(1) A supplier must ensure that the voltage harmonic distortions at the point of common coupling nearest to a customer's point of supply do not exceed the levels set out in Schedule III.

(2) Notwithstanding sub-rule (1), the supplier shall comply with the Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems, IEEE Standard 519 of 1992.

(3) A customer categorized as a bulk or industrial customer shall ensure that the voltage and current harmonic distortions in the customer's electrical system are within the limits stated in Schedules III and IV.

(4) Where it is apparent to the supplier that a customer's voltage and current harmonic distortions exceed the limits specified in Schedules III and IV, the supplier may disconnect electricity supply to the customer.

(5) The supplier must reconnect supply to the customer in accordance with sub-rule (3) of rule 38 after the customer has complied with the relevant limits.