Since electrical products which charge with USB outlets have become increasingly common and there are public demand for USB outlets, the CoP has included the requirements for final circuit using USB outlets to ensure the safety of USB circuit. 13A socket outlets incorporated with USB circuit shall comply with relevant requirements included in Part 2, BS 1363. If the USB circuit are not part of the circuits of the 13A socket outlets, they hall be independent of other circuits, comply with the requirements of IEC 60950-1 and use radial final circuits. Moreover, appropriate overcurrent protection (e.g. a fuse) shall be provided on the primary side of each USB circuit to further enhance the safety of USB circuit.

Source form Electrical and Mechanical Service Department.