Levels of EMC Risk...
EMC risk is partitioned into group levels that are determined by the Electromagnetic Interference (EMI) risk of the product types that comprise it. The Australian and New Zealand Governments define three separate EMC compliance group levels.
Level 1...
Level 1 applies to products which have a low risk of electromagnetic interference. Level 1 product examples include: Manually operated switches or simple arrays - Brush-less squirrel cage induction motors - Rectifier diodes - Resistive heating elements.
Level 2...
Level 2 applies to products which have a medium risk of electromagnetic interference. Level 2 product examples include: Microprocessor or other clocked digital devices - A commutator or slip ring motor - Arc welding equipment - A lighting ballast - Switched mode power supplies - Lighting dimmers - Motor speed controllers - Telecommunications terminal equipment (New Zealand).
Level 3...
Level 3 applies to products which have a high risk of electromagnetic interference. Level 3 product examples include: Group two industrial scientific and medical equipment - Telecommunications terminal equipment (Australia).