Static electricity in computer and data processing rooms is usually caused by what factor?

Static electricity in computer and data processing rooms is primarily caused by low humidity. In dry environments, particularly where humidity levels drop significantly, the air cannot effectively conduct electrical charges. This enables static charges to build up on surfaces, including electronic equipment and people's bodies, creating a higher risk of electrostatic discharge (ESD) that can damage sensitive components.

Humidity levels above 40% are generally recommended to help mitigate the buildup of static electricity. When humidity is high, moisture in the air can help dissipate electrical charges by providing a conductive pathway, thus reducing the chances of static buildup. This is particularly crucial in environments with sensitive electronic equipment, where even minor static discharges can lead to malfunctions or damage.

Factors like insufficient airflow and overheating equipment may contribute to other types of problems in data processing rooms, such as thermal management issues, but they do not directly impact static electricity generation in the same way that humidity does. Therefore, low humidity stands out as the critical factor for static electricity concerns in these settings.