Electrical Installation Quiz

Calculate the design current for a 7.5 Kw shower when the Voltage is 230v

Which of the following symbols represent thermal insulation

• Ca

• Cf

• Cg

• Ci

Ib-refers to what

• The over current device rating

• The tabulated current carrying capacity

• The design current

• Ambient temperature

What does the reference method A refer to with regards to Installation methods when installing cables (Table 7.1 P84)

• Clipped Direct

• Enclosed in conduit or trunking on a wall, etc..

• Enclosed in conduit in a insulated wall

• Surrounded by thermal insulation including in a stud wall with thermal insulation with cable not touching a wall

Which appendix refers to the current-carrying capacities and voltage drop for copper conductors

• Appendix A

• Appendix B

• Appendix C

• Appendix F

What does the reference method B refer to with regards to Installation methods when installing cables (Table 7.1 P84)

• Clipped Direct

• Enclosed in conduit or trunking on a wall, etc..

• Enclosed in conduit in a insulated wall

• Surrounded by thermal insulation including in a stud wall with thermal insulation with cable not touching a wall

What does the reference method C refer to with regards to Installation methods when installing cables (Table 7.1 P84)

• Clipped Direct

• Enclosed in conduit or trunking on a wall, etc..

• Enclosed in conduit in a insulated wall

• Surrounded by thermal insulation including in a stud wall with thermal insulation with cable not touching a wall

Which of the following is referring to the overcurrent protective device rating?

• Ib

• In

• It

• Ie

Which of the following symbols represent the cable grouping factor

• Ca

• Cf

• Cg

• Ci

What is the derating factor to be applied to a cable surrounded with 200mm of insulation in a loft

• 0.63

• 0.78

• 0.88

• 1