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Humidity regulating plate in distribution box

A humidity regulating plate, or anti-condensation sheet, controls moisture inside distribution boxes by absorbing and releasing water vapor, preventing condensation and corrosion without electricity.Function and Importance

Humidity regulating plates, often called Humidity Control Sheets, are designed to "breathe," absorbing excess moisture when humidity rises and releasing it when humidity drops, maintaining a stable internal environment in electrical enclosures . This prevents condensation, which can cause corrosion, short circuits, and equipment failure even in waterproof or sealed boxes . Condensation typically occurs when warm, moisture-laden air contacts cooler surfaces, and even small temperature differences can trigger water droplets inside the box .

Types of Humidity Control Solutions
  1. Humidity Control Sheets:
    • Passive, ecological, and maintenance-free.
    • Absorb and desorb moisture repeatedly over long periods (up to 10 years in some cases).
    • Thin and lightweight, suitable for small or curved enclosures.
    • No electricity required, reducing operational costs .
  2. Electronic Hygrostats with Heaters:
    • Devices like the EFR-012 monitor relative humidity and activate a heater when it exceeds a set threshold (e.g., 65%) to prevent condensation .
    • Provide precise control with low hysteresis, ideal for sensitive or high-value equipment.
  3. Self-Regulating Enclosure Heaters:
    • Use a semi-conducting polymer core to generate heat proportionally to temperature, preventing overheating .
    • Suitable for hazardous or Ex e enclosures, ensuring internal temperature remains adequate.
  4. Pressurization and Purge Systems:
    • Maintain slightly higher internal pressure to prevent moisture ingress.
    • Often combined with ventilation or purge units to replace internal air with dry or inert gas .
    • Effective in environments with fluctuating temperature and humidity.
Advantages of Using Humidity Regulating Plates
  • Energy-efficient: No electricity needed.
  • Long-lasting: Maintains performance over years without maintenance.
  • Versatile: Can be installed in various enclosure sizes and shapes.
  • Protective: Reduces corrosion, electrical leakage, and equipment downtime.
Application Considerations
  • Choose the size and type of sheet based on the volume of the enclosure and environmental conditions.
  • For extreme humidity or outdoor installations, combining sheets with heaters or pressurization systems can provide layered protection .
  • Regular inspection ensures the sheet or system continues to function effectively, especially in critical infrastructure. In summary, a humidity regulating plate is a passive, reliable solution to control moisture in distribution boxes, complementing or replacing active heating or pressurization systems depending on the application and environmental conditions .
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Technical note

This reference is intended for preliminary specialty-cable research. Compatibility, link budgets, fire performance, installation methods, test limits and applicable standards must be verified for the specific project.

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