Thermon Electric Heat Tracing - Manual (Page 3)

Electric Heat Tracing
2
Site Practice . . .
1. Provide protective clothing, and other protective
equipment needed to isolate employees from potential
arc fl ash and shock hazards identifi ed in the analysis.
2. Provide training to employees for understanding the
purpose/function of the electrical heat tracing and the
electrical power supply/control equipment. In addition,
how to recognize and avoid the hazards associated with
operation and maintenance.
3. Apply safe work practices including the following:
• Identify the circuit or equipment to be de-energized and
all possible sources of electrical energy supplies to the
specfi c circuit or equipment.
• Disconnect both legs of the power supply cable at the
circuit breakers, disconnect switches, and any other
applicable points.
• Apply lockout/tagout devices according to established
procedures.
• Visually verify that the circuit disconnect devices are
open prior to connecting power cable to heat tracers.
• Test for absence of voltage with an approved voltmeter
(where the voltmeter is tested on a known circuit voltage
prior to and immediately following application).
• For protection against accidental energizing of supply
conductors, apply temporary jumpers rated for the
available fault duty between each supply conductor and
earth/ground.
Illustration A: Typical Heat Tracing Installation
Notes . . .
1. Refer to Page 1 for cable types and approval.
2. Illustration depicts a typical self-regulating heating circuit.
3. Temperature control is recommended for all freeze protection and temperature
maintenance heat tracing applications.
4. All heat-traced lines must be thermally insulated.
5. Refer to Thermon form number PN50273U for installation instructions for MI
heating cable.
The following installation procedures are for the installation
of a Thermon electric heat tracing system
1 . The installation
must comply with Thermon requirements and be installed
in accordance wit the regulations as per standard EN-IEC
60079-14 and EN-IEC 60079-30-2 for hazardous areas
(where applicable), and any other applicable national and
local electric codes.
Individuals installing these products are responsible for
complying with all applicable safety and health guidelines.
Proper personal protective equipment, or PPE, should be
utilized during installation. Contact Thermon if you have
any additional questions.
Applications . . .
1. Electric heat tracing cables are used for freeze protection
or temperature maintenance of piping, tanks and
instrumentation. This set of instructions covers typical
piping applications. For installation details on tanks and
instrumentation, refer to the Installation Guides on our
website www.thermon.com.
2. Heat tracing cables may be installed in ordinary
(nonclassifi ed) and hazardous (classifi ed) locations
depending on the specifi c cable options and approvals
1 .
8
5
4
6
5 a
1
2
3
7
Complete Electric Heat Tracing System . . .
A complete electric heat tracing system may typically include
the following components
2 :
1. Electric heat tracing cable 1, 5 (self-regulating, power-
limiting, parallel constant watt or series constant watt).
2. Power connection kit.
3. RTD sensor or control thermostat
3 .
4. In-line/T-splice kit (permits two or three cables to be
spliced together).
5. Cable end termination.
5
a . End of circuit light kit.
6. Attachment tape (use on 30cm intervals or as required by
code or specifi cation).
7. “Electric Heat Tracing” label (peel-and-stick label attaches
to insulation vapor barrier on 3m intervals or as required
by code or specifi cation).
8. Thermal insulation 4 and vapor barrier (by others).
The absence of any of these items can cause a system to
malfunction or represent a safety hazard.