Process area:
     - Complex pipework
     - Small vessels
     - Multitude of sensitive instruments
     - Small temperature window
     - Typically a lot of maintenance in these areas
     - Short circuit lengths
     Transfer lines:
     - Long circuit lengths required
     - from limited power supply points
     - Larger temperature window
     - Less maintenance-intensive
     Storage vessels:
     - High power requirements (heat up)
     - Less maintenance-intensive
     Reactors :
     - High temperature resistance capabilities
     - High power requirements, usually during start up