This document applies in its entirety to ripple control receivers for the reception and interpretation of pulses of a single audio frequency superimposed on the voltage of the electricity distribution network and for the execution of the corresponding switching operations. In this system the mains frequency is generally used to synchronise the trans-mitter and receivers.
For receivers of other control systems that use the electricity distribution network as a transmission medium, the requirements of this document shall be applied in a appropriate manner.
By agreement between user and supplier, special receivers (as defined in Sub-Clause 2.1.1.3) need not conform with all the requirements of this Document.