2365 203 #23 - Final Project

What is the first step when designing an electrical installation?

• Install the CU

• Order materials

• Interpret the client brief and specification

• Select cable colours

What document provides legal design standards for installations?

• EAWR

• Manufacturer’s leaflet

• BS7671 (IET Wiring Regulations)

• COSHH

Why is it important to follow BS7671 during design?

• To increase cable life

• To make inspection easier

• To ensure safety, compliance, and good practice

• To avoid voltage drop

What is the purpose of a circuit schedule?

• To record how long a job takes

• To track insulation readings

• To list circuits, loads, and protective devices

• To document lighting brands

What is typically included in an electrical design pack?

• Overtime sheets

• Sketches, cable calculations, and protective device details

• Call-out sheets

• Meter box data

What is the main goal of a design presentation in your project?

• Show your artwork

• Demonstrate technical understanding and decision-making

• Display lighting effects

• Promote your tools

What must be calculated when designing a circuit?

• Paint costs

• Length of RCDs

• Design current (Ib), protective device (In), and cable rating (Iz)

• Plastering thickness

What is “diversity” in circuit design?

• Use of different colour wires

• Ensuring different circuits don’t interfere

• Reducing total demand based on expected usage

• Balancing socket height

What does the Zs value represent in design?

• Voltage drop

• System impedance at earth fault

• Supply fuse rating

• Cable resistance

Why is volt drop important in project design?

• Affects total loop resistance

• Can impact appliance performance and regulation compliance

• Helps earth fault detection

• Increases insulation readings