IEEE/AIEE 3:1942

- Superseded.


Test results and general performance
of electrical apparatus, conductors and materials
frequently are influenced by conditions such as
Temperature, Pressure, Altitude, Density and Humidity
of the surrounding air or other medium. For
comparative results, it is necessary to standardize
the conditions under which tests are made or to
which test results are corrected.
This pamphlet serves as a guide in the preparation
or revision of standards for apparatus or
materials of specific types or fields of use. If a
particular existing standard calls for other provisions,
the existing standard should be followed.
The values given are not mandatory, but are recommended
for use in preference to other values
unless there are good technical or economic reasons
for using others. The values recommended have in
general been selected to agree with well-established
practices.
Provisions are made for a great variety of conditions
and for widely different apparatus and materials,
some of which may be of practical importance
only under unusual circumstances. In any
individual standard, only those quantities of real
practical importance in the particular case should
be used. When ranges are suggested, it is generally
with the thought that acceptance tests may be made
within that range. Tests may be made outside the
range, if acceptable, and agreed upon correction
factors are available.
Preferred Numbers are suggested in many cases
where there is no established practice.