Comparison Between NEMA Enclosure
Type Numbers
and IEC Enclosure Classification Designations |
IEC Publication 60529 Classification
of Degrees of Protection Provided by Enclosures provides a
system for specifying the enclosures of electrical equipment
on the basis of the degrees of protection provided by the enclosure.
IEC 60529 does not specify degrees of protection against mechanical
damage of equipment, risk of explosions, or conditions such
as moisture (produced for example by condensation), corrosive
vapours, fungus, or vermin.
The NEMA Standard for Enclosures for Electrical Equipment does
test for environmental conditions such as corrosion, rust,
icing, oil, and coolants. For this reason, and because the
test and evaluations for other characteristics are not identical,
the IEC Enclosure Classification Designations cannot be exactly
equated with the enclosure Type numbers in this standard. The
IEC designations consists of the letters IP followed by two
numerals.
The first characteristic numeral indicates the degree of protection
provided by the enclosure with respect to the persons and solid
foreign objects entering the enclosure.
The second characteristic numeral indicates the degree of protection
provided by the enclosure with respect to the harmful ingress
of water. Table A -1 provides an equivalent conversion for
the enclosure Type Numbers in this standard to the IEC Enclosure
Classifications Designations.
The enclosure type numbers meet or exceed the test requirements
for the IEC classification; for this reason Table A -1 cannot
be used to convert from IEC Classifications to enclosure Type
numbers. |
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