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The paper provides examination instructions, time limits, candidate code requirements, and marking guidance including pass criteria. Questions assess electrical protection and safety, including RCD switching requirements, fuse failure effects in induction motors, MCB versus HRC fuse selection, hazardous conditions from phase-neutral interchange, and hazards from high prospective short-circuit fault currents. It also includes insulation resistance testing requirements, cable insulation calculations, and starter wiring and motor control topics such as DOL forward/reverse power circuit diagrams and variable speed drive ramp time.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":20,"@type":76,"position":81},"https://docshare.wps.com/document/exam/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/electricians-theory-examination-20-june-2015-question-and-answer-booklet/456472/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/electricians-theory-examination-20-june-2015-question-and-answer-booklet/456472.png","ImageObject",300,407,{"name":92,"@type":93},"acoobca","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-25","2026-09-30",true,{"@type":102,"interactionType":103,"userInteractionCount":39},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What is the pass mark and how long is the examination allowed?","Question",{"text":112,"@type":113},"The pass mark for the examination is 60 marks, with a total time allowed of three hours.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"Why must an RCD for personal protection switch both the phase and neutral poles?",{"text":117,"@type":113},"The question requires stating the reason for switching both poles to provide effective personal protection.",{"name":119,"@type":110,"acceptedAnswer":120},"What two hazardous situations could arise if phase and neutral were interchanged and the installation was livened?",{"text":121,"@type":113},"The paper asks for TWO hazardous situations that could occur after livening when the conductors were reversed at the mains entry box.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},456472,1791144226,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":19,"category_name":20,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":39,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},3985747870733,"https://ap-avatar.wpscdn.com/davatar_a8503ba1806abce46bf441b54a3ca4cd","ET54  \n\n| Candidate Code No. |  |\n| --- | --- |\n| For Board Use Only |  |\n| Result Date Int | Result Date Int |\n\nELECTRICIAN’S THEORY EXAMINATION  \n20 June 2015  \nQUESTION AND ANSWER BOOKLET  \nTime Allowed: Three hours  \nINSTRUCTIONS – READ CAREFULLY  \nYou have 10 minutes to read this paper but do not start writing until you are told todo so by the supervisor.  \nWrite your Candidate Code Number in the box provided above. Your name must NOT appear anywhere on this paper.  \nAnswer all questions.  \nThe pass mark for this examination is 60 marks.  \nUse a pen for written answers . Do not use a pencil or a red pen.  \nDrawing instruments and pencils may be used when diagrams are required. Marks are allocated on the basis of correctness .  \nDo not use correcting fluid or correcting tape.  \nFor calculation questions all workings, including formulae, must be shown to gain full marks.  \nNon-programmable calculators may be used.  \nWarning – You could get 0 marks for any question, or part of a question, if you show anything hazardous or dangerous in your answer.  \nCandidates are not permitted to use any Act, Regulation, Standard, Code of Practice, Handbook or other reference text in this examination.  \nPLEASE HAND THIS PAPER TO THE SUPERVISOR BEFORE LEAVING THE ROOM.  \n(turn over)  \nQuestion 1  \n(a ) State the reason why a residual current device (RCD) used for personal protection is required to switch both the phase and neutral poles?  \n(2 marks)  \n\n|  |\n| --- |\n|  |\n|  |\n\n(b) A three-phase, delta-connected induction motor is controlled by a DOL starter. The motor is protected by HRC fuses and a thermal overload.  \nState what would occur if one fuse blew (opened) while the motor was operating normally under full load.  \n(2 marks)  \n\n|  |\n| --- |\n|  |\n|  |\n\n(c ) State the reason why a three-pole MCB would be used to protect a threephase final subcircuit instead of three HRC fuses .  \n(2 marks)  \n\n|  |\n| --- |\n|  |\n|  |\n\n(turn over)  \nQuestion 1 continued  \n(d) A 400v, three-phase deep-fryer is rated at 15 kW.  \nCalculate maximum current that must be carried by the final subcircuit supplying the deep fryer.  \n(2 marks)  \n(e ) A 240V/230V heater draws 2500W when operating at 230V. Calculate the output power of the heater if the voltage drops 5% .  \n(2 marks)  \n(f) (i) Describe the characteristics of a thermistor.  \n(1 mark)  \n________________________________________________________  \n________________________________________________________  \n(ii) Where in a motor circuit would a thermistor be located?  \n(1 mark)  \n________________________________________________________  \n________________________________________________________  \n(turn over)  \nQuestion 1 continued  \n(g) New mains have been installed in a 230V, single-phase domestic installation. During the work the phase and neutral were interchanged atthe mains entry box.  \nState TWO hazardous situations that could arise if the installation was livened.  \n(2 marks)  \n(1)    \n\n|  |\n| --- |\n|  |\n\n(2)  \n(h) Some protective devices on a switchboard in an electrical installation have a fault duty lower than the prospective short-circuit current rating of the installation.  \nState TWO hazards that could occur when a high prospective short-circuit fault current occurs in the electrical installation.  \n(2 marks)  \n(1)    \n\n|  |\n| --- |\n|  |\n|  |\n\n________________________________________________________  \n________________________________________________________  \n(2)    \n________________________________________________________  \n________________________________________________________  \n(turn over)  \nQuestion 1 continued  \n(i) AS/NZS 3000 requires that a test voltage of 500V d.c . is used for an insulation resistance test of a low voltage electrical installation.  \n(i) Explain why a voltage of 500V is applied.  \n(1 mark)  \n________________________________________________________  \n________________________________________________________  \n(ii) Explain why the voltage is a d.c . voltage.  \n(1 mark)  ","cbCaidZQkiQQ79u5","https://ap.wps.com/l/cbCaidZQkiQQ79u5","pdf",569190,33,"English","# Instructions\n# Question 1\n## Question 1 continued\n# Question 2\n# Question 3","[{\"question\":\"What is the pass mark and how long is the examination allowed?\",\"answer\":\"The pass mark for the examination is 60 marks, with a total time allowed of three hours.\"},{\"question\":\"Why must an RCD for personal protection switch both the phase and neutral poles?\",\"answer\":\"The question requires stating the reason for switching both poles to provide effective personal protection.\"},{\"question\":\"What two hazardous situations could arise if phase and neutral were interchanged and the installation was livened?\",\"answer\":\"The paper asks for TWO hazardous situations that could occur after livening when the conductors were reversed at the mains entry box.\"}]","Electrician’s Theory Examination - 20 June 2015 - Question and Answer Booklet | PDF",1790746156,83]