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Damp components in the distribution box

Fiber and communications infrastructure knowledge brief Published 23 Apr 2022

Use this reference to prepare product questions for CJC FIBRE. Check interfaces, capacity, protection and installation requirements against the current product documentation.

Dampness in distribution boxes can cause condensation, corrosion, and equipment failure, but using IP-rated enclosures and proper ventilation can protect components.

Causes of Dampness

Dampness in distribution boxes typically arises from condensation, which occurs when warm, humid air contacts cooler surfaces inside the enclosure, causing water droplets to form. This can happen due to: Temperature differences between internal components (like PLCs, VFDs, transformers) and the enclosure walls. High ambient humidity, especially in coastal, rainy, or industrial environments.

Rapid temperature changes, such as moving an enclosure from a warm indoor area to a cold outdoor location. Frequent opening and closing of the enclosure, which introduces humid air from the environment. Faulty installation or poor insulation, allowing water ingress.

Even small amounts of moisture can lead to short circuits, corrosion, mold growth, and equipment failure, posing safety risks and operational downtime.

Protective Measures

To prevent dampness and protect components: Use IP-rated enclosures: Enclosures with ratings like IP65 are dust-tight and protected against water jets, making them suitable for damp rooms. Material selection: High-quality materials such as ASA (acrylic ester styrene acrylonitrile) offer better weather resistance and UV stability compared to conventional ABS. Sealing: Rubber gaskets or injected seals maintain the enclosure's protection class and prevent moisture ingress.

Ventilation: Proper ventilation, including passive vents or forced-air systems, helps regulate internal temperature and reduce condensation. Temperature control: Avoid placing enclosures near heat sources or in areas with rapid temperature fluctuations. Regular inspection: Transparent doors allow visual inspection without opening the enclosure, reducing the risk of introducing humid air.

Suitable Products

The DISBOX-F series is an example of a distribution box designed for damp environments. It features: IP65 protection for damp roomsHigh impact resistance and weather-resistant materialsTransparent doors for inspectionInjected rubber seals for consistent protectionFlexible mounting rails and terminal options SummaryDampness in distribution boxes is primarily caused by condensation due to temperature differences, high humidity, and environmental factors. Protecting components requires IP-rated enclosures, proper sealing, ventilation, and careful placement.

Using products specifically designed for damp environments, like the DISBOX-F series, ensures reliable operation and reduces the risk of equipment failure and safety hazards.

Damp components in the distribution box - CJC FIBRE CONSULTANTS [PDF]

Damp components in the distribution box

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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