C-tick is Australia's electromagnetic compatible part in Australia electromagnetic compatibility are controlled by the ACA (Australian Communications Authority), in Australia the EMC system, products are divided into three categories, suppliers in sales in the second, three categories of products must in the ACA registration using the c-tick mark.

Due to the ACMA registration using the c-tick mark applicants only registered companies in Australia or New Zealand, buyers in Australia or New Zealand or through in Australia or New Zealand by branches / partner certification application.

In Australia, the EMC of electrical products required by ACMA (Australian Communications Authority monitoring. Using the standard in addition to the Australian and New Zealand Standard (as / NZS), ACMA recently admitted 103 other standards. These standards include en (European norm) and IEC (International Electrotechical Commission and CISPR International Special Committee on radio interference).

In electromagnetic interference in order to limit the influence of Australia from 1999 January 1 onwards, all the standard range of products subject to electromagnetic interference (EMI) mandatory requirements. Part of the EMC experiment projects must also be annexed the mandatory requirements, they are: conduction interference, intermittent interference (Ka Li sound), radio frequency radiation interference; other EMC test items are not mandatory requirements, such as anti interference, electrostatic discharge (ESD), harmonics, voltage flicker. Products by inspection in accordance with the relevant standards, you can paste c-tick mark. Any company or individual to use this flag must be to the government departments to apply to obtain written approval before use, and mark the height of not less than 3 mm.

Australia's EMC system to the product is divided into three levels, the supplier in the sales level two, level three products, must be registered in the ACA, apply for the use of C-Tick logo.

A class of products: the use of wireless spectrum interference devices and low radiation products, such as manual switch, relay simple, one-way squirrel cage induction motor, resistance. For a class of products, the supplier must signed a declaration of conformity and provide product descriptions. This kind of product in the production and sales can be voluntary use c-tick the logo, but the supplier in the choice of use the logo, in the with statement and description of the book at the same time, but also to provide records of compliance with, to prove that the products described in the statement has meet the requirements of the relevant EMC standards. Test site is not required, allowing internal testing.

Two types of products: the use of radio frequency spectrum equipment to interfere with higher radiation products, such as switching power supply, welding machine, light regulator, most of the household appliances.

Three categories of products: the use of wireless spectrum jamming equipment high products that cover CISPR11 cispr22 products. Currently, communication terminal products still contained within this range, but from November 7, 2003, the end product will be divided to 2 kinds of products. Supplier in addition to must sign a declaration of conformity and provide product description of the book, but also to provide test reports issued by a recognized testing agencies. It was also issued by the QMS certification issued by the quality management system certificate.