Electrical Safety Quiz CH41

What is the fundamental rule of protection against electric shock according to BS EN 61140?

• Hazardous-live parts shall be accessible and hazardous-live under normal conditions.

• Hazardous-live parts shall not be accessible and accessible conductive parts shall be hazardous-live under normal conditions.

• Hazardous-live parts shall not be accessible and accessible conductive parts shall not be hazardous-live, both under normal conditions and under single fault conditions.

• Hazardous-live parts shall be accessible but not hazardous-live under single fault conditions.

According to 4.10.1 of BS EN 61140, what does protection under normal conditions involve?

• Fault protective provisions only.

• Basic protective provisions and fault protective provisions.

• Enhanced protective provision only.

• No specific provisions are required under normal conditions.

What does Chapter 41 specify regarding protection against electric shock?

• It specifies the types of electrical installations only.

• It specifies the requirements for the application and coordination of additional protection in certain cases.

• It specifies the requirements for the application and coordination of basic protection and fault protection of persons and livestock.

• It specifies the requirements for the application of enhanced protective provisions under single fault conditions.

Which of the following is NOT a permitted condition for protective measures under the external influence according to 410.3.3?

• Automatic disconnection of supply.

• Double or reinforced insulation.

• Electrical separation for the supply to one item of current-using equipment.

• Use of non-insulated equipment.

What is the commonly used protective measure in electrical installations?

• Reinforced insulation.

• Extra-low voltage (SELV and PELV).

• Automatic disconnection of supply.

• Manual disconnection of supply.

According to Section 410.3.5, who is allowed to use the protective measures specified in Section 417?

• Any person

• Skilled persons only

• Skilled persons or persons under the supervision of skilled persons

• Unskilled persons

What can be omitted for fault protection according to 410.3.9?

• Metal supports of overhead line insulators attached to the building and out of arm's reach

• All exposed-conductive-parts

• Basic insulation of live parts

• Supplementary bonding connections

What is NOT a requirement for basic protection as per 411.2?

• Compliance with one of the provisions for basic protection described in Section 416

• Use of Class II equipment

• Automatic disconnection of supply

• Protective earthing

What does an RCM produce when a preselected value of residual current is reached, as noted in the NOTE under 411.1?

• A visual signal only

• An audible signal only

• Both an audible and visual signal

• A physical disconnection of the circuit

Which of the following is NOT listed as an example of extraneous-conductive-parts in Regulation 411.3.1.2?

• Metallic water installation pipes

• Metallic gas installation pipes

• Overhead metallic structural parts of the building

• Plastic water installation pipes