Q: What is the Difference Between IEC Class I and Class II Input?

IEC Class I input models have basic insulation and must incorporate a protective earth (ground) connection to mitigate the risk of electric shock. IEC Class II input models feature additional safety precautions such as double insulation or reinforced insulation, thereby eliminating the need for a protective earth (ground) connection. Therefore, Class II input power supplies have a 2-pin input receptacle [IEC60320 C8 or C18 type] instead of the 3-pin input receptacles found on Class I input models.

Question 1

What's the Difference Class 2 vs Class II?

Accepted Answer

Understandably, there is sometimes misunderstanding about the distinction between Class 2 and Class II rated ac-dc power supply. The distinctions are crucial and must be understood. The NEC (National Electric Code) designation of Class 2 relates to the output voltage and power capabilities of ac-dc supplies, while the IEC (International Electrotechnical Commission) protection designator, Class II, refers to the internal architecture and electrical insulation of a power supply.

Question 2

What is the Difference Between IEC Class I and Class II Input?

Accepted Answer

IEC Class I input models have basic insulation and must incorporate a protective earth (ground) connection to mitigate the risk of electric shock.
IEC Class II input models feature additional safety precautions such as double insulation or reinforced insulation, thereby eliminating the need for a protective earth (ground) connection. Therefore, Class II input power supplies have a 2-pin input receptacle [IEC60320 C8 or C18 type] instead of the 3-pin input receptacles found on Class I input models.

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Class I vs Class II vs Class III, or Class 1 vs Class 2

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