Load in Figure 1 needs to be connected to Mains Switch Board (MSB) using multicore PVC cable. As a maintenance engineer, you need to proposed cable size for the load. Determine the following issues. i) Calculate current demand for the cireuit 11) Detemine sutable MCCB (Model and nominal current rating) should be used to protect the load against over-current. 111) Propose suitable cable size for the load in Figure 1.

Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter7: Symmetrical Faults
Section: Chapter Questions
Problem 7.21MCQ
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Load in Figure 1 needs to be connected to Mains Switch Board (MSB) using multicore
PVC cable. As a maintenance engineer, you need to proposed cable size for the load,
Determine the following issues.
1) Calculate current demand for the circuit.
1) Detemine suitable MCCB (Model and nominal current rating) should be used to
protect the load against over-current.
im Propose suitable cable size for the load in Figure 1.
iv) Calculate voltage drop of the proposed cable WITHOUT consider the cable
reactance and voltage drop correction due to higher cable operating temperature
v) Calculate voltage drop of the proposed cable BY consider the cable reactance and
voltage drop correction due to higher cable operatıng temperature
vi) If the multicore PVC eable is change into 3 single core PVC cables, what the
suitable cable size. All other multicore cables not available.
(25 + variable x) m (A) 30 m (B)
(15 + variable b) m (C)
Multicore
PVC
cable
MCCB
95 kW. (400 +
variable y) V.
0.85 p.f. Load
MSB
Ambient
temperature =
30°C
Ambient
Ambient
temperature =
35°C
temperature =
35°C
Grouping with
other 5 multicore
Grouping with
other 3 multicore
cabies
cables
On perforated
cable tray laid
evenly spacing i evenly spacing evenly spacing
On perforated
cable tray laid
On perforated
cable tray laid
Figure 1
Based on question above, please assume
variable x= 5 & variable b= 4.
please do a calculation.
Transcribed Image Text:Load in Figure 1 needs to be connected to Mains Switch Board (MSB) using multicore PVC cable. As a maintenance engineer, you need to proposed cable size for the load, Determine the following issues. 1) Calculate current demand for the circuit. 1) Detemine suitable MCCB (Model and nominal current rating) should be used to protect the load against over-current. im Propose suitable cable size for the load in Figure 1. iv) Calculate voltage drop of the proposed cable WITHOUT consider the cable reactance and voltage drop correction due to higher cable operating temperature v) Calculate voltage drop of the proposed cable BY consider the cable reactance and voltage drop correction due to higher cable operatıng temperature vi) If the multicore PVC eable is change into 3 single core PVC cables, what the suitable cable size. All other multicore cables not available. (25 + variable x) m (A) 30 m (B) (15 + variable b) m (C) Multicore PVC cable MCCB 95 kW. (400 + variable y) V. 0.85 p.f. Load MSB Ambient temperature = 30°C Ambient Ambient temperature = 35°C temperature = 35°C Grouping with other 5 multicore Grouping with other 3 multicore cabies cables On perforated cable tray laid evenly spacing i evenly spacing evenly spacing On perforated cable tray laid On perforated cable tray laid Figure 1 Based on question above, please assume variable x= 5 & variable b= 4. please do a calculation.
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