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ITGlossary · Protection and installation
Operating Temperature and Humidity Range
The limits of room temperature and relative humidity within which a device is designed to operate correctly.
Technical level:Basic
A typical UPS specifies operation from 0 to 40 °C and relative humidity up to 90 or 95% non-condensing. The datasheet usually also gives a separate, wider storage range, which applies only when the device is switched off.
The fact that a UPS operates at 40 °C does not mean its batteries will last. Lead-acid batteries have their best service life at around 20–25 °C, so a storeroom without air conditioning in August wears them out quickly.
The words “non-condensing” matter. If you move a UPS from a cold car or warehouse into a warm room, leave it for a few hours to acclimatise before switching it on, so that moisture on the circuits can evaporate.
Related terms
- Ambient TemperatureThe surrounding temperature of the environment where UPS or batteries are installed.
- Circuit ProtectionDevices such as fuses and circuit breakers that open the circuit on overcurrent or short circuit to prevent damage.
- Ground FaultAn unintended flow of current from a live conductor to earth or to a device’s metal casing.
- IK Rating (Impact Protection)Scale from IK00 to IK10 under IEC 62262 that shows how much impact energy the enclosure of an electrical device can withstand.
- Input Voltage WindowThe range of mains voltage within which a UPS keeps powering the load from the grid without switching to battery.
- IP Rating (Ingress Protection)Two-digit code under IEC 60529 in which the first digit shows protection against dust and solid objects and the second against water.