EL03 Control and Protection (PDF)

EL03 CONTROL AND PROTECTION UEEEL0003 Arrange circuits, control and protection for electrical installations 2 RESOURCES Moodle Course Access (UEE30820) You should already be enrolled in the Moodle UEE30820 course page. If not, your teacher will provide an enrolment key to access...

EL03 CONTROL AND PROTECTION UEEEL0003 Arrange circuits, control and protection for electrical installations 2 RESOURCES Moodle Course Access (UEE30820) You should already be enrolled in the Moodle UEE30820 course page. If not, your teacher will provide an enrolment key to access The Course Inductions must be completed on initial enrolment. After completing them, you will have access to all resources Your teacher will take you through the resources and links to ensure you have access to everything required for your course TAFE NSW 3 RESOURCES Moodle Unit Access (CO23) Unit CO23 is a 4 year Unit, that requires progress reporting by you on your competency development. You have (should have) already completed the Knowledge Test and first skills assessment in Stage 1.1 already. If these have not been completed, you should book into tutorial to complete these ASAP You are required to complete a Progress Report every Semester. Your teacher will advise / remind you of this obligation. You need to retain these and submit them at Capstone time ready for course completion TAFE NSW REQUIRED RESOURCES Wiring Rules AS/NZS 3000:2018 With latest amendments Downloadable from TechStreet – link on Moodle – UEE30820 course page – forms and links Electronic copy is NOT acceptable. TAFE NSW REQUIRED RESOURCES Service and Installation Rules of NSW October 2019 Downloadable from web. Link on Moodle – UEE30820 course page – forms and links Electronic copy is NOT acceptable. TAFE NSW REQUIRED RESOURCES Metering Requirements - Annexure July 2018 Downloadable from web. Link on Moodle – UEE30820 course page – forms and links (Use NSW Service and Installations Rule - Link) Metering Requirements used to be included in the NSW Service and Installation Rules. Metering is now considered part of the Consumers Installation. (To allow for more competition in the Energy Market). As part of this regulation change, the Metering Requirements were separated into a stand alone document, separate from the Service and Installation rules TAFE NSW  REQUIRED RESOURCES Text Book Electrical Wiring Practice Petherbridge / Neeson / Lowe (McGraw Hill) Purchase from Bookstore on campus – Newcastle (Tighes Hill) TAFE NSW 8 RESOURCES Moodle Unit Access (EL03) Your teacher will provide an enrolment key to access the unit resources on Moodle Each section has quizzes to test your knowledge and understanding Assessments (Knowledge Tests) are conducted online here also TAFE NSW 9 EL03 ASSESSMENTS This units has 6 Assessments. All Assessments must be passed to be deemed competent in the Unit of Competency. (Your workbook may outline the old Assessment regime). If you miss an assessment, or fail an assessment, you will be given an opportunity to apply for a re- assessment. Documentation for a missed assessment is required (such as Doctor’s certificate). Assessment 1 of 6 – Ten (10) x Topic Assessments. Can be completed on campus or off campus. Pass mark 100%. You will have 5 attempts at each Topic Assessment. Topic Assessments 1-5 to be completed prior to Knowledge Test 1, Topic Assessments 6-10 to be completed prior to Knowledge Test 2. Assessment 2 of 6 – Knowledge Test 1. Closed book Test conducted on campus. Assesses Topics 1 to 5 in your workbook. Pass mark 70% Assessment 3 of 6 – Skills Test – (Wiring of MEN earthing system for Main Switchboard) Assessment 4 of 6 – Knowledge Test 2. Closed book Test conducted on campus. Assesses Topics 6 to 10 in your workbook. Pass mark 70% Assessment 5 of 6 – Skills Test – (Wiring of Main Switchboard) Assessment 6 of 6 – Work Evidence. Your employer needs to verify completion of all workplace evidence as required by this Unit. You will need to be up to date with eProfiling and attach a copy of your progress report to this assessment as evidence. TAFE NSW 10 UAG DECLARATION Your teacher will now confirm your understanding of the Assessments in this unit by gaining your signature on this document. Your teacher may also print and distribute the Unit Assessment Guide. (If you would like a copy please advise your teacher). TAFE NSW 11 EL03 – SECTIONS 1. Protection for Safety 6. Devices for Automatic Disconnection 2. Hazards and Risks in Electrical Installations 7. Protection against Overload and Short circuit current 3. Circuit and Control Arrangements 8. Protection against Over voltage and Under voltage 4. Protection against Indirect Contact 9. Control of Electrical Installations and Circuits 5. Earthing (Includes Skills Practice - suggest 2 10. Switchboards and Distribution boards (Includes Skills lessons) Practice – suggest 2 lessons) ASSESSMENT – KNOWLEDGE TEST 1 ASSESSMENT – KNOWLEDGE TEST 2 (pass mark 70%) (pass mark 70%) Topic Assessments 1-5 must be completed to 100% Topic Assessments 6-10 must be completed to 100% SKILLS ASSESSMENT – M.E.N. EARTHING SKILLS ASSESSMENT – MAIN SWITCHBOARD TAFE NSW 12 SECTION 1 PROTECTION FOR SAFETY 13 AS/NZS3000:2018 Part 1 provides uniform essential elements that constitute the minimum regulatory requirements for a safe electrical installation Part 2 provides installation practices that achieve certainty of compliance with the essential safety requirements of Part 1 TAFE NSW 14 SCOPE – CLAUSE 1.1 AS/NZS 3000 sets out requirements for the design, construction and verification of electrical installations These requirements are intended to protect persons, livestock, and property from electric shock, fire and physical injury TAFE NSW 15 APPLICATION – CLAUSE 1.2 AS/NZS 3000 may be applied through legislative requirements. (i.e. Can be made legally binding through other documents such as the Electrical Safety Act) The principal application of this Standard is to electrical installations in all types of premises and land used by electricity consumers. TAFE NSW 16 FUNDAMENTAL PRINCIPLES – CLAUSE 1.5 Clause 1.5 outlines the Fundamental Principles of AS/NZS 3000. To ensure the safety of persons, livestock and property…. ….with the requirement to manage the major risks of Shock Current, Excessive temperatures, and Explosive atmospheres TAFE NSW 17 WORKBOOK SECTION 1 Please complete the following questions: (approx. 10mins)  Questions 1 under the Application of the Rules heading from your workbook  Question 1 to 2 under the Fundamental Principles heading in your workbook TAFE NSW 18 DEFINITIONS CLAUSE 1.4 Clause 1.4 provides a set of definitions for key words used in AS/NZS 3000. A good understanding is needed of this section as the words are used throughout AS3000 and the meaning must be understood. TAFE NSW 19 DIRECT CONTACT This definition outlines a situation whereby a person makes direct contact with live parts in normal service. The rules outline ways to protect against this situation – called Basic Protection Basic Protection includes things such as  Insulation  Barriers  Obstacles  Placing out of reach TAFE NSW 20 WORKBOOK SECTION 1 Please complete the following questions: (approx. 5mins)  Questions 1 to 5 under the Definitions heading from your workbook TAFE NSW 21 BASIC PROTECTION Basic Protection is designed to protect a consumer (or Electrician) from touching live parts. Basic Protection is used to protect against Direct Contact Note: This does not protect from intentional contact – such as placing a conductive component in a socket outlet!! TAFE NSW 22 WORKBOOK SECTION 1 Please complete the following questions: (approx. 10mins)  Question 1 to 6 under the Basic Protection (Protection against direct contact) heading in your workbook TAFE NSW 23 INDIRECT CONTACT This definition outlines a situation whereby a person makes contact with a conductive part that is not normally live but has become live under fault conditions. The rules outline ways to protect against this situation – called Fault Protection Indirect contact most usually occurs due to a breakdown in insulation. (Fault condition) Fault Protection includes:  Automatic disconnection of supply (fuse/circuit breaker)  Use of class 2 equipment (double insulation)  Electrical Separation  Limit fault current TAFE NSW 24 TOUCH CURRENT AND TOUCH VOLTAGE Touch current is the current that passes through the body when it touches a live part. This can occur under normal or fault conditions. i.e. by Direct or Indirect contact. Touch voltage is the voltage appearing between simultaneously accessible parts. The term is only used in connection with fault protection. Ie Indirect contact. TAFE NSW 25 WORKBOOK SECTION 1 Please complete the following questions: (approx. 10mins)  Questions 6 to 13 under the Definitions heading from your workbook TAFE NSW 26 WORKBOOK SECTION 1 Please complete the following questions: (approx. 10mins)  Question 1 to 4 under the Fault Protection (Protection against indirect contact) heading in your workbook TAFE NSW 27 EARTHING ARRANGEMENTS - SECTION 5 Earthing arrangements shall be selected and installed to perform the following functions  Enable automatic disconnection  Earth reference via functional earth (FE) arrangements.  Mitigate voltage differences appearing between exposed conductive parts of equipment and extraneous conductive parts.  Provide an effective and reliable low impedance fault path.  Provide measures for the connection of exposed conductive parts and extraneous conductive parts. TAFE NSW 28 MEN EARTHING SYSTEM The M.E.N. multiple earthed neutral – earthing system is the standard distribution system for Australia and New Zealand. Under the MEN system, the neutral conductor (PEN) of the distribution system is earthed at the source of supply at regular intervals throughout the system and at each electrical installation connected to the system. TAFE NSW 29 MEN EARTHING SYSTEM MEN system allows for clearing of faults even under conditions of open circuit neutral conductors. It can achieve this, by earth fault current travelling through multiple paths back to the supply source. (Much more on this in the Earthing Section) Clearing faults quickly reduces the risk of touch voltages being present under fault conditions TAFE NSW 30 EARTHING COMPONENTS TAFE NSW 31 EARTHING COMPONENTS TAFE NSW 32 EARTHING COMPONENTS TAFE NSW 33 EARTHING COMPONENTS TAFE NSW 34 EARTH FAULT LOOP The earth fault loop is shown on the right. It is vital that this path has a low impedance allowing the fault to be cleared within the required time. (Ensuring touch voltages are not present) Wiring rules outline the impedance requirements for the fault loop. This is covered in detail in a later section TAFE NSW 35 WORKBOOK SECTION 1 Please complete the following questions: (approx. 15mins)  Questions 14 to 25 under the Definitions heading from your workbook TAFE NSW 36 CLASS OF EQUIPMENT Equipment is classified according to its protection method:  Class 1 equipment – Earthed  Class 2 equipment – Double insulated  Class 3 equipment – Extra Low Voltage TAFE NSW 37 WORKBOOK SECTION 1 Please complete the following questions: (approx. 5mins)  Question 1 under the Equipment Classes – Protection by Design heading in your workbook TAFE NSW 38 OVERLOAD V SHORT CIRCUIT An overload is an overcurrent occurring in a circuit that is electrically sound. An example could be a socket outlet circuit with too many appliances plug in and operating. A short circuit is a fault current resulting from a fault of negligible impedance between live conductors. An example could be failed insulation between conductors of different voltages, such as 3 phase consumer mains. TAFE NSW 39 PROTECTING AGAINST OVERCURRENT'S AS3000 outlines methods that the electrician must follow to protect persons, livestock, and property against dangers that may arise. (And overcurrent's are definitely a situation that may give rise to danger) Circuits breakers and fuses are common methods used to disconnect the supply when overcurrent's occur. These will be covered in detail in a later section. TAFE NSW 40 WORKBOOK SECTION 1 Please complete the following questions: (approx. 15mins)  Questions 26 to 36 under the Definitions heading from your workbook TAFE NSW 41 WORKBOOK SECTION 1 Please complete the following questions: (approx. 20mins)  All Questions under the headings of Protection against thermal effects, overcurrent, abnormal voltages, spread of fire, mechanical movement, external influences in your workbook TAFE NSW 42 INSTALLATION DESIGN AS3000 outlines specific methods for an electrician to follow when designing an electrical installation. Circuits need to be appropriately designed to ensure they operate as intended and are safe. Equipment needs to be on dedicated circuits in many cases and installations need to be divided into an appropriate number of separate circuits. Mains cabling (Consumer mains) need to be designed to ensure they can carry the intended load safely and operate as intended. A determination of the maximum demand of the consumer mains and installation needs to be undertaken to choose the correct size of cabling. TAFE NSW 43 WORKBOOK SECTION 1 Please complete the following questions: (approx. 45mins)  All remaining questions from Section 1 in your workbook TAFE NSW 44 ONLINE QUIZ Once this section in your workbook is completed, attempt the ONLINE QUIZ questions on Moodle. They will provide you with an opportunity to test your understanding, giving immediate feedback, and they will also test your understanding of relevant Standards / Regulations. TAFE NSW 45 THE END TAFE NSW