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Measurement Categories
These definitions were derived from the international safety standard for insulation coordination as it
applies to measurement, control, and laboratory equipment. These measurement categories are explained
in more detail by the International Electrotechnical Commission; refer to either of their publications: IEC
61010-1 or IEC 60664.
Measurement Category I
Signal level. Electronic and telecommunication equipment, or parts thereof. Some examples include
transient-protected electronic circuits inside photocopiers and modems.
Measurement Category II
Local level. Appliances, portable equipment, and the circuits they are plugged into. Some examples
include light fixtures, televisions, and long branch circuits.
Measurement Category III
Distribution level. Permanently installed machines and the circuits they are hard-wired to. Some
examples include conveyor systems and the main circuit breaker panels of a building's electrical system.
Measurement Category IV
Primary supply level. Overhead lines and other cable systems. Some examples include cables, meters,
transformers, and other exterior equipment owned by the power utility.
Statement of Conformity
Greenlee Textron Inc. is certified in accordance with ISO 9000 (2000) for our
Quality Management Systems.
The instrument enclosed has been checked and/or calibrated using equipment that is traceable to
standard ISO/IEC 17025 and is accredited by DKD Germany.
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