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Overvoltage Installation Categories
These definitions were derived from the international safety standard for insulation
coordination as it applies to measurement, control, and laboratory equipment. These
overvoltage categories are explained in more detail by the International Electrotechnical
Commission; refer to either of their publications: IEC 1010-1 or IEC 60664.
Overvoltage Category I
Signal level. Electronic and telecommunication equipment, or parts thereof. Some examples
include transient-protected electronic circuits inside photocopiers and modems.
Overvoltage Category II
Local level. Appliances, portable equipment, and the circuits they are plugged into. Some
examples include light fixtures, televisions, and long branch circuits.
Overvoltage 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.
Overvoltage 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.
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Страница 13: ...DM 100 DM 110 13 Typical Measurements Voltage Measurement Current Measurement ...
Страница 14: ...14 Typical Measurements cont d Resistance Measurement Continuity Check ...
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Страница 36: ...36 Mediciones más comunes Medición de tensión Medición de corriente ...
Страница 37: ...DM 100 DM 110 37 Mediciones más comunes continuación Medición de resistencia Verificación de continuidad ...
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Страница 60: ...60 Mesures types Mesure de la tension Mesure du courant ...
Страница 61: ...DM 100 DM 110 61 Mesures types suite Mesure de la résistance Vérification de la continuité ...
Страница 62: ...62 Mesures types suite Mesure de la capacité Mesure des diodes Polarisation Directe Polarité Inversée ...
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