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Is power supply PWR-18-20A class 2?
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West Coast Jones
10 miles west of Forks, WA
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June 10, 2014
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September 30, 2014 - 5:07 pm
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What is the classification of your 18 Channel 12VDC High Power CCTV Power Distribution Box, Model W-12VDC-18P/20A?

I am thinking it is class 2, but do not see the class listed on the unit.

Could make a difference in permit requirements to hook it up per L&I.

West Coast Jones
10 miles west of Forks, WA
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October 1, 2014 - 9:05 pm
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The classification I am trying to get here for SCK's power supply product # PWR-18-20A, is what fits the following:

"Class 1, 2, and 3 circuits are classified as remote-control, signaling, and power-limited circuits in the National Electrical Code (NEC). The NEC defines such circuits as that portion of the wiring system between the load side of the overcurrent protection device (OCPD) or the power-limited supply and all connected equipment".

The unit does not appear to be UL certified, but unless I am mistaken, it should/must be listed as one of the classes above?


Brad Besner
Boca Raton, Florida
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October 1, 2014 - 9:44 pm
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We do offer UL power supplies if you need them However as far as a Class 1, 2 or 3, in all my years of CCTV I have not heard of such a classification and we have dealt with thousands of inspections and that question has never been asked by an inspector. Maybe someone else on the forum will know more about the classification. 

Jose Malave
Boca Raton, Florida
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October 3, 2014 - 9:56 am
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@West Coast Jones

Are you referring to “Class 2” or “Class II (with Roman numerals)”, or both?  

Class 2 is a classification referring to the NEC – National Electric Code.  To avoid potential cable overheating due to excessive currents and electric shock, the output of the power supply is limited to 60VDC or 100VA, (100W when used with an AC-DC power supply).  You will often see 24V output DIN rail power supplies or LED drivers rated at 91W rather than 100W because if the power supply is overloaded, any tolerance in the over current protection has to be accounted for.

Often these products will be certified to UL1310 and will list this in the datasheet.  

Class II (with Roman numerals) refers to power supplies with either a double or reinforced insulation barrier between the input and the output. Class II supplies do not rely on an earth connection to protect against shock hazard.

Many cell phone chargers and laptop power supplies are Class II.

A Class II power supply rating label will show this symbol or Simply state its class in the sticker by "Class 2,Class II or Class 3":

class_ii_symbol-2.gifImage Enlarger


One advantage of Class II is better surge protection between input and ground and usually a lower earth leakage current.

The power supply that you are referring to does not have the symbol nor it has the description of "Class 2 or Class II" on the sticker. I have yet to see a non UL Power supply with this classification although it does not mean it not covering the necessary items to be a Class 2 ,Class II or Class 3. If your inspector knows the NEC code or better known as the NFPA 70 properly he should pass your inspection even if the Power Supply has no rating. States and region are different on how they choose to implement the code as well as the inspector on how much he wants to enforce it.

The only power supply that we carry that has this in its Sticker is the  PWR-AC-2450 and it is UL listed. 

PWR-AC-2450.jpgImage Enlarger

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