Power adapter provides output power limit of less than 15W

This output power level allows system compliance to the IEC 62368-1 standard, clause 6.2.2, for a PS1 energy source.

Compliance with this clause eliminates system level risk mitigation techniques required by the standard for higher output power PS2 and PS3 energy sources.

The IEC 60601-1 medical equipment standard, clause 13.1, allows products powered by power sources with less than 15W to eliminate the need for a flame retardant fire enclosure/housing for the medical product

Background
According to IEC62368-1 Electrical sources of heating can be classified into available power levels PS1, PS2 and PS3 that may cause resistive heating of both components and connections. These power sources are based on available energy to a circuit.

Within a power source, a potential ignition sources (PIS) may arise due to arcing of either broken connections or opening of contacts (arcing PIS) or from components dissipating more than 15W (resistive PIS).

Depending on the power source classification of each circuit, one or more safeguards are required either to reduce the likelihood of ignition or to reduce the likelihood of spread of fire beyond the equipment.

To reduce the likelihood of injury or property damage due to an electrically-caused fire originating within the equipment, equipment shall be provided with the safeguards specified in Clause 6.