ELEKTRA SelfTec PRO 10, Installation Manual

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For protection of self-regulating heating cables, it is recommended to use
circuit breakers with type C characteristics.
Because of the inrush current which can significantly exceed the nominal
current value, max. lengths of the heating circuits should comply with the
lengths given in table 2. The values have been assessed for the min.
ambient temperature.
4. General information
Protecting pipelines against freezing
When protecting pipelines against freezing, or when maintaining agent
temperature, it is necessary to estimate the value of heat output per
1 metre of the pipeline of a particular diameter. The heat output should
balance heat losses of the pipeline. The heat losses depend from local
climate conditions, i.e.:
• min. ambient temperature,
• thickness of insulation mounted on the pipeline,
• the value of maintained temperature (in case of protection water
pipelines against freezing, +5°C is assumed).
Note:
Each heated pipeline must be equipped with thermal insulation.
Installation of heating cables should commence after hydraulic
pressure tests have been concluded.
10
Installation Manual Self-regulating Heating Cables
® ELEKTRA SelfTec PRO