Installation Guide

10 | nVent.com/RAYCHEM
2 HEATING CABLE SELECTION
The design of electrical resistance heat tracing systems
shall be overseen by persons knowledgeable of heat tracing
following the design methodology for explosive atmospheres as
specified by the manufacturer.
Check the design specification to make sure the proper
heating cable is installed on each pipe or vessel. Refer to nVent
product literature and the TraceCalc software to select the
proper heating cable for each thermal, chemical, electrical and
mechanical environment.
Heat tracing system design documentation
The heat tracing system documentation shall be retained for
each heat tracing circuit for as long as the system is in use.
3 HEATING CABLE INSTALLATION
Persons involved in the installation and testing of electric
heat tracing systems shall be suitably trained in all special
techniques required. Installation shall be carried out under the
supervision of a qualified person
De-energise all power circuits before installation or servicing
The insulation resistance of the heating cable shall be
measured and recorded after installation and shall not be less
than 1000 Megaohms
3.1 Heating cable storage
• Keep ends of heating cable and kit components dry before
and during installation
• Temperature range: –40°C to +60°C
• Protect the heating cable from mechanical damage
3.2 Pre-installation checks
Check materials received:
• Review the heating cable design and compare the list of
materials to the catalogue numbers of heating cables and
electrical components received to confirm that proper
materials are on site. The heating cable type is printed on its
outer jacket.
• Temperature exposure must not exceed that specified in
nVent product literature. Exceeding these limits will impair
product performance. Check that expected exposure is
within these limits.
• Ensure that the heating cable voltage rating is suitable for
the service voltage available.
• Do not energize cable when it is coiled or on the reel.
• Inspect heating cable and components for in-transit
damage. An insulation resistance test (see section 8) on
each reel is recommended.