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close this bookElectrical Machines - Basic Vocational Knowledge (IBE - Deutschland; 144 pages)
View the documentIntroduction
Open this folder and view contents1. General information about electrical machines
Open this folder and view contents2. Basic principles
close this folder3. Execution of rotating electrical machines
View the document3.1. Size
Open this folder and view contents3.2. Designs
close this folder3.3. Degree of protection
View the document3.3.1. Definition
View the document3.3.2. Designation
Open this folder and view contents3.4. Cooling
Open this folder and view contents3.5. Mode of operation
View the document3.6. Heat resistance categories
Open this folder and view contents3.7. Connection designations of electrical machines
Open this folder and view contents3.8. Rotating electrical machines in rotational sense
View the document3.9. Rating plate
Open this folder and view contents4. Synchronous machines
Open this folder and view contents5. Asynchronous motors
Open this folder and view contents6. Direct current machines
Open this folder and view contents7. Single-phase alternating current motors
Open this folder and view contents8. Transformer
 

3.3.1. Definition

A machine must be protected from penetration of foreign bodies and water. Indeed, this is essential for ensuring disturbance-free operation. Contact protection provisions are also necessary in the interests of labour safety.

Degree of protection denotes a designation indicating how a rotating machine is protected from penetration of water and foreign bodies and how human beings are prevented from coming into contact with electrical conductors and rotating parts.
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