AS 60034.5:2009 Rotating electrical machines
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 1 5 min,
b) then be submitted to a withstand voltage test, the test voltage being 50 % of the test voltage for a new machine (but not less than 1 25 % 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 IC0X 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:
a) at both intake and discharge, high-velocity air and airborne particles are prevented from entering the internal passages leading directly to the electrical parts of the machine;
b) the air intake path, by baffling or use of separate housings, provides at least three abrupt changes in the direction of the air intake, each of which is at least 90°;
c) the air intake path provides an area of average velocity not exceeding 3 m/s, enabling any particles to settle. Removable or otherwise easy to clean filters or any other arrangement for the separation of particles may be provided instead of a settling
chamber.