Electrical Design

What document is referred to throughout the electrical circuit design process?

• BS7671

• On-Site Guide

• Electrical Design Manual

• Circuit Design Handbook

What is the first step in designing an electrical circuit?

• Selecting the cable type

• Calculating the design current (Ib)

• Choosing the protective device

• Determining the voltage drop

Which of the following is NOT a factor in calculating the current carrying capacity (Iz)?

• Grouping of cables

• Type of fuse

• Ambient temperature

• Cable length

What does the 'In' symbolize in the circuit design process?

• Design current

• Nominated rating of protective device

• Current carrying capacity in installed conditions

• Tabulated value of cable

What is the maximum permissible voltage drop for lighting circuits?

• 2%

• 5%

• 10%

• 3%

Which cable type is NOT mentioned in the text?

• T&E

• SWA

• Coaxial

• Multicore

What is the purpose of calculating the voltage drop in a circuit?

• To determine the cable size

• To calculate the design current

• To select the protective device

• To ensure the voltage loss does not exceed permissible limits

Which of the following is a tool NOT listed as necessary for circuit design?

• Multimeter

• On-Site Guide

• Calculator

• BS7671

What does the 'It' represent in the circuit design formula?

• Design current

• Rating of protective device

• Current carrying capacity in installed conditions

• Tabulated value of cable selected from BS7671 tables

What factor is NOT considered when calculating the current carrying capacity (Iz)?

• Installation method

• Cable type

• Voltage drop

• Ambient temperature