Cable Sizing and Ingress Protection Quiz

What is the current drawn by a 0.75 kW, 230V appliance?

• 1.63A
• 3.26A
• 4.89A
• 6.52A

What is the purpose of the IET On-site Guide?

• Provides additional information not found in BS 7671
• Explains how to calculate cable sizes
• Describes how to install electrical equipment
• Covers all aspects of electrical installations

Which factor does NOT influence the current carrying capacity of a cable?

• Type of cable insulation
• Surrounding temperature
• Installed conditions
• Cable length

What does the first digit in an IP rating represent?

• Ingress protection against moisture
• Ingress protection against solid objects
• Ingress protection against dust
• Ingress protection against contact with live parts

An IP65 rating indicates protection against:

• Dust and water jets
• Dust and immersion
• Light rain and contact with tools
• Solid objects and light rain

An IP67 rating indicates protection against:

• Dust and high pressure water jets
• Dust and temporary immersion
• Dust and continuous immersion
• Solid objects and high pressure water jets

An extractor fan rated at IP24 can be installed in:

• Zone 0 of a bathroom
• Zone 1 of a bathroom
• Zone 2 of a bathroom
• Outside a bathroom

What is the minimum IP rating required for an extractor fan installed in Zone 2 of a bathroom?

• IP44
• IP54
• IP65
• IPX4

Which of the following statements about cable sizing is correct?

• Cable size is always determined by the maximum current load
• Cable size is solely dependent on the cable cross-sectional area
• Cable size is influenced by many factors including installation conditions
• Cable size is typically specified by the appliance manufacturer

What is the typical cable size used for lighting circuits in a dwelling?

• 1.0 mm²
• 1.5 mm²
• 2.5 mm²
• 4.0 mm²