Chapter 2 Installing Compact FieldPoint Hardware and Software
© National Instruments Corporation 2-3 cFP-20xx and cFP-BP-x User Manual
Operate the product only at or below Pollution Degree 2. Pollution is
foreign matter in a solid, liquid, or gaseous state that can reduce dielectric
strength or surface resistivity. The following is a description of pollution
degrees:
• Pollution Degree 1 means no pollution or only dry, nonconductive
pollution occurs. The pollution has no influence.
• Pollution Degree 2 means that only nonconductive pollution occurs in
most cases. Occasionally, however, a temporary conductivity caused
by condensation must be expected.
• Pollution Degree 3 means that conductive pollution occurs, or dry,
nonconductive pollution occurs which becomes conductive due to
condensation.
Caution You must insulate signal connections for the maximum voltage for which the
Compact FieldPoint product is rated. Do not exceed the maximum ratings for the product.
Do not install wiring while the product is live with electrical signals. Do not remove or add
connector blocks when power is connected to the Compact FieldPoint system. Avoid
contact between your body and the connector block signal wiring when hot-swapping
modules.
Operate Compact FieldPoint products at or below the installation category
1
marked on the hardware label. Measurement circuits are subjected to
working voltages
2
and transient stresses (overvoltage) from the circuit
to which they are connected during measurement or test. Installation
categories establish standard impulse withstand voltage levels that
commonly occur in electrical distribution systems. The following is a
description of installation categories:
• Installation Category I is for measurements performed on circuits not
directly connected to the electrical distribution system referred to as
MAINS
3
voltage. This category is for measurements of voltages from
specially protected secondary circuits. Such voltage measurements
include signal levels, special equipment, limited-energy parts of
equipment, circuits powered by regulated low-voltage sources, and
electronics.
• Installation Category II is for measurements performed on circuits
directly connected to the electrical distribution system. This category
refers to local-level electrical distribution, such as that provided by a
1
Installation categories, also referred to as measurement categories, are defined in electrical safety standard IEC 61010-1.
2
Working voltage is the highest rms value of an AC or DC voltage that can occur across any particular insulation.
3
MAINS is defined as a hazardous live electrical supply system that powers equipment. Suitably rated measuring circuits may
be connected to the MAINS for measuring purposes.
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