303 #6 - Fault Current Ratings & Standard Circuits Quiz

What does Icn represent on a circuit breaker?

• Installation current

• Conductor insulation number

• Rated short-circuit breaking capacity

• Current neutralisation level

Which of the following devices is known for a high breaking capacity?

• BS3036 fuse

• Type B MCB

• BS88 fuse

• RCD

What standard applies to modern miniature circuit breakers (MCBs)?

• BS88

• BS3036

• BS EN 60898

• BS 7430

Which type of circuit is used for fixed electric heating equipment?

• Ring final

• Radial circuit

• Spur

• Pilot circuit

What is the typical conductor size for a domestic lighting circuit?

• 2.5 mm²

• 6.0 mm²

• 1.0 mm²

• 4.0 mm²

What is the purpose of circuit standardisation?

• Makes installation cheaper

• Allows use of colour-coded trunking

• Ensures safety and consistency

• Avoids inspections

Which type of circuit supplies multiple socket outlets from a ring?

• Radial

• Spur

• Ring final

• Protective

Which protective device standard is now considered obsolete in most new installs?

• BS EN 60898

• BS88

• BS3036

• BS EN 61009

Where would you most likely use an RCBO?

• Bathroom circuits where shock risk exists

• Outdoor light post

• Cooker circuit

• Office lighting

What key document outlines common circuit arrangements?

• BS5266

• BS5839

• On-Site Guide

• Building Regs Part L