AS 60034.5:2009 – Rotating electrical machines Part 5: Degrees of protection providedby the integral design of rotating electrical machines (IP Code)—Classification.
The lower degree of protection of
— guards for external tans (as allowed in 4 3);
— drain holes (as allowed in 4.4),
need not be specified on the rating plate or in the documentation
Where the mounting of the machine has an influence on the degree of protection, the intended mounting arrangements shall be indicated by the manufacturer on the rating plate or in the instructions for mounting
7 General requirements for tests
The tests specified in this standard are type tests They shall be carried out on standard products or models of them. Where this Is not feasible verification either by an alternative test or by examination of drawings shall be the subject of an agreement between manufacturer and user
Unless othei’wise specified, the machine for each test shall be clean With all the parts In place and mounted in the manner stated by the manufacturer.
In the case of both first and second characteristic numerals 1. 2. 3 and 4, a visual inspection may, in certain obvious cases. show that the intended degree of protection is obtained In such cases, no test need be made However, in case of doubt, tests shall be made as prescribed in clauses 8 and 9.
7.1 Adequate clearance
For the purpose 01 the following test clauses in this standard, the term ‘adequate clearance’ has the meaning given in 7.1.1 or 7.1.2.
7.1.1 Low-voltage machines (rated voltages not exceeding 1 000 V a.c. and 1 500 V d.c.)
The test device (sphere, finger, wire, etc.) does not touch the live parts or moving parts other than non-dangerous parts such as smooth rotating shafts.
7.1.2 High-voltage machines (rated voltages exceeding 1 000 V a.c. and 1 500 V d.c.)
When the test device is placed in the most unfavourable position, the machine shall be capable of withstanding the dielectric test applicable to the machine.
This dielectric test requirement may be replaced by a specified clearance dimension in air which would ensure that this test would be satisfactory under the most unlavourable electrical field configuration.
8 Tests for first characteristic numeral
Test and acceptance conditions for the first characteristic numeral are given in table 4.
The dust test for numerals 5 and 6 shall be performed with the shaft stationary, provided that the difference in pressure between running and stationary (caused by fan effects) is lower than 2 kPa If the pressure difference is greater than 2 kPa. the internal machine pressure during the dust test shall be depressed accordingly Alternatively, the machine may be tested with the shaft rotating at rated speed.
9.2 Acceptance conditions
After the test In accordance with table 5 has been carried out, the machine shall be inspected for ingress of water and subjected to the following verification and tests
9.2.1 The amount of water which has entered the machine shall not be capable of interfering with its satisfactory operation The windings and live parts not designed to operate when wet shall not be wet and no accumulation of water which could reach them shall occur inside the machine.
It is, however, permissible for the blades of fans inside rotating machines to be wet and leakage along the shaft is allowable if provision is made for drainage of this water
9.2.2 In the case of a test on a machine not running:
a) the machine shall be operated under no-load conditions at rated voltage for 15 mm,
b) men be submitted to a withstand voltage test, the test voltage being 50 % of the test voltage for a new machine (but not less than 125 % of the rated voltage)
In the case of a test on a running machine, only the withstand voltage test is made, in accordance with item b) above.
The test Is deemed satisfactory if these checks show no failure.
10 Requirements and tests for open weather-protected machines
The degree of protection W is intended for air-cooled open machines with open circuit cooling. that is. machines with cooling systems designated by CDX to IC3X according to IEC 60034-6.
Weather-protected machines shall be so designed that the ingress of rain, snow and airborne particles into the electrical parts is reduced
Other measures providing weather protection (such as encapsulated windings or total enclosure) are not designated by W
Machines with degree of protection W shall have ventilation passages constructed such that.