International standards are published by recognised international standards organisations. New Zealand standards are often aligned with international standards. When they are, suppliers may understand your needs more clearly if you refer to the New Zealand standard rather than the equivalent international one.
New Zealand technical regulations are mandatory for goods and services for use in, and construction works located in, New Zealand. If there’s a New Zealand technical regulation that applies to the goods, services or works you are sourcing, your specifications need to be based on it.
Examples on Legislation New Zealand website:
Electricity (Safety) Regulations 2010
Building Code in Schedule 1 of the Building Regulations 1992