This Part is applicable to the classification of degrees of protection provided by enclosure for rotating electrical machines. It defines the requirements for protective enclosures that are in all other respects suitable for their intended use and which, from the point of view of materials and workmanship, ensure that the properties dealt with in this standard are maintained under normal conditions of use.
This part does not specify:
——degrees of protection against mechanical damage of the machine, or conditions such as moisture (produced for example by condensation), corrosive dust and vapour, fungus or vermin;
——types of protection of machines for use in a potentially explosive (dust, vapour) environment.
——the requirements about the installation of barrier near the enclosure just for the personal safety personal safety.
In certain applications (such as agricultural or domestic appliances), more extensive precautions against accidental or deliberate contact may be specified.
This standard gives definitions for standard degrees of protection provided by enclosures applicable to rotating electrical machines as regards the:
a) Protection of persons against contacts with or approach to live parts and against contact with moving parts (other than smooth rotating shafts and the like) inside the enclosure and protection of the machine against ingress of solid foreign objects;
b) Protection of machines against the harmful effects due to ingress of water.
This Part specifies the protection degree symbols as well as the test to examine whether the electrical machine comply with the requirements as specified in this standard.
It gives designations for these protective degrees and tests to be performed to check that the machines meet the requirements of this standard.
Foreword
1 Scope and Purpose
2 Normative References
3 Designations
4 Degrees of Protection – First Characteristic Numeral
5 Degrees of Protection–Second Characteristic Numeral
6 Marking
7 General Test Requirements
8 Tests for First Characteristic Numeral
9 Tests for Second Characteristic Numeral
10 Requirements and Tests for Open Weather-Protected Machines
This Part is applicable to the classification of degrees of protection provided by enclosure for rotating electrical machines. It defines the requirements for protective enclosures that are in all other respects suitable for their intended use and which, from the point of view of materials and workmanship, ensure that the properties dealt with in this standard are maintained under normal conditions of use.
This part does not specify:
——degrees of protection against mechanical damage of the machine, or conditions such as moisture (produced for example by condensation), corrosive dust and vapour, fungus or vermin;
——types of protection of machines for use in a potentially explosive (dust, vapour) environment.
——the requirements about the installation of barrier near the enclosure just for the personal safety personal safety.
In certain applications (such as agricultural or domestic appliances), more extensive precautions against accidental or deliberate contact may be specified.
This standard gives definitions for standard degrees of protection provided by enclosures applicable to rotating electrical machines as regards the:
a) Protection of persons against contacts with or approach to live parts and against contact with moving parts (other than smooth rotating shafts and the like) inside the enclosure and protection of the machine against ingress of solid foreign objects;
b) Protection of machines against the harmful effects due to ingress of water.
This Part specifies the protection degree symbols as well as the test to examine whether the electrical machine comply with the requirements as specified in this standard.
It gives designations for these protective degrees and tests to be performed to check that the machines meet the requirements of this standard.
Contents of GB/T 4942.1-2006
Foreword
1 Scope and Purpose
2 Normative References
3 Designations
4 Degrees of Protection – First Characteristic Numeral
5 Degrees of Protection–Second Characteristic Numeral
6 Marking
7 General Test Requirements
8 Tests for First Characteristic Numeral
9 Tests for Second Characteristic Numeral
10 Requirements and Tests for Open Weather-Protected Machines
