RCDD · Question #85
On a survey of one of your client's buildings, you discover that one of the TRs, housing a considerable quantity of switching equipment, is at 25 degrees C (77 degrees F) with a relative humidity of 5
The correct answer is C. Normal temperature and high humidity. A TR at 25 degrees C falls within the accepted temperature range, but 59 percent relative humidity exceeds the recommended maximum of approximately 55 percent, making it a high humidity condition.
Question
On a survey of one of your client's buildings, you discover that one of the TRs, housing a considerable quantity of switching equipment, is at 25 degrees C (77 degrees F) with a relative humidity of 59 percent. This is considered to be:
Options
- AWithin the normal range of temperature and humidity
- BHigh temperature and normal humidity
- CNormal temperature and high humidity
- DHigh temperature and high humidity
How the community answered
(57 responses)- A9% (5)
- B2% (1)
- C84% (48)
- D5% (3)
Why each option
A TR at 25 degrees C falls within the accepted temperature range, but 59 percent relative humidity exceeds the recommended maximum of approximately 55 percent, making it a high humidity condition.
While the temperature is within the normal range, 59 percent relative humidity exceeds the recommended upper limit of approximately 55 percent, so conditions are not entirely within the normal range.
25 degrees C falls squarely within the accepted temperature range for a TR, so it cannot be classified as high temperature.
The accepted temperature range for a telecommunications room is typically 18 to 27 degrees C (64 to 81 degrees F), so 25 degrees C is within normal limits. However, the recommended relative humidity range is approximately 30 to 55 percent, meaning 59 percent exceeds the upper threshold and is classified as high humidity. Excess moisture at this level risks corrosion and condensation on active switching equipment.
The temperature of 25 degrees C is within the accepted normal range, so the high-temperature classification does not apply here.
Concept tested: TR environmental temperature and humidity standards
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