates a dangerous voltage. This voltage is called what?

(a) Supply

(b) Touch

(d) Induced

A major factor that directly affects fault-loop impedance in an MEN installation is the -

(a) soil resistivity

(b) power rating of the load

(d) CSA of the main earthing conductor

The inverse-time characteristic for an M type HRC fuse, used to protect an induction motor,ensures that -

(a) if the motor sustains an extended heavy overload the fuse will not blow

(b) if current in excess of rated current flows during starting the fusewill not blow

(d) if an internal short-circuit occurs in the motor, the fuse will give sufficient time for the

fault to clear

The value of current in a C type circuit breaker that ensures tripping operation in

conventional time is -

(a) 1.45 times the nominal current rating of the breaker

(b) 1.6 times the nominal current rating of the breaker

(d) 12.5 times the nominal current rating of the breaker

A device used to protect sensitive low voltage electrical and electronic equipment against

over voltage is -

(a) a surge diverter

(b) a HRC fuse

(d) a fault current limiter

The minimum size copper earth conductor for a 3-phase industrial oven supplied by 35mmcopper active conductors is -

(a) 4mm

(b) 6mm

(d) 35mm

The term discrimination, as applied to circuit protection, means -

(a) circuit protection at the main switchboard should be the first to operate

(b) the fuse or circuit breaker with the highest fault current rating should operate first

(d) the circuit protection should be able to distinguish between a short circuit to earth and ashort circuit between live terminals

Miniature circuit breakers have an arc extinction chamber that employs the use of -

(a) heavy duty silver contacts

(b) a fast acting spring mechanism

(d) a very sensitive trip release mechanism

An RCD used in a domestic installation is designed to limit the touch current to what maximum value?

(a) 30mA

(b) 10mA

(d) the circuit breaker rating

The trip-free characteristic of a circuit breaker means it -

(a) is rated at more than 6kA

(b) cannot be held in the on position while a fault exists

(d) will not trip on overloads that are less than 150% of rated current

The maximum value of current that may flow in the electrical system during a short circuit is called the -

(a) let through value of current

(b) prospective fault current

(d) trip or fusing current

An off the shelf circuit breaker for general use would have a tripping current and time/curve characteristic designated astype -

(a) A

(b) B

(d) D

If a 3-phase 20A socket outlet is to be protected by an RCD, then the conductors that must be monitored by the RCD are -

(a) all active conductors

(b) any active conductors and the neutral

(d) all active conductors and earth

The primary function of over-current circuit protection in an installation, is to -

(a) protect the circuit conductors from damage due to overheating

(b) reduce the effect of electric shock

(d) protect the appliance from damage due to overheating

The minimum value of current, required to ensure the instantaneous tripping operation of a

type D circuit breaker is -

(a) 4.0 times the nominal current rating of the breaker

(b) 7.5 times the nominal current rating of the breaker

(d) 15.0 times the nominal current rating of the breaker

The fault-loop impedance in a circuit is -

(a) the cause of voltage drops in normal circuit operation

(b) regarded as zero ohms

(d) the impedance of any active to neutral fault

Which of the following provides all-round fault current protection?

(a) HRC fuse

(b) RCD

(d) Isolation switch

The safety / fundamental principles of AS/NZS 3000 are set out in -

(a) the Code of practice (COP) for low voltage wiring

(b) section 1 of AS/NZS 3000

(d) the NSW installation and service rules

Electrical installations are arranged and divided into circuits to -

(a) facilitate safe operation and avoid nuisance tripping

(b) allow thorough inspection and testing on individual parts of an installation

(d) all of the above

The number of main switches permitted in a domestic main switchboard would be -

(a) one for each individual circuit

(b) one for each separate tariff

(d) no limit

Daily and seasonal demand within an installation refers toa change in -

(a) network demand as a result of other customers connecting to the distribution network

(b) an installations varying demand due to changing load requirements throughout the day as a result of changing processes or seasonal load

(d) the price paid per kilowatt hour of energy used by a customer

A circuit wired and connected as an isolated and separated circuit shall be -

(a) connected at extra-low voltage (ELV) only

(b) not be separated from other circuits

(d) connected to socket outlets only

The return path taken by fault current when a fault occurs on an exposed conductive part isvia the -

(a) circuitprotective earth conductor

(b) main earth conductor

(d) circuit neutral conductor

With regards to earthing, a PEN conductor is a -

(a) potential, earth and neutral conductor

(b) combined protective earth and neutral conductor

(d) green/yellow coloured conductor

The network authoritys kilowatt hour meteringand service equipment would usually be installed -

(a) at any nominated distribution board

(b) at the point of supply

(d) in the main switchboard

Where designated emergency / safety services are installed within an installation -

(a) a separate and distinct main switch shall be provided for each emergency service

(b) the emergency circuits need not be separated from the non emergency circuits

(d) the number of emergency service main switches shall be limited to one.

SECTIONB - SHORT ANSWER QUESTIONS40 marks (2 marks each)

Use AS/NZS 3000 to fully answer each question.

Write your answer to each question in the space provided on the answer sheet.

You MUST include AS/NZS 3000:2007 clause number with each of your answers to obtain full marks.

List three causes of overvoltage within an electrical installation?

Name two types of under-voltage protection recommended by AS/NZS 3000?

What is the maximum residual leakage current recommended to prevent a 30mA RCD fromcausing nuisance tripping?

What is the maximum recommended length a power circuit can be in a domestic installation supplied by a 20A type C circuit breaker, so that it meets fault loop impedance requirements?

What are the four methods used in an electrical installation to provide basic protection (protection against direct contact)?

To adequately protect a cable from the heating effects of electric current, a fuse mustoperate within conventional time with a prescribed value of current. What is the value ofcurrent that ensures effective operation of a 20A fuse?

What are the requirements for protective devices installed for protection againstshort-circuit currents?

What is required of an earth leakage protective device when an earth leakage currentreaches a predetermined value?

What circuits within a domestic installation are required to be protected by an RCD and what is the maximum value of the trip current?

To limit the damaging effects of current on the human body, circuits shall be designed to be automatically disconnected from the supply if the touch voltage exceeds what value?

In general, what is the maximum permissible height that a main switch can be installed on a main switchboard?

In order to protect persons against injury from mechanical movement, motors shall have a switching device capable of performing which functions?

A switching device (functional switch) shall be installed within what distance from an open element cooking appliance?

A single phase circuit supplying socket outlets is protected by a type C, 20A circuit breaker.What is the maximum demand of the circuit?

Fault-loop impedance is considered to be made up of two components. What are the twocomponents?

A circuit with a load current of 14A is protected by a 16A, type C circuit breaker. What isthe minimum allowable current carrying capacity of the circuit cable?

How is the short-circuit current at the point of supply of an electrical installationdetermined?

When wiring Extra Low Voltage (ELV) systems, the source of supply shall be one of four possible supply systems. The four systems are?

A light switch is installed 1300mm above the floor in a household bathroom and located 500mm away from the edge of a bath without a fixed barrier. Which zone is the switch installed in, and what IP rating (if any) is the switch required to be rated at?

An effective M.E.N. earthing system enables automatic disconnect of supply in the event of a fault. List all the parts that make up a M.E.N. earthing system.

SECTION C - CALCULATIONS15 MARKS

(15 marks in total - the allocation of marks is shown against each question)

Show all working

Place your answer on the space provided on the answer sheet.

Determine the current required to instantaneously trip a 32A, type C circuit breaker. (1 mark)

With the assistance of Table 8.1, determine the current required to blow a 25A HRC fuse in 0.4 seconds. (2 marks)

A final sub-circuit is arranged in the following manner -

rated load current = 27A

circuit protection is a circuit breaker with a rating = 32A

current carrying capacity of circuit cable = 35A

(a) Does the circuit arrangement provide correct coordination of the load, protective device

and cable? Show working. (1 mark)

(b) Does the circuit arrangement provide adequate overload protection? Show working.(2 marks)

If the final sub-circuit as described in question 53 was protected by a fuse and not a circuit breaker, the circuit arrangement would be as follows:

rated load current = 27A

circuit protection is a fuse with a rating = 32A

current carrying capacity of circuit cable = 35A

(a) Does the circuit arrangement provide correct coordination of the load, protective device

and cable? Show working. (1 mark)

(b) Does the circuit arrangement provide adequate overload protection? Show working.(2 marks)

A non-air-conditioned warehouse has the following points wired and installed on a separate 2.5mm2power circuit.

3 double socket outlets.

2 single socket outlets.

Determine by calculation, the maximum demand for the circuit.(1 mark)

A final sub-circuit is wired using a 6mm2 twin and earth cable that incorporates a 2.5mm2 earthing conductor. To meet fault loop impedance requirements, what is the total maximum resistance the final sub-circuit can be if is protected by a 40A type D circuit breaker? (1 mark)

For the supply system shown in figure 1, determine -

rated secondary current of the transformer(1 mark)

fault current at the transformer secondary terminals(1 mark)

fault current at the main switchboard(1 mark)

fault current at the distribution board.(1 mark)

Supply transformer

Main switchboard

Distribution board

400/230V

500kVA

Z = 0.016

Consumer mains

Z = 0.004

Submain

Z = 0.03

Figure 1

SECTION D GRAPHICAL(15 marks in total)

(15 marks in total - the allocation of marks is shown against each question)

The answers to this part of the test are to be given on the separate answer sheet provided.

Using the arrangement shown in figure 2, draw the connections required to connect lightingcircuit 1, power circuit 1, the range and the hot water systems. (8 marks)

-495935127000

Figure 2

Figure 3 below shows a time/current curve for a thermal magnetic circuit breaker.

Which region of thecurve indicates the overload protection area, region, A or B?(1 mark)

What does the other area of the curve represent?(1 mark)

129540071755

Figure 3

If a 20A type C circuit breaker is overloaded with 60A, what would be the approximate minimum and maximum tripping times? Use figure 4 below.(2 marks)

Multiple of rated current.

Figure 4

The device shown in figure 5, has the following information on it: (3 marks total)

(a) the letter C

(b) the number 16

What does this information mean? (1 mark each)

1485900100965

Figure 5

*************** END OF EXAMINATION***************

SECTIONA35 MARKS

For each question in part A, identify the response you consider best answers the question by placing its identifying letter in the space provided on the separateanswer sheet.

1 MARK awarded for each correct answer.

The visible light spectrum is bordered by:

Infra-red and microwave radiation

Ultra-violet and X-ray radiation

Ultra-violet and infra-red radiation

Microwave and X-ray radiation

The colour of the light emitted by a High Pressure Sodium lamp is:

Golden white

Daylight

Warm white

Cool white

In reflection and refraction, the normal is:

The point where the light touches the surface

A line drawn perpendicular to the surface at the point of contact

A line drawn through the surface where the light touches the surface

The projected point where the image will be seen by the observer

With regard to refraction:

Light always bends toward the normal when it changes medium

Light always bends away from the normal when it changes medium

Light bends toward the normal when entering a more dense medium

Light bends away from the normal when entering a more dense medium

HID Mercury lamps produce visible light mainly in the:

Blue-white colour region

Blue-green colour region

Blue-red colour region

Blue-yellow colour region

The three primary colours of light for an electricain are:

Red, white and blue

Red, green and blue

Red, green and yellow

Red, blue and yellow

The metal halide HID lamp includes metal halides inside the arc tube to:

Give a longer lamp life

Reduce the overall size of the bulb

Reduce the restrike time

Improve the colour rendition

There are two basic types of fluorescent lamps. They are:

Compact and straight tube

Hot and cold cathode

Cool and warm tubes

Large and small diameter

Electronic ballasts typically work in the frequency range of:

1000 to 5000 Hz

2000 to 10000 Hz

25000 to 40000 Hz

10000 to 20000 Hz

The most efficious artificial lamp is:

The Low Pressure Mercury Lamp

The Low Pressure Sodium Lamp

The High Pressure Mercury Lamp

The High Pressure Sodium Lamp

With regard to emergency evacuation luminaries, a lamp which is on before and

during a mains failure is called a:

Maintained luminaire

Contained Luminaire

Sustained Luminaire

Retained Luminaire

v is the symbol for:

Luminous Intensity

Luminance

Luminous flux

Illuminance

The lumen is the unit of:

Luminous Intensity

Luminance

Luminous flux

Illuminance

I is the symbol for:

Luminous Intensity

Luminance

Luminous flux

Illuminance

The lux is the unit of:

Luminous Intensity

Luminance

Luminous flux

Illuminance

With regard to emergency evacuation luminaries, a fitting which has two independent

lamps, one for normal supply and the other for emergency supply is called a:

Maintained luminaire

Contained Luminaire

Sustained Luminaire

Retained Luminaire

The standard that governs emergency lighting is:

AS3000

AS2293

AS1680

AS3137

Appliances and motors installed above 2.3m in a domestic installation, may be included as a light point for the purpose of maximum demand, provided their power rating does not exceed:

150 W

250 W

100 W

50 W

A neon sign filled only with pure neon gas, will produce which colour light:

white

sky blue

ultra-violet

reddish orange

Fluorescent lamps create artificial light by means of:

Electroluminescence

Incandescence

Ionization

Phosphorescence

The material used for the filament of an incandescent lamp is:

Iron

Copper

Alnico

Tungsten

The light colour of an incandescent lamp is termed:

Warm

Hot

Daylight

Comfortable

The life of a standard GLS lamp as nominated by manufacturers is:

8000 hours

5000 hours

2000 hours

1000 hours

With regard to emergency evacuation luminaries, a fitting which is on only during a mains failure is called a:

Non-contained luminaire

Non-sustained Luminaire

Non-retained Luminaire

Non-maintained Luminaire

Linear halogen floodlights when positioned, are to be within:

4o of the horizontal

5o of the horizontal

30o of the horizontal

50o of the horizontal

The useful life of a T8 fluorescent lamp supplied with the correct value of voltage is nominated by manufacturers as being approximately:

1000 hours

2000 hours

8000 hours

20000 hours

The filament of the fluorescent lamp is made of tungsten and is coated with:

Emissive material

Mercury

Copper Sulphate

Carbon

A lighting system whereby only 80% of the source light is designed to reach the surface is classified as:

Direct lighting

Semi-direct lighting

Direct-indirect lighting

Semi-indirect lighting

The glare that is created when a light source is reflected into the field of vision of the observer is called:

Discomfort glare

Disability glare

Indirect glare

Direct glare

Two advantages of halogen capsule incandescent lamps over standard GLS lamps is:

Cost and lamp colour output

Lamp colour output and efficacy

Cost and ease of use

Ease of use and size

As a guide, using AS3000 how many 10A double socket outlets can be connected to a domestic final sub circuit protected by a 16A circuit breaker?

Which of the following circuits does NOT require RCD protection in a domestic installation?

Socket outlets

Lighting circuits

Directly connected hand held electrical equipment

Hot water system

When testing the voltage between phases of a multi-phase socket outlet, the nominal voltage should measure:

230V

460V

400V

Can a low voltage and extra low voltage wiring system be enclosed in a common wiring enclosure?

Yes, providing the cables are installed in a separate compartment of a common cable trunking system

Yes, providing a distance of 300mm exists inside the enclosure

Yes, providing the wiring system with the lower voltage value has triple insulation

A mixed circuit is wired using both 1.5mm2 and 2.5mm2 cables. The circuit protective device should be selected to protect:

the 1.5mm2 cable

the 2.5mm2 cable

the cross sectional area of both cables added together

a separate protective device should be used for each cable

SECTIONB25 marks

Blank spaces in the following statements represent missing words, phrases or quantities. Write the appropriate word, phrase or quantity in the spaces provided on the answer sheet.

The conductor installed between a light switch and the light fitting for the purpose of on and off control, is commonly referred to as the _____(36)_________.

When wiring light circuits, the method whereby the un-switched circuitconductors (usually

twin& earth) arewired in and out of all the switches first, is termed the ______(37)_______

method ofwiring.

When wiring 2-way or 3-way switching, is typical to wire a twin cable between the switches which is commonly referred to as ______ (38) _______.

When testing light circuits, the minimum insulation resistance should be ______(39)______.

To meet compliance, emergency lights which have been in service for 6 months or more, must maintain a lighting level of ___(40a)___ lux for a period of ___(40b)___ minutes. (2 marks)

There are 2 types of battery systems used to maintain supply to emergency lighting and exit signs in the event of power failure. They are ____(41a)_____ systems, or _____(41b)_____ systems. (2 marks)

Public venues such as theatres are required to have a ____(42)______ switch installed in main entry areas so emergency personnel can control emergency lighting from a single point.

When connecting wiring to an Edison screw luminaire, the ____(43)____ conductor must be connected to the outer contact (the threaded part of the base).

The resistance of a hot cathode fluorescenttube ____ (44)_____ as it gets hotter.

The device used to limit the inrush current in a florescent circuit is a _____(45)______.

Light Emitting Diodes (LEDs) are polarized, meaning they must be connected with the correct ______ (46) _______.

Neon lighting is a ____ (47) ____ cathode lighting system.

High Intensity Discharge (HID) lamps have a _____ (48) _____ time, meaning they will not come straight back on after momentary loss of power.

When testing the insulation resistance of single phase socket outlet circuits, the meter would be set to ___(49a)____ and the reading expected should not be less than___(49b)___ (2 Marks)

Generally, single load items with a current carrying capacity exceeding _(50)__ amps, should be connected to a separate circuit and not to a mixed circuit.

When installing circuits using TPS cables, such as socket outlet and lighting circuits, suitable fixing devices shall be installed at a distance that prevents __(51)_____ of cables.

Is it permissible to install low voltage power cables and telecommunication cables in the same section of a skirting duct?

A 2.5mm2single phase circuit supplying double socket outlets in a non-air-conditioned office is protected by a 20A circuit breaker. What is the recommended maximum number of double socket outlets that can be installed on the circuit?

A single phase mixed circuit is installed using both 2.5mm2 and 4mm2 TPS cables. The cables are installed unenclosed andcompletely surrounded in thermal insulation. What is the maximum rating of a circuit breaker that may be used to protect the circuit?

How many 15A multiphase socket outlets can be installed using 4 mm2 cable installed in air (not enclosed in conduit), if the circuit is protected by a 32A circuit breaker. The outlets are for general use only

Indicate the polarity of the socket outlet in figure 2 below.Include the AS/NZS3000 reference.

(2 marks)

-80010162560

(a)

(b)

(c)

Figure 2AS/NZS 3000 Reference: ___________

SECTION C 10 MARKS (2 marks each)

Using the AS/NZS 3000:2007 Wiring rules, answer the following questions in the space provided. On the answer sheet, write down the clause number and the information asked for in each question.

You will obtain full marks for having:

The correct answer

The relevant clause or table number

Which AS / NZS 3000 clause specifically addresses rules for LIGHTING EQUIPMENT AND ACCESSORIES?