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Power Certification & Symbols

Certification Labels

cETL is a mark designating that a product has met certain electrical safety standards, as certified by Intertek. cETL is recognized in Canada and the United States.

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cUL is another certification of safety standards. It is managed by Underwriters Laboratories of Canada (ULC), an independent product safety testing, certification and inspection organization.

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This symbol denotes a UL component, meaning that the unit is certified, but it also needs a separately certified enclosure. Not only must the enclosure be certified, it must be certified for this specific component.

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The CSA symbol represents approval by another standards agency, based in Canada and recognized in Canada and/or the United States.

Class 2

Class 2 status means that a power supply will not deliver more power than it is rated to provide. For example, if you load a 90 watt Class 2 power supply with 200 watts of LED strip, the power supply will only put out 90 watts. Class 2 is important for safety and power supply longevity since the power supply can only give what it is rated to give and won’t burn itself out if over-driven.

Limited Power Source (LPS)

LPS and Class 2 are functionally equivalent. Both ensure that the power supply has a limited voltage and current output, for safety purposes. Because they are different certification standards, there is a lot of overlap in their definitions.

Double Insulation (Class II)

Class II and Class 2 often get confused, but they focus on very different aspects of power supplies. Class II designation means that the power supply relies not only on simple electrical insulation, but 2 layers (or a single reinforced layer) of insulation, and therefore does not require an earth ground connection. This is why on Class II power supplies, there is no ground pin on the input.