Assignment Conductors Part 3 Week 4
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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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