Socket-outlets shall not be permitted in equipment intended for connection by flexible cord
except in the following circumstances:
(a) Where specifically accepted by an approvals authority in those cases where there is little
likelihood of cascading of similar equipment which could result in circuit overloading and
extension of fault conditions.
(b) Where permitted by an individual Approval and test specification or by National Wiring
Rules.
(c) Where the equipment is basically providing a switching or control function.
This does not preclude the use of socket-outlets or other facilities for connections within the
equipment.