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Questions and Answers
What is the minimum distance communications wires and cables should be separated from service drops of electric light and power conductors?
What is the minimum distance communications wires and cables should be separated from service drops of electric light and power conductors?
- 150 mm
- 200 mm (correct)
- 175 mm
- 300 mm
How many wires would be needed for a WYE-DELTA starter for a single voltage three phase SC induction motor?
How many wires would be needed for a WYE-DELTA starter for a single voltage three phase SC induction motor?
- 9 wires
- 12 wires
- 6 wires (correct)
- 3 wires
What is NOT an advantage of stranded wires of the same cross-sectional area compared to solid wires?
What is NOT an advantage of stranded wires of the same cross-sectional area compared to solid wires?
- It is better for high voltage
- It has a higher current rating
- It is larger in overall diameter (correct)
- It is easier to skin off the insulation
According to the PEC Code, what is the minimum insulation level for neutral conductors of residential installations with solidly grounded systems?
According to the PEC Code, what is the minimum insulation level for neutral conductors of residential installations with solidly grounded systems?
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Study Notes
Minimum Distance for Communication Cables
- Communication wires and cables should be separated from service drops of electric light and power conductors by a minimum distance of 300 mm (1 foot).
WYE-DELTA Starter Wires
- A WYE-DELTA starter for a single voltage three-phase squirrel cage induction motor requires a total of 9 wires: 3 for the WYE connection, 3 for the DELTA connection, and 3 control wires for the starting sequence.
Disadvantage of Stranded Wires
- A disadvantage of stranded wires compared to solid wires of the same cross-sectional area is lower electrical conductivity. Stranded wires can also be less robust against physical stress and deformation over time.
Minimum Insulation Level for Neutral Conductors
- According to the Philippine Electrical Code (PEC), the minimum insulation level for neutral conductors in residential installations with solidly grounded systems is rated for at least 600 volts.
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