Thermon TESH - Manual (Page 6)

INSTALLATION GUIDELINES SERIES HEATING CABLES PAGE 4
THERMON...The Heat Tracing Specialists ®
TEP0118U-1111
Installation sequence of a heat tracing system
Ensure that all piping, instruments and equipment to be 1.
traced is completely installed, tested and released.
Equipment surfaces should be clean. Any loose scale, 2.
oil or rust should be removed. Sharp edges should be
avoided.
Coating on pipes must be dry before heating cable is 3.
installed.
Determine which heating circuits can be made from 4.
which reels (make a reel schedule if applicable). Install
the correct heating cable lengths as indicated in the
design. Any deviation from these lengths will result in
a change in output and current! In most cases series
heating cable is supplied by Thermon at the designed
length.
Start - if possible - to install the long heating circuits 5.
first.
Take the correct reel for the line to be traced. If the 6.
required length of heating cable has been determined,
the connection between the cold lead cable to the
heating cable can already be made in the workshop (if
applicable).
A power termination in a junction box or thermostat 7.
with (TES only) or without non-metallic expediter can
be installed to the heating cable in the work shop.
See table 7.1 for further information about non-
metallic expediter. The maximum allowed heat output
is 16 W/m for which the TES cable can be directly
terminated in the junction- or thermostatbox. Above
this wattage use a cold lead connector. MI cable must
always be provided with cold lead connectors.
After installation in junction- or thermostatbox, the 8.
heating cable can be meggered. Megger conductor to
the braid on both sides of the cable with a 500 - 2500
Vdc test voltage for TES and 1000 Vdc for MI conform
the local electrical board. The measured insulation
resistance shall not be less than 50 MΩ.
Caution:
- In case electronic thermostats are used in the
system, disconnect them before meggering the
heat tracing system.
- The loop resistance of the heating cable circuit
must be measured.
Mount the junction- or thermostatbox on the pipe. 9.
For horizontal pipes it is recommended to mount the
junction- and thermostatbox with non-metallic expediter
in an upright position. If a junction- or thermostatbox
with non-metallic expediter is mounted horizontal or
on the bottom side of a pipe, moisture can accumulate
on the grommet inside the non-metallic expediter.
To prevent this, the knock-out hole must be opened
for draining purposes. Open one hole at horizontal
mounting and all holes at the bottom side mounting.
Ensure that the junction- or thermostatbox is not
mounted too close to pipe mounted fittings, since the
outside diameter of the insulation can be such that the
junction- or thermostatbox is partly or totally covered
by insulation. With a “single phase + neutral” or a “two
phase” system, the cable will start from and end at one
point. With a “three phase” system three cables should
be laid out over the pipe and at the end be connected
in star into a termination box.
When preparing the cable for application to the surface 10.
to be heated, carefully unroll the coil. Do not pull into
a spiral. Layout the cable on the pipe. Mount this cable
by means of fixing tape (FT-1L/FT-1H) for TES and SS
tie wire for MI. Take care not to over flex the hot to cold
junction. This part of the cable can be supported by
simply re-tying the first loop containing the joint. Cover
TES cable with aluminum tape prescribed per design or
recommend by Thermon for an output > 10 W/m. For
MI, avoid repeated bending and straightening of cable.
Caution:
FT-1L for max. pipe temp. up to 85 ºC
FT-1H for max. pipe temp. up to 260 ºC
Table 7.1 application XP (Plus)
Application
Application
Brown/black (XP)
Grey (XP)
Max. pipe
temperature
Area
(Non-) Hazardous 200 o C
Non-Hazardous 120 o C
Black (Terminator) 232 o C (Non-) Hazardous