ENPRA 101A Engineering Practice
ENPRA
101A Engineering Practice Link
http://electricaldiploma2013.zoomshare.com/files/ENPRA_101A_Engineering_Practice.htm
Moodle Link--- Click HERE
Wk1-Gen & dist of elect energy
Notes
Electrical
Distribution Lessons
VIDEOS
Lesson 1-Distribution system.zip
G015(AA)Lesson 2-Demand factor.zip
TEXTBOOKS
|
G006 |
Wk2-Rgulatory system
REFERENCES
Code of Professional Conduct
All individuals registered as
Professional Engineers and those aspiring to become registered Professional
Engineers shall deliver services in accordance with the Societys Code of
Professional Conduct and shall: 4
1. Competence
a) only
undertake professional tasks for which they are competent and will at all times
exercise all reasonable professional skill and care to prevent avoidable danger
to health or safety and the creation of adverse impacts on the environment.
b) maintain
and broaden their knowledge, experience and competence and encourage others to
do so.
2.
Integrity
a) treat all
persons fairly with respect and without bias
b) avoid where
possible real or perceived conflict of interest and advise affected parties
should such conflicts arise.
c) observe the
proper duties of confidentiality owed to appropriate parties.
d) discharge
their professional duties with integrity, impartiality and objectivity and have
no involvement with any form of bribery.
3.
Responsibility
a) accept
appropriate responsibility for work carried out under their supervision.
b) assess
relevant risks and liability and, if appropriate, have in force appropriate
liability insurances.
c) notify the
Society within 28 days:
if convicted of a
criminal offence other than parking fines or convictions for exceeding the
speed limit:
upon becoming bankrupt or disqualified as a Company Director:
if they are removed from
the membership of another professional body as the result of a matter relating
to conduct.
d) notify the
Society of any significant violation of the Code of Conduct by any Professional
Engineer on the register or any aspiring member seeking to gain access to the
register.
4.
Information
a) co-operate
with the Society and provide such information as may be requested to facilitate
any investigation into the conduct of any Professional Engineer on the register
or any aspiring member seeking to gain access to the register. 5
5. Relationships
a) have due
regard to their duty of care to clients and not take advantage of any client or
potential client for whatever cause or reason in obtaining and carrying out
instructions.
b) put all
terms of engagement in writing and state the fees to be charged; whenever
practicable, these should be issued to the client before a project is begun.
c) inform
his/her client immediately if it appears that his/her estimate as to the total
fees to be charged is likely to be or will be exceeded.
d) take care
not to mislead a client as to the range of services that a quoted fee is
intended to cover and the amount of future fees which may be involved. Note in
respect of relationships: Any Professional Engineer on the register or any
aspiring member seeking to gain access to the register shall not:
accept a professional
assignment if he/she is aware or has reasonable cause to suspect that another
member is acting for the client in respect of the same assignment, until either
the first contract has been determined by the client, or the other member has
consented to him acting.
induce a client to agree
to pay sums of money which are not justified by reference to the work which the
member has carried out or has been instructed to carry out.
offer or give any fee,
commission, discount or other inducement (financial or otherwise) to a third
party in return for the introduction of clients or particular professional
assignments unless, before entering into a legally binding agreement
with that
client he/she makes full disclosure to the relevant client of the nature or
amount of such fee, commission, discount or inducement and the name of the
person or persons to whom such fee, commission, discount or inducement was
offered or given.
6. Practice
a) Ensure that
in respect of any firm in which he/she is or is held out to be a sole
proprietor, partner or a director or through which he/she practises or conducts
business:
the composition (list of
partners or directors) is clearly stated on all appropriate documentation and
that where there has been a material alteration to the composition, all clients
of the firm or company are notified of the change promptly;
6
the style or title does
not adversely reflect upon his/her professional status as a Professional
Engineer and the dignity and reputation of the engineering profession;
the name is not
misleading or liable to cause confusion with the public, nor does it imply any
partnership arrangement
in the name of any partnership in which
such member practises provided all the members partners are similarly entitled
to use the Title and designatory letters
to describe the name of any company
provided only that all the shareholders and/or members of such company and all
the directors of such company are similarly entitled to use the Title.
to describe the name of a firm or
business which is not a partnership or company in which he/she practises
provided such use of the Title does not give the impression that any other
person or persons with whom such member is carrying on business or whom such
member employs or with whom such member is associated in any way is entitled to
use the same Relevant Title or, if the impression referred to is given, such
other person or persons is or are similarly entitled to use the Title.
7. Managerial responsibility
a)
In addition to the responsibilities referred to in the Rules of Professional
Conduct, but subject to the following, any Professional Engineer on the
register or any aspiring member seeking to gain access to the register shall be
prima facie responsible, as a matter of professional conduct, for the acts or
omissions including, in particular, breach of any of the provisions of the
Articles and Bye-Laws of the Society or these Rules of Professional Conduct of:
any firm in which the member is, or
holds him/herself out to be, or allows him/herself to be held out as a partner,
or any firm which the member allows to use his/her name and/or style and title
or designatory letters in any of its advertisements, publicity material or
notepaper; and
7
any company of which he/she is a director or any
co-director of that company or any company which the member allows to use
his/her name and/or style and title or designatory letters in any of its
advertisements, publicity material or notepaper.
b) If any
Professional Engineer on the register or any aspiring member seeking to gain
access to the register is able to show that, without default on his/her part,
he/she was not aware, and there was no reason for him to be aware at the time
of any breach of these provisions by any firm or company referred to above and
he/she had, prior to the breach, taken all reasonable steps to ensure that such
a breach would not occur, then he/she shall not be in breach of this Rule.
8 Publicity and Advertising
a) Any
Professional Engineer on the register or any aspiring member seeking to gain
access to the register may publicise his/her services or permit another person
to do so, but in doing so the member must have due regard to the standards set
by the Advertising Standards Authority and any standards set by any other
regulatory or governmental authority in relation to advertising and ensure that
any publicity for which he/she is in any way responsible is neither inaccurate
nor misleading.
b) In all
advertising, publicity material or public statements for which any Professional
Engineer on the register or any aspiring member seeking to gain access to the
register is in any way responsible, he/she shall avoid all claims of
superiority over, or critical comparisons of, the services provided by other
engineers and shall avoid any direct comparison of fees and charges levied by
other engineers.
c) Any
Professional Engineer on the register or any aspiring member seeking to gain
access to the register may only refer to the name of a client in any
advertising, publicity material or public statement if the prior written consent
of that client is first obtained.
d)
Advertisements or other publicity material issued by any Professional Engineer
on the register or any aspiring member seeking to gain access to the register
or by a firm in which they are held out to be a partner or director or a
company through which they practise or conducts their business may state
(subject to compliance with any other relevant regulations or legal
requirements) either expressly or implied that they, the firm or the company
(as the case may be) offers expertise or specialist advice in relation to a
particular field of engineering provided only that this is the case. 8
ASSIGNMENT
From newspaper, journal, internet, online chatting groups, show one event that signify the breach of engineering ethics such as use of substandard materials, breach of safety law, breach of fair practice, attempt to monopolizing , use of law and authority for safeguarding own benefits or personal associates , depressing others and highlight how engineering ethics are breached.
Wk3-Control+Protection
Wk4-Control+Protection
NOTES
G033+G063+G107
(Week 1 to 6 Lessons)(G033)
TEXTBOOKS
|
G063 |
Electrical EquipmentsSafety Protection |
ConstructionElectricalSafety.pdf
Electrical Safe Working Ultimo.pdf
Wk5-Drawing & speci
NOTES
TEXTBOOKS
|
EE107 |
Basic
Electrical Drafting |
E107
CAD Drafting+
Computerized Electronic Circuit Development
CAD
CAE CAM Textbooks
To be copied from USB
Engg Softwares
To be copied from USB
Wk6-Fasteners
Notes
Electrical Workshop Wiring Mod
Videos
Electrical
workshop
E001+002+005+008+033/
E101+102+105+108+137+G106
Page 128 to 136 of http://www.filefactory.com/file/cf9bf8f/n/Video_Lessons.pdf
www.highlightcomputer.com/Video Lessons.pdf
Electrical workshop Lesson 1 OHS.zip
(E101)
Electrical workshop Lesson 2 Workplace hazard+Fix &
secure equipment.zip
(E102)
Electrical workshop Lesson 3 Mechanical
fixing.zip
(E105)
Electrical workshop Lesson 4 Basic electrical wiring.zip
(E108)
Electrical workshop Lesson 5 Wiring circuits.zip
(E107)
SUNP0007
Electrical workshop Lesson 6 Electrical
safety testing.zip
(E137)
Electrical workshop Lesson 7 Testing
insulation and polarity.zip
(E137)
Electrical workshop Lesson 8 Testing
lighting polarity.zip
(E137)
The links contain the following lessons
Electrical workshop Lesson 1 OHS
Electrical workshop Lesson 2 Workplace hazard+Fix &
secure equipment
Electrical workshop Lesson 3 Mechanical fixing
Electrical workshop Lesson 4 Basic electrical wiring
Electrical workshop Lesson 5 Wiring circuits
Electrical workshop Lesson 6 Electrical safety testing
Electrical workshop Lesson 7 Testing insulation and polarity
Electrical workshop Lesson 8 Testing lighting polarity
Wk8-Wiring syst
Wk9-Wiring syst
Practical Videos
Data Cabling
Dimmer Light Installation
Install Sub Panel
Installing EMT+MC Cable
Installing Feeder Wire from
main busbar
Main Switch Board & Socket outlet Installation
Pulling Cable
Switchboard Circuit Breaker
Installation
UG Conduit Installation
Use fish tape to pull the
cable
Wiring Trunking Assembly
LESSON
VIDEO-ENGLISH
Electrical workshop
E001+002+005+008+033/
E101+102+105+108+137+G106
Page 128 to 136 of http://www.filefactory.com/file/cf9bf8f/n/Video_Lessons.pdf
www.highlightcomputer.com/Video Lessons.pdf
Electrical workshop Lesson 1 OHS.zip
(E101)
Electrical
workshop Lesson 2 Workplace hazard+Fix &
secure equipment.zip
(E102)
Electrical workshop Lesson 3 Mechanical fixing.zip
(E105)
Electrical
workshop Lesson 4 Basic electrical wiring.zip
(E108)
Electrical
workshop Lesson 5 Wiring circuits.zip
(E107)
SUNP0007
Electrical workshop Lesson 6 Electrical safety
testing.zip
(E137)
Electrical workshop Lesson 7 Testing insulation and
polarity.zip
(E137)
Electrical workshop Lesson 8 Testing lighting
polarity.zip
Advanced Electrical Wiring
G003+G004+G007+
G103+G104+G033+G063
Page 149 to 163 of http://www.filefactory.com/file/cf9bf8f/n/Video_Lessons.pdf
www.highlightcomputer.com/Video Lessons.pdf
Electrical wiring + Electrical Installation requirement
G003+G004+G007 Lesson 1 Electrical installation
protection.zip
(G063)
G003+G004+G007 Lesson 2 Electrical system safety.zip
(G063)
G003+G004+G007 Lesson 3 Heating+Cable ckt protection exercise.zip
(G063)
G003+G004+G007 Lesson 4 Wiring system.zip
(G033)
G003+G004+G007 Lesson 5 Hazardous area electrical
system.zip
(G033)
G003+G004+G007 Lesson 6 Overload protection RCD.zip
(G063)
G003+G004+G007 Lesson 7 RCD + Metering.zip
(G063)
G003+G004+G007 Lesson 8 Switch board installation.zip
(G033)
G003+G004+G007 Lesson 9 Cable selection+Maximum demand.zip
(G033)
G003+G004+G007 Lesson 10 Electrical installation safety
testing.zip
Electrical Installation
G007+G107
Page 164 to 182 of http://www.filefactory.com/file/cf9bf8f/n/Video_Lessons.pdf
www.highlightcomputer.com/Video Lessons.pdf
Electrical Installation requirement
G007
G007 Lesson 1 AS3000 Wiring rule overview.zip
G007 Lesson 2 Maximum Demand calculation.zip
G007 Lesson 3 Cable selection.zip
G007 Lesson 4 Cable voltage drop calculation.zip
G007 Lesson 5 Derating of cable part 1.zip
G007 Lesson 6 Derating of cable part 2.zip
G007 Lesson 7 Derating of cable for HRC fuse
protection.zip
G007 Lesson 8 Final subcircuit fault loop impedance.zip
ADVANCED WIRING CLASS LESSONS
G033+G063+G107 (Week 1 to 6 Lessons)(G033)
G106 Cable Termination (UG Cable)
TEXTBOOKS
|
33 |
Electrical
Installation Design |
|
G033 |
Advanced
Electrical Wiring |
|
G063 |
Electrical Equipments |
Wk10-Illumination
Wk11-illumination
Wk12-Emergency Syst
Wk13-Emergency Syst
VIDEOS
K041 Lesson 16-Energy
efficiency+Lighting.zip
K041 Lesson 17-Illumination+Smoke alarm.zip
Electrical Project Practice
+ Building Service Electrical & Mechanical Engineering
Electrical Project Practice
Building
Service Engineering Textbook
Building
Service Electrical& Mechanical Engineering
Electrical Wiring Practice
Cable selection Page 8,9,12,15,20,
Circuit Protection Page 11,12,17,21,33,
34
e-accessories Page
31,34,35,36,38,39,41,45
e-cable
Page 170,171,140,150,155
Earthing Page 3, 6, 7, 8, 9
Architecture e-book
Gas installation Page
350,351,353,354,355,356,357,359,360,361,363,374,376,378
Design of Electrical Service for
Buildings
Cable Page 46,47
Wiring Page 53,54,55,
Cable rating Page 82,84,85
Circuits Page 90,93,95
Distribution Page
97,99,101,103,106,110,111,112
Lighting Page 119,
Emergency Page 134
Protection RCD Page 150,
Fuse Page 145
Circuit Breaker Page 147
Earth Leakage Page 165, 166, 169
Fire Alarm Page 174, 176,186,
Lightning Protection Page 225
Emergency Supply Page 241
Lift Page 253,254,257,258,260,262,263
TV Page 202,204,212,216,218,219,221
Refrigeration& Air-conditioning
Refrigeration cycle Page 14,15,16,18,22,23,25,28,31,39
Compressor/ Motor 46
Condenser / water tower Page 64,66, 68, 71, 72
Evaporator Page 84, 87, 88
Expansion valve Page
94,95,96,99,101,102
Control Page
104,105,107,110,112,114,118
Systems Page
147,152,155,158,179,184,185
Load estimate Page 214, 215, 245
Air Page 278, 288, 290, 292, 297, 298,
301, 302, 303, 304, 307, 311, 317
Heat Pump Page 320
Control Page 324, 328, 331
Commissioning Page 334
Building Service Electrical.doc
Building Electrical and Mechanical System Part 1.pdf
Building Electrical and Mechanical System Part 2.pdf
ENGINEERING PRACTICE EXERCISES
Click HERE to download the Exercises
7 Electrical Workshop UEENEEE001B+E002B +E003B+E004B+E005B+E007B+E008B+E033B+E038B
8 UEENEEG001B+UEENEEG002B UEENEEG101A+G102A Page 82
9 UEENEEG003B+UEENEEG004B+UEENEEG007B Part UEENEEG106A+G033A+G063A Page 92
10 UEENEEG003B+UEENEEG004B+UEENEEG007B Part 2
UEENEEG103A+G104A Page 100
Electrical Workshop Wiring Mod
G003+G004+G007
(1)Basic wiring circuits + wiring rules
Slide 1
Q1.What are the required topics of background study and electrical wiring rule study for selecting and arranging the equipments for electrical installations?
Slide 2
Q2.Sketch basic wiring circuit to control one switch and light.
Slide 3+4+5
Q3.Sketch a circuit for one switch and socket outlet.
Slide 6
Q4.Sketch light control circuit by timer circuit
Slide 7
Q5.Sketch light dimmer circuit.
Slide 8
Q6.Sketch the typical switch and label the components.
-----------------------------------------------------------------------------------------------------------------------------
(2) Water heaters, switch board wiring, RCD
Slide 1
Q7.What are the special features to be considered for water heater, cooking appliances and motors.
Slide 2+3
Q8.Write an important requirements to install a switch board and main switch board.
Slide 4
Q9.What are the prohibited and restricted locations to install switch board?
Slide 5+6+7+8
Q10.How is the switch board having the exposed live parts installed?
Q11.Describe the switchboard wiring
Slide 9
Q12.Sketch the protective earthing system.
Slide 10
Q13.How can the circuit protection be provided?
Slide 11
Q14.Sketch RCD connection diagram and express the types of RCDs.
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(3) Earthing+ Wiring system+ safety test.
Slide 1
Q15.Sketch the earthing arrangement diagram. And perform the wiring rule practice provided in the service.
Slide 2
Q16.Sketch the arrangement of earth bar, neutral link and RCD on main switch board.
Slide 3
Q17.Sketch the electrical installation planning for one switch diagram consisting of main switch board, neutral link, earth link and branch circuits.
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(4) Cable installation
Slide 1+2
Q18.Describe the usage & limitation of TPS wiring system.
Slide 3
Q19.Describe the safety testing procedures before connection to supply.
Slide 4
Q20.Sketch the installation of circular TPS cable on a cable tray.
Slide 5
Q21. Compare ladder & tray.
Slide 6
Q22.What are affecting the actual capacity of cable?
Q23.What are the installation requirement , cable support and weather proof?
Slide 7
Q24.Describe the types of conduits.
Slide 8+9
Q25.What are the installation requirements for conduit?
Slide 10
Q26.Describe the general features of wiring system?
Slide 11+12
Q27.Explain the selection of a suitable wiring system.
Slide 13+14
Q28.Explain (a) pen wiring (b) Aerial wire (c) Catenary support.
Slide 15
Q29.Explain trunking system with sketch.
Slide 16+17+18
Q30.Explain cable trays and ladders with sketches.
Slide 19
Q31.Perform wiring rule practices for the tasks given in slides.
Q32.Explain underground wiring system with sketches.
Slide 20+21+22
Q33.What is category A system? Perform wiring rule practices for the tasks given in slides.
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(5) Earth fault, Hazard area
Slide 1
Q34.What are the types of earth fault, supply system fault and factors influencing earth fault currents.
Q35.Sketch the installation of earthing system.
Slide 2
Q36.Sketch ELCB system.
Q37.What is MEN system?
Slide 3
Q38.Perform the wiring rule practice tasks described in the slide.
Slide 4+5+6
Q39.What are the causes of earth fault? Perform the wiring rule practice tasks described in the slide.
Q40
Short circuit frame to resistance fault 3 ohm. Resistance of return earth loop = 15 ohm.
Find the earth fault current in above diagram.
Slide 7
Q41.Sketch the installation of earthing system and write the supplementary system of earth protection.
Q42.How can you isolate live parts?
Slide 8
Q43.What is the meaning of hazardous area and describe types of them.
Slide 9
Q44.What are the types and methods of explosion protection?
Slide 10
Q45.Perform the wiring rule practice described in the slides.
Q46.What are the kinds of equipments and wiring systems that are not permitted in hazardous area?
Slide 11+12
Q48.Sketch the fault current diagram with fuse.
Q49.Perform the performing rule practice described in the slide.
Slide 14+15
Q50.What are the important aspects of electrical installation safety & employees responsibility?
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(6) Protection mechanism
Slide 1
Q51.What are the protection mechanism?
Q52.Explain fault current limiters and surge diverters
Slide 2
Q53. How can the switching transient be protected?
Slide 3
Q54.Describe the motor protection methods.
Q55.Sketch the layout of switch board.
Slide 3+4+5
Q56.Describe the switch board installation methods for non domestic electrical installations.
Slide 6
Q57.Perform electrical wiring rule practices described in the slide.
Slide 7+8+9
Q58.Determine the maximum demand of the heaviest loaded phase in a domestic electrical installation comprising
36 lighting points
24 x 10A single socket outlet
2 x 15 A socket outlet
2 x 6.6 KW range
1 x 4 Kw air con unit
1 x 15 kw instantaneous water heater.
3x 5 kw hot plate
|
Red |
White |
Blue |
|
2x 15 A socket outlet 5 kw hotplate x 1 4 kw air con x 1 5kw water heater |
10 A socket outlet 5 kw hot plate 5 kw water heater 3.6 kw cloth dryer |
36 lights 9 x 10A socket outlet 2 x 6.6 kw oven 5 kw water heater. |
Slide 10+11
Q59.Determine the maximum demand of the heaviest loaded phase of a block of 85 units comprising the following loads.
Lighting 85 units
10 A socket outlet = 85 units
Electric range = 17 units
3 KW (13A) permanent strip heater 85 units.
Quick recovery heater- 85 units.
Loading not associated
100 x 60 w lighting points
24 x 100 w lighting point
(Total lighting 8.4 KW)
21 x 10A single socket outlet
12 x 3.6 kw cloth dryer
3 x 12 kw lift motor
1x 5.5 kw three phase pump motor
1x 3 kw three phase water supply motor
Slide 12
Q60.Sketch the circuit diagram for installation & RCD testing
Slide 13+14+15+16+17
Q61.Explain energy demand metering with sketch.
Slide 18
Q62.What are the installation arrangement for RCD protection.
Slide 18+19
Q63.What are the level of protection required by regulations?
Slide 19+20
Q64.Sketch RCD and explain its operation
Slide 21
Q65.Classify RCD
Slide 22+23+25+26
Q66.Sketch typical installation circuit arrangement.
Slide 24.
Q67.Sketch KWH meter connection for hot water lighting and power.
Slide 27
Q68.Sketch the water heater with twin heat element.
Q69.What are the automatic control methods for hot water system.
Q70.What are the classifications of water heater?
Slide 28+29
Q71.Sketch thermostat connection for hot water heater.
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(7) RCD+ Cable selection
Slide 1+2+3+4+5
Q72.Determine the voltage drop for three phase separate final sub circuit and indicate if each result is within SAA limitation. Permissible voltage drop is 15V. Assume all cables are operating at their normal temperature.
(a) 30 mm2 copper V75 TPI cable in conduit 35 m 8 amp.
(b) 3 mm2 copper V75 SDI cable unenclosed and spaced apart 50 m 30 A.
(c) 8 mm2 copper XHF 110 multi-core cable on cable tray 20 m 100 amp.
(d) 15 mm2 copper multi-core MIMS cable Pf = 1 5 m 500 amp
(e) 150mm2 copper single core MIMS cable 5 m 500 amp
(f) 75mm2 aluminium multicore X-90 cable on cable tray 220 m 190 amp
G003+G004+G007 Part 2
(1)Cable selection
Slide 1+2
Q1.Write the steps to select cable.
Slide 3+4+5+6
Q2.Draw the cable selection and installation process.
Slide 7 to 15
Q3.Do the exercises for slide 7+8
Slide 15+16+17
Q4.Determine the voltage drop for each 3 phase separate final circuit. Permissible voltage drop is 16V. Assume that all cables are operating at normal voltage.
(a) 30mm2 copper V75 TPI cable in conduit 40m , 80A
(b) 3mm2 copper V75 SDI cable unenclosed and spaced apart
(c) 15mm2 copper X-HF 110 multicore cable on cable tray 20m , 90A
(d) 12mm2 copper multicore MIMS cable PF 1 , 35m ,60A
(e) 180mm2 single core MIMS cable 4m, 500A.
(f) 85mm2 Aluminium multicore X-90 cable on cable tray 150m , 200A
(g) 3mm2 copper V75 TPS multicore cable in conduit 25m 20A
(h) 2mm2 V90 multicore cable in UG conduit 75m 10A
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(2)Derating factor
Slide 1
Q5.Sketch the block diagram to derate the cable
Slide 2+3
Q6.The maximum demand current of the consumer in a non domestic installation is calculated to be 350A. The selected cable is 4 core non armoured V90 , insulated & sheathed , circular cable with copper conductors . The selected cable is 4 core non armoured V90 insulated & sheathed , circular cable with copper conductors installation of the cable places it clipped directly to un-internal wall open to air & protected binstallation is calculated y CB.
Slide 7+8
Q7.The maximum demand current of the submain in a non domestic installation is calculated to be 150A. The selected cable is 4 cores non armoured V90 insulated and sheathed with copper conductors. Installation of the cable places it clipped directly to an internal wall with 4 other circuits. All touching open to air & protected by CB.
Slide 9
Q8.The maximum demand current of a submain in a non domestic installation is calculated to be 100A. The selected cable is 4 wire non armoured V90 insulated and sheathed, circular cable with copper conductors. Insulation of the cable tray with other circuits . All touching . The cable tray is suspended 350mm from ceiling open touching & the circuit is protected by CB.
Slide 10
Q9.4 circuits consisting of 3 cores V90 circular non armoured & sheathed copper conductor cables are bunched together in closed throughing . The throughing is fixed to an internal wall in air horizontal position open air . Each circuit is to carry 60A when protected by CB.
Slide 11
Q10.Three circuits 4 cores of HF 90 TPI circular thermoplastic insulated sheathed non armoured copper conductor cables are buried directly in ground at depth 0.7m where ambient soil temperature of 25°C. The cables are spaced at a distance of 170mm from one another . Each circuit is to carry 130A when protected by CB.
Slide 12+13
Q11. 4 circuits consisting of 3 cores V90 circular non armoured insulated and sheathed copper conductor cables are buried together in closed throughing . The throughing is fixed to internal wall into air . Horizontal position is open to air. Each circuit is to carry 64A when protected by CB.
Slide 14
Q12.A single circuit consisting of 3 single core V90 insulated unsheathed non armoured TPI copper conductor cable enclosed in rigid thermo plastic conduit which is buried in the ground at depth 1.3 m in an ambient soil temperature 25°C. The circuit is to carry 180A when protected by CB.
Slide 15.
Q13.A factory installation by 3 phase 415V supply where by a multiple section installation . The maximum demand is 200A/ph. 3 single core non armoured V90 installed & sheathed circular cable with copper conductors. Installation in rigid thermoplastic conduit buried in ground at soil temperature 28°C. Cables are protected by CB. Calculate maximum conductor size and neutral.
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(3) Final subcircuit + Fault loop impedance+RCD
Slide 1
Q14.A final subcircuit supplies a load consisting of a range in domestic installation & is protected by 32A CB . Determine maximum internal fault loop impedance of final subcircuit based on 230V
Slide 2
Q15.A final subcircuit supplies a load consisting of 25A outlet and protected by 25A HRC fuse. Determine the maximum fault loop impedance of final subcircuit & based on 230V.
Slide 3
Q16.A final subcircuit supplies a load consisting of fluorescent lamp and it is protected by a 10A type (C)Circuit breaker . Determine maximum internal fault loop impedance of final subcircuit based on 230V.
Slide 4
Q17.Explain the operation of RCD.
Slide 5
Q18.Classify RCD.
Q19.What are the requirements of RCD?
Q20.Determine the installation arrangements of RCD
Q21.What are the causes of nuisance tripping?
Slide 6
Q22.Explain damp situation.
Slide 7
Q23.Sketch RCD, protected neutral, unprotected neutral.
Slide 8
Q24.Explain the requirements for installation & earthing
Slide 9+10
Q25.Outline safety testing procedures.
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(4)Circuit testing
Slide 1
Q26.What are to be included in test on installation?
Slide 2
Q27.What are the responsibilities of inspection?
Slide 3
Q28.What are the types of test equipments?
Slide 4+5
Q29.Explain visual examination procedures in circuit checking.
Slide 6
Q30.Explain construction site testing.
Slide 13
Q31.Describe the frequency of inspection and test of all electrical equipments other than fixed equipments.
Slide 14+15
Q32.Describe the earth continuity & resistance testing with sketch.
Slide 16
Q33.What are the required items to be earthed?
Slide 17+18
Q34.Explain insulation resistance testing procedure.
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(5)Circuit testing (2)
Slide 1 to 5
Q35.Explain polarity testing.
Slide 6
Q36.
Explain polarity testing of sub-main with sketch.
Slide 7+8+9
Q37.Explain transposition testing with sketch.
Slide 10+11+12
Q38.Explain short circuit testing with sketch.
Slide 13+14+15+16
Q39.Explain interconnection testing with sketch.
G007
(1) Scope + Maximum demand
Slide 1+2
Q1.Express the overview of AS 3000:2007
Slide 3
Q2.Mention the AS 3000:2007 clauses for underground wiring system.
Slide 4
Q3.Sketch catenary system and earthing system.
Slide 5
Q4.Explain the selection and installation of appliances & accessories.
Slide 6+7+8
Q5.Determine the maximum demand of a single domestic electrical installation supplied at single phase with the following loads.
30A lighting points.
15 m lighting track.
8 10A single outlet.
10-10A double socket outlet.
1 x 60 w exhaust fan.
1 x 15A socket outlet.
1x 2000w strip heater
1x 15 KW range
1 x 5 KW water heater.
1 x 4 KW tennis court lighting
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(2) Maximum demand for three phase system.
Slide 1+2+3
Q6.Perform the practice task for the problem in slide 1+2+3
(3) Maximum demand calculation
Slide 1+2+3+4
Q7.Determine the maximum demand of the heaviest loaded phase of a 90 units comprising the following loads.
Lighting 90 units
10A socket outlet= 90 units
Electric range = 20 units.
2.5 KW (10.4 amp) permanent strip heater = 90 units. Quick recovery water heater = 90 units.
Loading not associated
100 x 60 w lighting points
21 x 100 w lighting points.
20 x 10 A single socket outlet
10 x 4 kw cloth dryer
1 x 5.5 kw three phase pumps
1 x 5 kw three phase water supply motor
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(4) Cable selection
Slide 1 to 6
Q8.Calculate the voltage drop in each segment of a three phase 400V non domestic installation consisting of the followings.
Consumer main
Three phase maximum demand 50A route length 30m cable size 25mm2
Cable configuration- V90 single core thermoplastic and sheathed copper conductors.
Cable Installation
The circuit is enclosed in heavy duty rigid thermoplastic conduit with no other circuits. Conduit is buried in the ground having an ambient soil temperature 25 °C and top cover 0.7m
Sub main
Three phase maximum demand 45 A , route length 45 m cable size 25mm 2
Cable configuration
V90 single core thermoplastic & sheathed copper conductors structure in trefoil formation and installed in single circuit configuration. Unenclosed in air.
Final sub circuit
! phase maximum demand 30A route length 40 m cable size 5mm2
Cable configuration V90 two cores and earthed thermoplastic and sheathed copper conductors.
Cable installation
The cables are clipped to the building structure and installed in single conduit configuration . Un-enclosed in air.
Does this portion of the installation comply with voltage drop requirement of AS/NZS 3000?
Slide 7+8+9+10+11
Q9.Perform the practice tasks on slide 10+11+12
---------------------------------------------------------------------------------------------------------------------------------(5)Three phase voltage drop
Slide 1+2+3
Q10. Perform the profile task on slide 1+2+3
Slide 4+5+6
Q11.Calculate voltage drop for a circuit in factory supplying two 15 A socket outlet route 50m protected by 25A CB V 75 TPI cable that is enclosed in air.
Q12.A 50 A three phase boiler is wired using 15 mm V75 TPI cables installed in rigid PVC conduit . The boiler is suited at 70 m from the switch board.
Q13.Six 240V 2000W flood lights outside a factory on a circuit protected by a 32A CB . Circuit cables are V 75 TPI installed enclosed in air route length 76m.
Q14.Two single phase socket outlets installed on a circuit with route length 60 m protected by 32A CB V75 TPI enclosed in air non domestic installation.
-----------------------------------------------------------------------------------------------------------------------------------(6) Questions and answers part 1
Slide 1 to 10
Q15.Perform the practice task on questions and answers in slide 1 to 10.
(7) Questions and answers part 2
Slide 1 to 14
Q16.Perform the practice tasks on questions and answers in slide 1 to 14.
G008+G009
(1)AC MACHINE
Slide 1+2+3
Q1.Explain operating principle of AC machine.
Slide 4+5
Q2.Explain operation principle of single phase AC motor
Slide 6
Q3.Sketch universal series motor.
Slide 7
Q4.Sketch the shaded pole motor and explain its operation.
Slide 8
Q5.How will you reverse (a) Three phase motor )b) Single phase motor.
Slide 9+10
Q6.What are the common faults in motor.
Q7.What are the requirements for motor control equipments?
Slide 11+12
Q8.Sketch DOL starter & explain operation.
Q9.Sketch Star/Delta starter & explain its operation.
(2) AC Motor control
Slide 1
Q10.Sketch auto transformer starter.
Slide 2
Q11.Sketch primary resistance starter.
Slide 3
Q12.Sketch star / delta starter load characteristics
Slide 4
Q13.Sketch electronic soft start starter.
Slide 5
Q14.Sketch secondary resistance starter.
Slide 6+7
Q15.Explain three phase motor braking method?
Slide 8 to 13
Q16.Explain Plugging?
Slide 9 to 13
Q17.Explain Dynamic braking with sketches.
Slide 14+16
Q18.Explain controlled rectifier , inverter with sketch
Slide 15+17
Q19.Explain motor slip control
Slide 18
Q20.List motor protection systems
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(3) Synchronous Machine+ DC Machine + Transformer
Page 1 to 7 Synchronous machine. Do the exercises (Q 1 to 6) on page 6
Page 8 to 15 DC Machine .Do the exercises on page 12 & 13
Page 16 to 32 Transformer. Do the exercises on page 20 & 31