What is a UL Class 2 power supply?
The UL Class 2 Power Units standards apply to power supplies within a limited output current and output voltage range. The Class 2 standard is specified in UL Standard Number UL1310. In order to receive the UL Class 2 approval, the power supplies must pass UL testing as follows: The output current does not exceed 8 A.
What is a Class 2 circuit UL?
The NEC defines a Class 2 circuit as that portion of the wiring system between the load side of a Class 2 power source and the connected equipment. Due to its power limitations, a Class 2 circuit is considered safe from a fire initiation standpoint and provides acceptable protection from electrical shock.
Are all Class 2 power supplies the same?
For a power supply to be considered Class II, which is different from Class 2, it needs to follow the design laid out by the IEC (International Electrotechnical Commission). This code is necessary to protect the user from electrical shock.
Is a Class 2 Power Supply AC or DC?
The NEC (National Electric Code) identification of Class 2 refers to the output voltage and power capabilities of ac-dc supplies, while the IEC (International Electrotechnical Commission) designator of protection, Class II, refers to a power supply’s internal construction and electrical insulation.
What is UL power supply?
UL recognition is for all system components down to the board level, so a “UL Recognized” power supply will normally include components that themselves need UL recognition. These could include “X” and “Y” capacitors and any component that crosses a safety isolation barrier or whose failure could cause a hazard.
How do I know if I have a Class 2 power supply?
IEC protection Class II power supplies will have a two-wire power cord as opposed to a three-wire power cord with Safety Earth connection. Products designed with Class II insulation often are labeled as “Class II” or “double insulated” or will have the concentric square symbol on the safety label.
What is a Class 2 electrical device?
A Class II or double insulated electrical appliance is one which has been designed in such a way that it does not require a safety connection to electrical earth (ground).
How do I know if my power supply is Class 2?
What makes a class 2 PSU?
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.
What is the maximum power output of a Class 2 power supply?
The maximum power source nameplate rating for a Class 2 power supply is 100W (or 5 times Vout if the output voltage is in the range from 0 to 20Vdc). Similar requirements exist for the maximum nameplate
What are Class 2 supplies?
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.
What is UL Class 2?
The UL Class 2 Power Units standards apply to power supplies within a limited output current and output voltage range. The Class 2 standard is specified in UL Standard Number UL1310.
What is Class 2 supply?
Class 2 defines the portion of the wiring system between the load side of a Class 2 Power Supply (beginning from the outside of a cabinet or machine) and the connected equipment. (source) To be considered a Class 2, a power supply must meet the wiring requirements; gauge, insulation, derating factors.