Remote fault/smoke detection for motor control centers

Reports have indicated, in some cases, that smoke detectors had not been triggered, even though smoke was evident. Smoke from electrical equipment was billowing out from under the doors of the switchgear rooms and still no alarm was given. Discussions were held to determine why the pendant-mounted smoke detectors had not been triggered, and how improved monitoring could be attained. The authors describe the research and testing of the use of smoke detectors installed directly inside low-voltage motor control centers. They address the reasons why the use of externally mounted (such as ceiling, pendant, or low-evaluation) smoke detectors, are not adequate in detecting smoldering or burning electrical insulation.<>