When an officer of court serves an earnings arrestment schedule or a current maintenance arrestment schedule on the employer of the debtor he shall, if reasonably practicable, intimate a copy of the schedule to the debtor.

Failure to intimate a copy of the schedule to the debtor shall not by itself render the arrestment invalid.

Service of any such schedule shall be by registered or recorded delivery letter or, if such a letter cannot be delivered, by any other competent mode of service.

The certificate of execution of an earnings arrestment or a current maintenance arrestment shall be signed by the officer of court who effected the service.

Section 17(1) of this Act shall apply to the service of an earnings arrestment schedule, a current maintenance arrestment schedule or a conjoined arrestment order as it applies to the execution of a poinding except where such service is by post.