True RMS Digital Multimeters
Specifications
45
Table 25. Certifications and Compliances (cont.)
Category Standards or description
Installation Category
DUAL RATINGS
Complies with IEC 1010-1 to 1000 V Overvoltage
Category III, Pollution Degree 2; and IEC 664-1 to
600 V Overvoltage Category IV, Pollution Degree 2
OVERVOLTAGE (Installation) Categories refer to the
level of Impulse Withstand Voltage protection provided
at the specified Pollution Degree.
• Overvoltage Category III equipment is equipment
in fixed installations. Examples include switch
gear and polyphase motors.
• Overvoltage Category IV equipment is equipment
for use at the origin of the installation. Examples
include electricity meter and primary over-current
protection equipment.
Pollution Degree A measure of the contaminates that could occur in the
environment around and within a meter. Typically the
internal environment inside a meter is considered to
be the same as the external. Meters should be used
only in the environment for which they are tested.
Pollution Degree 2 Normally only dry, nonconductive pollution occurs.
Occasionally a temporary
conductivity that is caused by condensation must be
expected. This location is a typical office/home
environment. Temporary condensation occurs only
when the meter is out of service.
Pollution Degree 3 Conductive pollution, or dry, nonconductive pollution
that becomes conductive due to condensation. These
are sheltered locations where neither temperature nor
humidity is controlled. The area is protected from
direct sunshine, rain, or direct wind.
1
Add 25 counts (250 counts in 50,000 count mode) to the accuracy
specifications when in the presence of an RF field as defined in IEC801–3.
2
Amps DC: Add 60 counts (600 counts in 50,000 count mode) to the amps
accuracy specifications when in the presence of an RF field as defined in
IEC801–3.
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