Cable Selection and Current Rating Quiz

What is the significance of surrounding temperature in cable selection?

• It affects the color of the cable

• It increases cable resistance and may melt insulation

• It determines the length of the cable

• It changes the cable's material

What does I_n stand for in the cable selection criteria?

• Design current of the circuit

• Rated current or current setting of protective device

• Tabulated current carrying capacity

• Maximum voltage drop

What is the cable rating (Iz) calculated for the circuit?

• 55A

• 57A

• 30A

• 28.26A

Which appendix provides the correction factor for ambient temperature?

• Appendix 4

• Appendix 3

• Appendix 5

• Appendix 2

What is the installation method reference for the cable?

• Table 4A2 Reference Method 100

• Table 4B1 Reference Method 200

• Table 4C1 Reference Method 300

• Table 4D5 Reference Method 400

What is the volt drop per ampere metre for a 16mm² cable according to Table 4D5 Column 8?

• 1.8mV

• 2.8mV

• 3.8mV

• 4.8mV

What is the calculated voltage drop for a 16mm² cable with a length of 18 metres and a design current of 28.26A?

• 0.42V

• 1.42V

• 2.42V

• 3.42V

What is the factor for cable grouping with one similar cable from Table 4C1?

• 0.6

• 0.7

• 0.8

• 0.9

What type of circuit breaker protection is used when the 10mm² cable satisfies the requirements?

• Type B

• Type C

• Type D

• Type A

What is the correction factor for a cable installed in an insulated wall according to Table 4B1?

• 0.5

• 0.6

• 0.7

• 0.8