1. The product volume should not exceed 25% of the equipment box volume, and the sample base should not exceed 50% of the horizontal area of the workspace.

2. If the sample size does not comply with the previous clause, the relevant specifications should specify the use of the following methods:

① The sand and dust test chamber tests representative components of the product, including components such as doors, ventilation doors, supports, sealing shafts, etc.
② Test small samples with the same design details as the original product.
③ Test the sealing part of the product separately;

Fine components of the product, such as terminals and collector coils, should be kept in place during the testing process;

The sand and dust test chamber is based on the operating conditions of the product. The product casing can be divided into two types:

1: The pressure inside the product casing may differ from the external atmospheric pressure, for example, due to differences in air pressure caused by thermal cycles during operation.
For samples with Type 1 casing, place them inside the equipment box and install them in their normal usage position. The sand and dust test box is connected to a vacuum pump to ensure that the internal pressure of the sample is lower than atmospheric pressure. For this purpose, suitable holes should be provided on the casing. If there are already drainage holes on the sample wall, the vacuum tube should be connected to that hole without the need for re drilling.

If there are more than one drainage hole, the vacuum tube should be connected to one of the holes, and the other holes should be sealed during the test.

2: The air pressure inside the sample casing is the same as the external pressure. For samples with Type 2 shells, place them in the test chamber and install them in their normal usage position. All open holes remain open. The requirements and solutions for the placement of test pieces in the equipment box.
The above are all the contents of the placement and requirements of the sand and dust test box for the test products.