{"id":7989,"date":"2020-11-17T15:56:16","date_gmt":"2020-11-17T15:56:16","guid":{"rendered":"http:\/\/onlineclassesguru.com\/?p=7989"},"modified":"2020-11-17T15:56:16","modified_gmt":"2020-11-17T15:56:16","slug":"electrical-installation","status":"publish","type":"post","link":"https:\/\/onlineclassesguru.com\/index.php\/2020\/11\/17\/electrical-installation\/","title":{"rendered":"Electrical Installation"},"content":{"rendered":"<style type=\"text\/css\"><\/style><p>1. A roof mounted lamp as shown in Figure Q1 is used to provide the general lighting for a room. The illuminance measured directly below the lamp is 200 lux at point A. It is assumed that the lights radiate uniformly in all downward directions from the lamps.<\/p>\n<p>Figure Q1<\/p>\n<p>(a) Determine the intensity of the lamp.<\/p>\n<p>(b) Determine the illuminance at point B.<\/p>\n<p>(c) If a new lamp of intensity 900 cd is mounted at the roof directly above point B, what will be the new illuminance at point B with both lamps turned on?<\/p>\n<p>Name:______________________ Class:_______________ Electrical Installation (EEE4118)<\/p>\n<p>Submission date: Assignment 2 Page 2 of 4<\/p>\n<p>2. In Figure Q2, a single-phase, 220 V, 2.2 kW motor of power factor 0.84 and efficiency<\/p>\n<p>0.79 is fed by a 6 mm2 2\/C PVC\/PVC copper cable. A 20 A BS88-2 HRC fuse is used<\/p>\n<p>for protecting this circuit from short-circuit fault. Given that:<\/p>\n<p>\u0095 the total cable length of the live and neutral conductor to form the circuit loop is 55 m;<\/p>\n<p>\u0095 the resistance of the 6 mm2 cable during short circuit is 7 ? \/km;<\/p>\n<p>\u0095 the prospective short-circuit current at the 20 A BS88 HRC fuse is 6.5 kA.<\/p>\n<p>Figure Q2<\/p>\n<p>(a) Determine the minimum prospective short circuit current at the motor terminals.<\/p>\n<p>(b)<\/p>\n<p>If the starting current of the motor is 6 times full load current and lasts for 5<\/p>\n<p>seconds, comment whether the 20 A BS88-2 HRC fuse is suitably selected or not,<\/p>\n<p>with proper explanation. If not, determine the new minimum rating for the BS88-2<\/p>\n<p>HRC fuse with proper explanation.<\/p>\n<p>20 A BS88-2<\/p>\n<p>HRC fuse<\/p>\n<p>6 mm2 2\/C PVC\/PVC copper cable<\/p>\n<p>Motor<\/p>\n<p>Name:______________________ Class:_______________ Electrical Installation (EEE4118)<\/p>\n<p>Submission date: Assignment 2 Page 3 of 4<\/p>\n<p>Name:______________________ Class:_______________ Electrical Installation (EEE4118)<\/p>\n<p>Submission date: Assignment 2 Page 4 of 4<\/p>\n<p>3. In Figure Q3, a 220 V a.c. equipment, which is located in an equipotential zone, is<\/p>\n<p>protected by a 32 A BS88-2 HRC fuse and fed by a 6 mm2 1\/C PVC insulated copper<\/p>\n<p>cable. A separate 4 mm2 1\/C PVC copper cable is used as the circuit protective<\/p>\n<p>conductor (CPC) for the installation. Given that:<\/p>\n<p>\u0095 the cable length measured from the MCB board to the equipment is 45 m<\/p>\n<p>\u0095 the impedance of 6 mm2 copper cable (each conductor) is 3.65 m?\/m<\/p>\n<p>\u0095 the impedance of 4 mm2 copper cable (each CPC conductor) is 5.5 m?\/m<\/p>\n<p>\u0095 the earth fault loop impedance external to the installation (ZE) is 0.4 ?<\/p>\n<p>\u0095 k factor of the CPC is 115<\/p>\n<p>Determine:<\/p>\n<p>(a) the prospective earth fault current of the installation,<\/p>\n<p>(b) whether the disconnected time of the fuse due to the earth fault can fulfill the<\/p>\n<p>requirement of the CoP for the Electricity (Wiring) Regulations, and<\/p>\n<p>220V<\/p>\n<p>N<\/p>\n<p>L<\/p>\n<p>E<\/p>\n<p>Figure Q3<\/p>\n<p>ZE<\/p>\n<p>Z1<\/p>\n<p>Z2<\/p>\n<p>32A<\/p>\n<p>Name:______________________ Class:_______________ Electrical Installation (EEE4118)<\/p>\n<p>Submission date: Assignment 2 Page 5 of 4<\/p>\n<p>(c) whether the 4 mm2 1\/C PVC copper cable is suitable for being used as the CPC<\/p>\n<p>for the installation by using the Adiabatic equation.<\/p>\n<p><center><a href=\"http:\/\/onlineclassesguru.com\/orders\/ordernow\"><img decoding=\"async\" src=\"https:\/\/encrypted-tbn0.gstatic.com\/images?q=tbn:ANd9GcTyj99p60XCLyLk1htB7-1neRt8-2QdnenNlQ&usqp=CAU\"target=\"_http:\/\/onlineclassesguru.com\/orders\/ordernow\"\/><\/center><p>","protected":false},"excerpt":{"rendered":"<p>1. A roof mounted lamp as shown in Figure Q1 is used to provide the general lighting for a room. The illuminance measured directly below the lamp is 200 lux at point A. It is assumed that the lights radiate uniformly in all downward directions from the lamps. Figure Q1 (a) Determine the intensity of&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-7989","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Electrical Installation - onlineclassesguru<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/onlineclassesguru.com\/index.php\/2020\/11\/17\/electrical-installation\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Electrical Installation - onlineclassesguru\" \/>\n<meta property=\"og:description\" content=\"1. 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A roof mounted lamp as shown in Figure Q1 is used to provide the general lighting for a room. The illuminance measured directly below the lamp is 200 lux at point A. It is assumed that the lights radiate uniformly in all downward directions from the lamps. 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