What does Part 2 of BS 7671 primarily provide?

• Guidelines for outdoor electrical systems

• Safety regulations for electrical appliances

• Detailed chapters on electrical installations

• Technical definitions used throughout the document

What feature does Part 2 of BS 7671 include at the end?

• Two tables explaining symbols and abbreviations used

• Safety guidelines for electrical installations

• A list of recommended electrical equipment

• A comprehensive index

What does the 'T' in earthing system codes stand for?

• Terre (earth in French)

• Terminal

• Transformer

• Transfer

Which earthing system includes earth electrodes that are independent of the source's earth electrodes?

• TN-C

• IT

• TN-S

• TT

What is the nominal voltage range for Low Voltage (LV)?

• Normally exceeding 1000 V a.c.

• Up to 500 V a.c. in residential areas

• Exceeding extra-low voltage but not exceeding 1000 V a.c. or 1500 V d.c.

• Not exceeding 50 V a.c. or 120 V ripple-free d.c.

What does the classification code 'BA4' relate to in terms of external influences?

• Mechanical impacts of medium severity

• Protection against water ingress

• Persons adequately advised or supervised by skilled persons

• High ambient temperatures

What does an IP code indicate?

• The insulation properties of electrical cables

• The power rating of electrical appliances

• The installation procedures for electrical systems

• The degree of protection against access to hazardous parts and ingress of foreign bodies

Which IP code is required for equipment installed in Zone 0 of a swimming pool?

• IP2X

• IPX6

• IP44

• IPX8

What does the 'S' in a TN-S system stand for?

• Secure

• System

• Separate

• Shielded

What is the correct symbol for the sum of the resistances of the earth electrode and the protective conductor connecting it to the exposed conductive parts?

• Zs

• Ra

• R1+R2

• Uoc