Can Outdoor Network Cabinets Get Rained On?

Qualified, currently in use outdoor network cabinets are specifically designed to be rainproof, but "rainproof" does not mean "unaffected by rain." Their protection capabilities have specific level limitations.

1. Core Concept: IP Protection Rating of Outdoor Network Cabinets

The rainproof capability of an outdoor cabinet is determined by its IP protection rating.
The IP rating consists of two digits:
The first digit (dustproof rating): Indicates the protection against solid foreign objects (such as dust, tools, fingers).
The second digit (waterproof rating): Indicates the protection against water.
For outdoor cabinets, we are most concerned about the second digit.

Common, qualified outdoor cabinet waterproof ratings are typically:
IPX5: Protects against water jets from nozzles, with no harmful effect from water sprayed from all directions.
IPX4: Protects against splashes of water from all directions.
An outdoor server rack marked with IP55 or similar rating is fully capable of withstanding normal rain and splashes.

2. While rainproof, the following limitations and risks must be noted

Even if the outdoor network rack itself is waterproof, the following points must be observed during installation and use:

Do not immerse for extended periods or subject to direct high-pressure water jets: Waterproof rating does not equal flood resistance. Water can still enter through door seams, vents, etc., under continuous high-pressure water impact or immersion. Never use a high-pressure water gun to clean the rack.
Sealing strips are crucial: The sealing strips (rubber strips) around the rack doors are the lifeline for waterproofing. It must be ensured that:
They are intact: No aging, cracking, deformation, or detachment.
The doors are tightly closed: After construction or maintenance, ensure the rack doors are completely closed and locked, and the sealing strips are firmly pressed in place.

Waterproofing of cable entry/exit holes: All cable entry points into the rack must be strictly sealed using waterproof connectors (gland connectors) or sealant. This is a high-risk area for water ingress. Condensation Issues: The large temperature difference between the inside and outside of outdoor server racks, coupled with the heat generated by internal equipment, can lead to condensation. While this protects against rain, the internal moisture can still damage the equipment.

Therefore, high-quality outdoor server racks typically include:
Cooling fans: for active heat dissipation.
Heats: for dehumidification in low-temperature, humid environments.
Heat exchangers or air conditioners: for precise temperature and humidity control.

3. Special Cases: Idle or Uninstalled Racks

If you are asking about outdoor network racks that are not yet installed or used and are idle, the answer is completely different.
Direct rain exposure is strongly discouraged.
The doors of idle outdoor network racks may not be fully locked, and the sealing strips may be loose.
All its interfaces and openings may not be waterproofed.
Prolonged exposure to rain allows water to easily seep in, causing internal rust and mold, damaging the rack before installation and rendering it ineffective.