National Instruments IMAQ PCI-1407 User Manual page 20

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Mains is defined as the electricity suppy system to which the equipment concerned is designed to be connected for either
powering the equipment or for measurement purposes.
© National Instruments Corporation
Clean the device and accessories by brushing off light dust with a soft,
nonmetallic brush. Remove other contaminants with a stiff, nonmetallic
brush. The unit must be completely dry and free from contaminants before
returning it to service.
You must insulate signal connections for the maximum voltage for which
the device is rated. Do not exceed the maximum ratings for the device.
Remove power from signal lines before connection to or disconnection
from the device.
Operate this device only at or below the installation category stated in the
specifications. Installation categories are listed below.
• Installation Category IV—for measurements performed at the source
of the low-voltage (<1000 V) installation. Examples include electricity
meters, measurements on primary overcurrent protection devices, and
ripple-control units.
• Installation Category III—for measurements performed in the building
installation. Examples include measurements on distribution boards,
circuit-breakers, wiring (including cables), bus bars, junction boxes,
switches, socket outlets in the fixed installation, equipment for
industrial use, and some other types of equipment, such as stationary
motors permanently connected to the fixed installation.
• Installation Category II—for measurements performed on circuits
directly connected to the low-voltage installation. Examples include
measurements on household appliances, portable tools, and other
similar equipment.
• Installation Category I—for measurements performed on circuits not
directly connected to mains
circuits not derived from mains, and specially-protected (internal)
mains-derived circuits
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. Examples include measurements on
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Chapter 2 Installation
IMAQ PCI/PXI-1407 User Manual