Electrical Safety Standards Quiz

What is the basic safety standard mentioned in Chapter 41 for protection against electric shock?

• BS EN 61140

• BS EN 61439

• BS EN 61000

• BS EN 61558

According to BS EN 61140, what is the requirement for hazardous-live-parts under normal conditions?

• They must be accessible

• They must not be accessible

• They must be insulated

• They must be grounded

What type of voltages are specified in BS 7671 unless stated otherwise?

• AC voltages are peak

• DC voltages are ripple-free

• AC voltages are average

• DC voltages are fluctuating

What is an example of an enhanced protective measure mentioned in the document?

• Grounding

• Reinforced insulation

• Circuit breaker

• Fuse

Which protective measure is most commonly used in electrical installations?

• Reinforced insulation

• Automatic disconnection of supply

• Extra-low voltage

• Electrical separation

Under what conditions can the protective measures specified in Section 417 be used?

• Skilled persons only

• Instructed persons under supervision of skilled persons

• Unskilled persons

• General public

What is one of the protective measures specified in Section 418?

• Non-conducting location

• Use of obstacles

• Basic insulation

• Audible alarms

What is the purpose of automatic disconnection of supply?

• To provide basic protection and fault protection

• To increase voltage supply

• To reduce energy consumption

• To enhance signal strength

What additional protection is provided by an RCD according to Regulation 415.1?

• Rated residual operating current not exceeding 30 mA

• Rated residual operating current not exceeding 50 mA

• Rated residual operating current not exceeding 10 mA

• Rated residual operating current not exceeding 100 mA

What is the purpose of protective equipotential bonding in a building?

• To connect all electrical devices to a single power source

• To introduce a potential difference in the system

• To connect extraneous-conductive-parts to the main earthing terminal

• To isolate the building from external electrical interference