AMETEK CTS 3.0 - Manual (Page 113)

User Manual Compliance Test System 3.0
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The user may create as many test files as desired using the data entry grid. Changes made can
be saved using the File, Save A
s… menu entry.
9.5 Test Levels
In Annex B of the draft standard, the EUT operating environment classifications are defined based
on IEC 1000-2-4. The classifications are as follows:
Class Environment
Class 1 Applies to protected supplies with compatibility levels lower than public network
levels. It relates to the use of equipment, which is very sensitive to disturbances in
the power supply, for instance the instrumentation of technological laboratories,
some automation and protection equipment, some computers etc. This equipment is
normally supplied by protected supplies such as uninterruptible power supplies, filers
or surge suppressors.
Class 2 Applies to points of common coupling (PCCs for consumer systems) and in-plant
points of common coupling (IPCs) in the industrial environment in general. The
compatibility levels in this class are identical to those of public networks.
Class 3 Applies only to IPCs in industrial environments. It has higher compatibility levels than
those of class 2 for some disturbance phenomena. This class should be considered
when any of the following conditions are met:
- a major part of the load is fed through converters
- welding machines are present
- large motors are frequently started
- loads vary rapidly
Test levels are specified for class 2 and 3 only. Class X test levels may be defined by specific
product standards.
Environment Class Unom (Nominal Voltage) Unom + 10 % Unom - 10 %
Class 1 no test required no test required no test required
Class 2 ± 8 % Unom - 8 % Unom + 8 % Unom
Class 3 ± 12 % Unom -12 % Unom + 12 % Unom
Class X Open but must be higher
than Level 2 Open but must be
higher than Level 2 Open but must be
higher than Level 2