Example: air traffic controller
Design, Installation and Maintenance Manual - Heat Trace
the limiter/control device. Specific requirements for controlled designs are found in heat tracing standards IEC 62395 and IEC 60079-30-1. A Zone 1 hazardous area requires a second controller (called a limiter) that requires manual re-setting. A control and monitoring system shall be used that meets the application requirements of these standards.
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