4-4
IM CW240E
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Installation Category (CAT.)
The installation category of the CW240 is III.
II
III
IV
CAT.II
CAT.III
CAT.IV
Instrallation
Category
Applies to electrical equipment wihch is supplied form the
fixed installation like distribution board.
Applies to electrical equipment which is power-supplied from
a cable way ranging from the primary stage and branch point
of equipment directly introducing electricity form a distribution
board to the wall outlet.
Applies to electrical equipment which is power-supplied form
a cable way ranging from the entrance cable of a building to
a primary overcurrent protection.
Description
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Pollution degree
The pollution degree of CW240 is 2.
“Pollution degree” describes the degree to which a solid, liquid, or gas which
deteriorates dielectric strength or surface resistivity is adhering.
“2” applies to normal indoor atmosphere. Normally, only non-conducitve
pollution occurs. Occasionally, however, temporary conductivity caused by
condensation must be expected.
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Level Location
Do not install the CW240 in an unstable or inclined location. Otherwise, it may
fail to achieve precision measurements.
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Do not install the CW240 in a location that is:
• exposed to direct sunlight or close to a heat source,
• close to a noise source such as high-voltage equipment or a motive power
supply,
• exposed to a relatively large amount of lampblack, steam, dust, corrosive
gas,
• exposed to frequent mechanical vibration,
• close to a source of strong electromagnetic fields, or
• unstable.
WARNING
• When using multiple CW240s, provide a space of at least 10 mm between the
meters.
• If the CW240 is installed in a switchboard, etc., provide a space of at least
10 mm from the wall. Also, provide space for wiring sections of terminals, etc.
in consideration of protrusions such as plugs.
4.3 Installing the CW240