Class 2 power supplies must meet the National Electric Code (NEC) and Underwriters Laboratories (UL 1310) standards for wiring requirements and power limitations of AC/DC power supplies to minimize shock or fire risks. All Class 2 power supplies must meet the NEC overcurrent protection and wiring sizing regulations. They must be constructed with ‘In-Wall’ rated wiring for permanent installation inside walls or floors, where they may be surrounded by insulation. These wiring requirements help prevent cracking or melting of the wire, which could cause a fire hazard. These power supplies must have a maximum power capacity of 100 VA and cannot exceed a 30 VAC or 60 VDC output, minimizing the risk of electric shock or overheating from excessive currents.
Class II power supplies must follow the International Electrotechnical Commission IEC 61439-1 design. This code details that Class II power supplies must have two layers of insulation between the user and the internal current-carrying components to protect the user from electrical shock. The initial layer is "basic" insulation. The second double layer is a reinforcement layer that eliminates the need for a protective earth connection (earthing) or a ground connection since the power supply is grounded within the product's casing.
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