Assignment Conductors Part 3 Week 4

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Georgian College *

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2010

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Electrical Engineering

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Feb 20, 2024

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Assignment Conductors Part 3 Week 4 Question 1 A 3 conductor #3 AWG copper cable is being run under a driveway, it has been decided that a pressure treated board will be placed over top for protection. What is the minimum allowable depth that this cable can be buried? 750 mm 800 mm 900 mm 1050 mm Rule 12-012(1) Table 53 Vehicular area 750 or less = 900m Rule 12-012 (3)(a) 3) Mechanical protection shall consist of one of the following and, when in flat form, shall be wide enough to extend at least 50 mm beyond the cables or raceways on each side: a) treated planking at least 38 mm thick; 900+150=1050mm Question 2 A factory requires a 3Phase Wye 347/600V Service with an amperage of 1500A. This application is considered a continuous load. The installation plan requires 3 conductors run in parallel per phase buried directly underground with the phases grouped together. What diagram is used for spacing and burial depth? What size must the conductors be? Rule 4-004 1) 8) TD10B Detail 3: 900kcmil @ 500A

Rule 4-004 1) d) TD10B Detail 3: 800kcmil @ 518A Rule 4-004 1) d) TD10A Detail 3: 750kcmil @ 518A Rule 4-004 1) d) TD10A Detail 3: 600kcmil @ 500A Rule 4-004 1) d) TD10A Detail 3 Diagram D10 Detail 3 1500A/3=500A Table D10A for 518@ detail3) =750 kcmail Question 3 A 3phase 600 amp service is being fed from a 500KVA pad mounted transformer. The load is a non-continuous load (The equipment will not be on all the time, the demand will vary depending on devices being used). It has been decided to run 3 single aluminum conductors per phase to feed the service. The phase cables will be directly buried together in 3 separate conduits. What diagram is used to determine proper installation (depth and spacing)? And what is the ampacity of the individual cables with the size? 300 Kcmil TD10 Detail 3 200 kcmil TD11A Detail 3 250 kcmil TD11B Detail 3 3/0 TD 10 Detail 2 3 separate conduits/3phase/aluminum conductors 4-004-(2)(D) 600/3=200Amp Table D11B (T11B for 200Amps @ detail 3) =250 Kcmail Question 5

300KVA Transformer 7200v Delta 600v Wye Parallel 0000 Awg Aluminum (8 Single Conductors) 170ft Long in 4 Inch PVC Duct Type II or DB1 Transformer Z percent 4.7, Main Disconnect 400amp Fused @ 350Amp Time Delay HRC Dual Element. What is the applied Voltage at the Main Disconnect, at all WYE Configuration Connections, assume wires are all exactly the same length. Hint think outside the box - the answer may be easier than you think - there is no real math involved Rule 4-004 2) b) d) (Table 2 & Table 5c) 3/0 RWU90. As per 8-102 2) a) as it would meet the 5% maximum Voltage Drop Rule 4-004 1) b) d) (Table 2 & Table 5c) 3/0 RWU90. As per 8-102 1) a) as it would meet the 5% maximum Voltage Drop Rule 4-004 2) c) d) (Table 4 & Table 5c) 4/0 RWU90. As per 8-102 1) a) as it would meet the 3% maximum Voltage Drop Rule 4-014 2) a) b) (Table 2 & Table 5c) 4/0 RWU75. As per 8-101 2) a) as it would meet the 3% maximum Voltage Drop L= Lt x P DCF x (V/120) Lt(Table D3) x P (percentage voltage drop) x DCF (Calculated with Tables) x (VApplied/120(Table D3 Voltage)) Rule 4-004 2) c) d) (Table 4 & Table 5c) 4/0 RWU90. As per 8-102 1) a) as it would meet the 3% maximum Voltage Drop Table D3 170ft =51.8m LT=51.8 x 3 0.95 x 350/410= Table d3= 6.2 LT=6.2mx 3 0.95 x 350/410= 88.35 m

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Question 6 A 2000 amp service is being fed from a 1850 KVA pad mounted transformer. The load is a continuous. It has been decided to run three 3 conductor copper cables (Triplex) in parallel to feed the service. The cables will be directly buried. a) What diagram is used to determine proper installation (depth and spacing)? b) And what is the ampacity of the individual cables with the size? TD10A Detail 3: 190mm Separation 915mm below o/c, 1500Kcmil @ 670A TD11A Detail 2: 190mm Separation 915mm below o/c, 1750Kcmil @ 670A TD10B Detail 1: 185mm Separation 900mm below o/c, 1750Kcmil @ 670A TD10B Detail 1: 190mm Separation 900mm below o/c, 2000Kcmil @ 670A Rule 4-004 1) d) Diagram D11 and Table D11A 2000/3= 666.67amps Table D10 and D11A (T10A for #1500kcmail and detail 3) = 670Amp And table D10 detail 3 = 190mm Separation 915mm below o/c Question 7 A 60 amp MicroFit solar array is located 170 m from the hydro service. It has been decided to feed the system with 0awg copper RWU 90 cable. Determine the maximum length of run between the load and the distribution centre for the 240 V solar arrays. A at 3 percent voltage drop is acceptable? Is the 0 awg cable sufficient for the job? 3/0 or 000 is sufficient

5% voltage drop is suffcient 3% Voltage drop @ 162m is suffcient 1/0 or 0 is not sufficient L= Lt x P DCF x (V/120) Lt(Table D3) x P (percentage voltage drop) x DCF (Calculated with Tables) x (VApplied/120(Table D3 Voltage)) 60A @ 240V 170m away Rule 4-004 Apendix B DCF: 60A/170A (T2 for #0@90°C) x 100 = 35.29% DCF allowable ampacity for 90C =40% (cant use 35.29% CF= 1.08 Table 3D 63A of 1/0 = 25m L= 25m x 3 x 1.08 x (240/120) =162m Maximum length