INTERNATIONAL ELECTROTECHNICAL COMMISSION (IEC)

IEC 60947-2 primarily concerns:

• ) Household circuit breakers

• High-voltage circuit breakers          

• Fuses

• Low- voltage circuit breakers

The rated current range for circuit breakers under IEC 60947-2 is:

• 1 A to 1000 A

• 10 A to 10,000 A

• 0.1 A to 100 A

• 0.5 A to 6300 A

IEC 60947-2 specifies testing to verify:

• Only thermal stress  

• Visual inspection only   

• Thermal and dynamic stress

• Only dynamic stress

IEC 60898-1 is relevant to:

• High-voltage systems

• Commercial buildings

• Residential applications

• Industrial settings

The rated operational voltage for circuit breakers in IEC 60898-1 is typically:

• 1500 VDC

• 230/ 400 VAC

• 1000 VAC

• 120 VAC

A crucial aspect of IEC 60898-1 compliance is ensuring:

• Global market dominance 

• Ease of installation 

• Safety through proper overload and short-circuit protection.

• High cost-effectiveness

The IP code (IEC 60529) designates:

• Rated current

• Degree of protection against solid objects and water

• Short circuit capacity

• Circuit breaker type

The "k-factor" relates to:

• Trip time

• Rated voltage

• The ratio between service and short-circuit breaking capacity

• Ambient temperature

Selectivity in circuit breaker placement is important for:

• Improving aesthetics 

• Reducing costs

• Containing faults to specific areas and preventing cascading failures.

• Simplifying maintenance

Which standard is mostly suitable for use by skilled/trained personnel:

• Both IEC 60898-1 and IEC 60947-2

• Neither IEC 60898-1 nor IEC 60947-2

• IEC 60898-1

• IEC 60947-2