ECP 51
ANSWER
NZECP 51:2004: Is the New Zealand Electrical Code of Practice for Homeowner/Occupier's Electrical Wiring Work in Domestic Installations.
NZECP51 allows home owners to install cabling and outlets but does NOT permit them to gain entry into the back of any switchboard enclosure. The cables must be left in the ceiling space in close proximity to the main switchboard. The placing and connection of any cable into the switchboard must be carried out by a licensed electrical worker.
From the Standard:
"The testing and certification of electrical work carried out by the owner of an electrical installation in accordance with this code must be undertaken by a licensed electrical inspector. The inspector will inspect and test the work in accordance with NZS 3019 and must include a random selection of socket-outlets and light switches and light fittings, all socket-outlets rated above 10 A, all permanently connected appliances and all fittings, electrical appliances and light fittings associated with damp locations. Upon completion, the inspector will certify and liven the work."
ECP51 can be downloaded from here
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