2365 203 #7 - Cooker Circuits & Diversity

What does 'diversity' mean in electrical installation design?

• Using different types of wiring systems

• Reducing total design current based on usage patterns

• Installing backup generators

• Combining multiple protective devices

Why is diversity applied to cooker circuits?

• To simplify installation

• To reduce actual load demand on the circuit

• To increase voltage drop

• To balance the lighting load

What is the typical base load used when applying diversity to a domestic cooker circuit?

• First 10A of load

• 5A for oven

• 30A for whole cooker

• 16A plus 5A per socket

After the first 10A of cooker demand, what percentage of the remaining current is added when applying diversity?

• 10%

• 30%

• 40%

• 50%

If a cooker has a rated load of 20A, what is the design current using diversity?

• 10A

• 14A

• 20A

• 18A

What regulation or guide provides information about diversity?

• BS7671 Appendix A

• On-Site Guide Appendix H

• Part P

• GN3 Section 2

What is the formula for cooker diversity in domestic settings (without socket outlet)?

• Total load × 1.25

• 10A + 40% of remainder

• 5A + 25% of total

• 16A per ring

When must full load be used instead of applying diversity?

• When installing LED lighting

• When load is under 5A

• For commercial cookers or specific manufacturer instructions

• On all cooker switches

What is the minimum cable size usually used for domestic cooker circuits?

• 1.0mm²

• 2.5mm²

• 4.0mm²

• 6.0mm²

What protective device is commonly used on a domestic cooker circuit?

• 16A MCB

• 32A MCB

• 50A fuse

• 13A plugtop