One enquiry I am oftentimes asked is: “The client is looking for a Class 2 ability supply; what tin y'all offering him?”
My reply is ever “Class 2” or “Class II (with Roman numerals)”, or both? The interruption on the terminate of the band signifies an explanation is inwards order.
Class 2 is a classification referring to the NEC – National Electric Code. To avoid potential cable overheating due to excessive currents in addition to electrical shock, the output of the ability render is express to 60VDC or 100VA, (100W when used amongst an AC-DC ability supply). You volition often run across 24V output DIN track ability supplies or LED drivers rated at 91W rather than 100W because if the ability render is overloaded, whatever tolerance inwards the over electrical flow protection has to live on accounted for.
Often these products volition live on certified to UL1310 in addition to volition listing this inwards the datasheet. An event of this is TDK-Lambda’s DSP series. You tin run across from the model selector listing on page 2 of the DSP datasheet that output currents of 4.2A or greater are non approved to UL1310.
Class II (with Roman numerals) refers to ability supplies amongst either a double or reinforced insulation barrier betwixt the input in addition to the output. Class II supplies create non rely on an globe connexion to protect against stupor hazard. Many prison theatre mobile telephone band chargers in addition to laptop ability supplies are Class II. TDK-Lambda’s DSP serial too are Class II, having simply a Line in addition to Neutral air-conditioning input without a dry reason connection.
H5N1 Class II ability render rating label volition exhibit this symbol:
One wages of Class II is amend surge protection betwixt input in addition to dry reason in addition to commonly a lower globe leakage current.
For to a greater extent than information virtually leakage current, delight run across unopen to other article virtually power render leakage electrical flow testing.

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