*TESH & MI
Installation Guidelines
SERIES
HEATING CABLES
*TESH are mentioned in these installation guidelines as TES.
Thermon Europe B.V.
Boezemweg 25
2641 KG Pijnacker
The Netherlands
Phone: +31-(0)15-36 15 370
Facsimile: +31-(0)15-36 15 379
www.thermon.com
Subject to change without prior notice
Verify for the latest revision: www.thermon.com
TEP0118U-1111
Table of Contents
Description
Introduction ................................................................................................................................................................................2
Upon receipt of Thermon heat tracing materials ........................................................................................................................3
Installation sequence of a heat tracing system .......................................................................................................................4/5
Typical heat tracing system switching in-line .............................................................................................................................6
Typical heat tracing system via interposing relay or contactors ..................................................................................................7
Typical heat tracing system using stabilized design ....................................................................................................................8
Installation of TES and MI cable ............................................................................................................................................9/10
Installation on pipe work ........................................................................................................................................................... 11
Installation on valves .................................................................................................................................................................12
Installation on pumps ...............................................................................................................................................................13
Installation on pipe supports, bends and flanges .....................................................................................................................14
Installation on spectacle blinds .................................................................................................................................................15
Installation on safety valves ......................................................................................................................................................16
Installation on manholes ........................................................................................................................................................... 17
Installation on pressure gauges ................................................................................................................................................18
Installation on level gauges .......................................................................................................................................................19
Installation on vessels or tanks .................................................................................................................................................20
Installation of cable protectors .................................................................................................................................................21
Inspection and testing of heating cable and documentation ....................................................................................................22
Thermon offices........................................................................................................................................................................22
Checklist ...................................................................................................................................................................................23
Page
TEP0118U-1111
THERMON...The Heat Tracing Specialists
INSTALLATION GUIDELINES SERIES HEATING CABLES
®
PAGE 1
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 2
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
Introduction
These installation instructions have been made in such a
way to comply with the regulations as per the norm
EN IEC 60079-14 for hazardous areas (where applicable).
Furthermore, any other applicable national and local codes
must be applied.
Note:
- In all cases heat tracing systems must be protected by
means of earth fault protection of 30 mA to (preferred)
300 mA.
- Materials with IND in the product reference are for use
in non-hazardous areas only.
- Materials with Ex in the product reference are for use in
hazardous as well as in non-hazardous areas.
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 3
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
Upon receipt of Thermon heat tracing materials
Check the supplied materials and quantities against the
packing list. In case of deviations please contact Thermon
within 3 working days.
A) Inspection of the series heating cable
1. Check the printing or label on the heating cable to
make sure that the correct type has been received (if
applicable).
2. Check the printing on the cold lead cable to make sure
that the cable with the correct conductor size has been
received (if applicable).
3. Inspect visually for any damage incurred during
shipment.
4. Store in a dry place.
5. Cables should be handled with care to avoid crushing,
twisting or kinking.
Caution:
Do not connect power to the heating cable while it is on the
reel or in the shipping carton.
B1) Inspection of accessories for heat tracing cable using
IND and EX expediter or wall mounted JB-K type.
Cable relevant accessories
Whenever cable entry, power termination or end
termination is involved, Thermon series cable accessories
are related to the cable dimensions.
M20-PT100/TES-Exe : Gland for TES cables.
M25-TES2-Exe : Gland for TES cables.
MI cold lead cable is supplied with brass M20 or M25
glands.
General accessories
- circuit switches
- thermostats (TED1-..., T1-/T2-..., TC1-...,TS-...)
- junction boxes (JB-K...)
- SS mounting bracket (XP-1...) for junction boxes/
thermostats
- fixing tape (FT-1L/FT-1H)
- aluminium tape (AL-20H/AL-30H)
- SS clamps (ABA-25/ABA-40)/ SS B-type banding (B-4/
B-10/B-21)
- SS punch strip
- SS banding + seals
- Tool type LN
- Caution Labels (CL-E-...)
- Insulation Entry Kit (IEK-TES)
- Power and End Termination Kits (PETK-5, -6 and -7)
- Connector set (CETI 1525, TESFIT and CKTES-1 and -2)
- Cable protectors
B2) Inspection of accessories for heat tracing cable using
expediter or wall mounted Terminator type.
Cable relevant accessories
Whenever cable entry, power termination or end
termination is involved, Thermon series cable accessories
are related to the cable dimensions.
M20-PT100/TES-Exe : Gland for TES cables.
M25-TES-Exe : Gland for TES cables.
Z . - R-XP/WP type: TES
Z . - MI-WP type: MI
MI cold lead cable is supplied with brass M20 or M25
glands.
General accessories
- circuit switches
- thermostats (ZT-...)
- junction boxes (ZP-...)
- SS mounting bracket (XP-1-....) for junction boxes/
thermostats
- fixing tape (FT-1L/FT-1H)
- aluminium tape (AL-20H/AL-30H)
- SS clamps (ABA-25/ABA-40)/ SS B-type banding (B-4/
B-10/B-21)
- SS punch strip
- SS banding + seals
- Tool type LN
- Caution Labels (CL-E-...)
- Insulation Entry Kit (IEK-TES)
- Power and End Termination Kits (PETK-5, -6 and -7)
- Connector set (CETI 1525, TESFIT and CKTES-1 and -2)
- Cable protectors
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 nonmetallic 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.
Application
Application
Black (Terminator) 232 oC
Brown/black (XP)
Grey (XP)
Table 7.1 application XP (Plus)
Max. pipe
temperature
200 oC
120 oC
Area
(Non-) Hazardous
(Non-) Hazardous
Non-Hazardous
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
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 5
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
Installation sequence of a heat tracing system
Note:
Stainless steel tie wire for MI cable to be supplied by
electrical contractor.
Ensure that the heating cable is mounted on the pipe
at the right location (see page 11). The heating cable
is to be fixed to the pipe every 300 mm by means of
fixing tape or SS tie wire. If plastic pipes are traced, the
heating cable must, after having been fixed to the pipe,
also be covered with aluminium tape. If the plastic pipes
have a low temperature resistance, the pipe must be
wrapped with aluminium foil before the heating cable is
mounted.
Note:
Do not overtighten the SS tie wires around the MI
heating cables. The SS tie wires should be tightened
in such way to permit hand movement of the cable
between tie wire and the pipe, but not to allow the cable
to move freely under its own weight. This is essential as
it permits for movements of the cable during its heating
cycle, when otherwise restricted movement can lead to
cable failure due to fatigue.
Ensure the correct amount of cable is allowed on 11.
locations where additional heat losses can be expected
(such as pipe supports, flanges, valves, instruments
etc., see page 12 and further). The heating cables may
never touch or cross one another.
Set the thermostat (if applicable) at the desired 17.
temperature and note down the setting in the checklist
(page 23). We recommend, in case a thermostat
controller/limiter is mounted to the pipe, to mark the
controller knob with C and the limiter knob with L, by
means of for example a permanent marker.
Make sure that all openings in the junction boxes and/18.
or thermostats are closed so that no moisture can
penetrate.
After the thermal insulation has been mounted, the 19.
heating cable must be inspected, meg gered and the
loop resistance must be measured again (page 22).
Note down the readings in the checklist (page 23).
Apply caution labels to insulation weather barrier at 3 20.
meter intervals.
In case the heating cable cannot be terminated at once, 12.
the heating cable's ends must be sealed off temporarily
with for example some RTV-2 silicon sealant.
If applicable, connect a cold lead cable to each end of 13.
the heating cable.
Protect the heating cable against damage at those 14.
locations where damage could typically occur (at
insulation end plates at valves, pumps etc, see page
21).
Inspect, megger and measure the loop resistance of 15.
the heating cable again before thermal insulation is
installed (page 22) and note down the readings in the
checklist (page 23).
Note down the actual installed length of heating cable in 16.
the checklist (page 23) and/or isometric.
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 6
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
Typical heat tracing system switching in-line
T
T
T
JB
single phase or two phase
1
3
3a
3b
4
5
Power cable
Circuit switch with indicating lamp (padlockable)
2
Thermostat (controller or limiter)
Thermostat controller
Thermostat Limiter
Junction box
Cold lead cables
In case heat dissipation of TES cable is lower than 16 W/m, the
heating cable may be connected directly into the junction box or
thermostat without a cold lead. MI cables always via cold lead cable.
6
Cold lead junction
(see point 5)
7
Note:
For using thermostat limiters, see page 22-documentation
Series heating cable
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 7
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
Typical heat tracing system switching via interposing relay
JB
T
T
JB
T
T
T
or contactors
to power
single phase or
1
Power cable
Circuit switch with indicating lamp (padlockable)
2
two phase
supply
panel
or
3-phase
to power
supply
panel
3
3a
3b
3c
4
5
6
Thermostat controller/limiter combination
Thermostat controller
Thermostat limiter
Thermostat limiter/limiter combination
Junction box
Cold lead cables
In case heat dissipation of TES cable is lower than 16
W/m, the heating cable may be connected directly into
the junction box or thermostat without a cold lead. MI
cables always via cold lead cable.
Cold lead junction
(see point 5)
7
8
Note:
For using thermostat limiters, see page 22-documentation
Series heating cable
Star connection box
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 8
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
Typical heat tracing system using stabilized design
JB
T
JB/T
Single phase
1
Power cable
Circuit switch with indicating lamp (padlockable)
2
4
3
5
Junction box (Eexe)
Thermostat controller
Cold lead cables
In case heat dissipation of TES cable is lower than 16
W/m, the heating cable may be connected directly into
the junction box or thermostat without a cold lead. MI
cables always via cold lead cable.
or two phase
3-phase
via interposing
relay or contactor
To power
supply
panel
Cold lead junction
6
(see point 5)
7
8
Note:
For using thermostat limiters, see page 22-documentation
Series heating cable
Star connectionbox
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 9
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
With a single or two phase system: unroll the
1
cable, loop it and lay it alongside the pipe
section, so that both passes can be installed
simultaneously.
Note:
First attach the cold lead connection to the pipe
before unrolling the heating cable.
2
With a 3-phase system: unroll the cable and lay
it alongside the pipe section. The cables can be
installed separately or simultaneously.
Installation of TES and MI cable
150
cold lead
connection
150
150 mm
SS tie wire /
FT fixing tape
150 mm
heating cable
heating cable (3x)
Note:
First attach the cold lead connection to the pipe
before unrolling the heating cable.
Temporarily secure the heating cable to the pipe at
3
approx. 3 m. interval, using SS tie wire / FT fixing
tape, starting with the cold lead section (power
end) and working towards the end of the pipe.
Loops of cable for the recommenend allowance
are to be left at each heat sink - valve, flange,
pump, pipe support etc.- until final fixing of the
cable. For installation on valve, pipe support etc.
see page 12 and further.
cold lead
connection
+/- 3 m
SS tie wire /
FT fixing tape
SS tie wire /
FT fixing tape
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 10
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
Installation of TES and MI cable
After possible re-adjustment, the cable can be
4
secured at 300 mm interval using SS tie wire/FT
fixing tape. The cable loops at heat sinks, valves,
pipe supports, etc. can be formed into position.
On small flanges and joints, where it is impractical
5
to bend the heating cable to achieve close contact
across the surface, the heating cable and flange
should be wrapped with aluminium foil.
300 mm
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 11
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
Installation on pipe work
In principle the heating cable is mounted parallel to
the pipe and fixed by means of FT fixing tape or SS tie
wire. Only if prescribed in the design, the cable must be
covered with aluminium tape.
Description:
FT-1L tape for max. 85 °C
FT-1H tape for max. 260 °C
Stainless steel tie wire to be supplied by electrical
contractor.
For multiple parallel passes refer to illustration alongside.
Temperature limiter sensor (if applicable)
heating cable
300 mm
FT fixing tape / SS tie wire
2 heating cables1 heating cable
temperature
control
sensor
Note:
For using thermostat limiters, see page 22-documentation.
3 heating cables
4 heating cables
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 12
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
Installation on valves
TYPICAL CABLE ALLOWANCES
PER VALVE *
(single pass) in mm
N
O
M
I
N
A
L
P
P
E
S
Z
E
S
I
DN
I
C
R
E
W
E
D
F
L
A
N
G
E
D
B
U
T
T
E
R
F
L
Y
NPS
½" 12 150 300 - ¾" 20 220 450 - 1" 25 300 600 300
1½" 40 450 600 450
2" 50 600 750 600
2½" 65 900 750
3" 80 1050 750
4" 100 1500 900
FT fixing tape /
SS tie wire
heating cable
6" 150 2400 1050
8" 200 3300 1200
10" 250 4200 1350
12" 300 5000 1500
14" 350 5900 1650
16" 400 6900 1800
18" 450 8100 1950
20" 500 9000 2100
Note:
- The heating cables should not touch or cross one
another.
- When prescribed in design apply aluminium tape over
the heating cable.
- Min. bending radius of the heating cable is 5-6 x cable
diameter.
- Apply additional SS tie wire/fixing tape in such a way
that heating cable makes close contact with the valve.
* Allowances for valves up to
600 Lbs and a single pass of
heating cable
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 13
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
TYPICAL CABLE ALLOWANCES
PER PUMP
(single pass) in mm
Installation on pumps
N
O
M
I
N
A
L
P
P
E
S
Z
E
I
P
DN
I
U
M
P
NPS
½" 12 600
¾" 20 900
1" 25 1200
1½ 40 1200
2" 50 1500
2½" 65 1800
3" 80 2100
4" 100 3000
6" 150 4800
8" 200 6600
10" 250 8400
12" 300 10000
14" 350 11800
16" 400 13800
18" 450 16200
20" 500 18000
Note:
- The heating cables should not touch or cross one
another.
- When prescribed in design apply aluminium tape over
the heating cable.
- Min. bending radius of the heating cable is 5-6 x cable
diameter.
- Apply additional SS tie wire/fixing tape in such a way
that heating cable makes close contact with the pump.
FT fixing tape /
SS tie wire
heating cable
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 14
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
Installation on pipe supports, bends and flanges
For lines of 2" and larger
Note:
Install the cables on the
outer side of the bend as
shown
FT fixing tape /
SS tie wire
heating cable
450 mm
FT fixing tape /
SS tie wire
FT fixing tape /
SS tie wire
heating cable
Note:
- The heating cables should not touch or cross one
another.
- When prescribed in design apply aluminium tape over
the heating cable.
- Min. bending radius of the heating cable is 5-6 x cable
diameter.
- In each heating cable a loop must be made on the flange
if the pipe diameter allows for this.
- It is preferred to isolate the pipe support from the pipes.
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 15
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
For uninsulated spectacle blinds for lines of 2" and larger
FT fixing tape /
SS tie wire
Installation on spectacle blinds
A
heating cable
300 mm
Note:
- The heating cables should not touch or cross one
another.
- When prescribed in design apply aluminium tape over
the heating cable.
- Min. bending radius of the heating cable is 5-6 x cable
diameter.
- In each heating cable a loop must be made on the flange
if the pipe diameter allows it. Also extra loops before and
after the flange must be made.
A
Section A-A
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 16
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
Installation on safety valves
For lines of 6" and larger
(for cable length see valve allowances on page 12)
exhaust
Note:
- The heating cables should not touch or cross one
another.
- When prescribed in design apply aluminium tape over
the heating cable.
- Min. bending radius of the heating cable is 5-6 x cable
diameter.
- In each heating cable a loop must be made on the flange
if the pipe diameter allows for this. In case of process
heating, the valve and the piping up to section A - A to
be traced as an individual circuit.
heating cable
A
pipe
A
FT fixing tape /
SS tie wire
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 17
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
Installation on manholes
heating cable
FT fixing tape /
SS tie wire
Note:
- The heating cables should not touch or cross one
another.
- When prescribed in design apply aluminium tape over
the heating cable.
- Min. bending radius of the heating cable is 5-6 x cable
diameter.
- First mount the loop in the heating cable by means of tie
wire/fixing tape as shown.
- No heating cable to be installed on the manhole cover.
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 18
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
Installation on pressure gauges
heating cable on
bourdon type meter
FT fixing tape /
SS tie wire
heating cable
Note:
- The heating cables should not touch or cross one
another.
- When prescribed in design apply aluminium tape over
the heating cable.
- Min. bending radius of the heating cable is 5-6 x cable
diameter.
- One heating cable is installed over the gauge, the other
heating cable(s) continue(s) straight on.
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 19
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
Installation on level gauges
Front
FT fixing tape /
SS tie wire
heating cable
Rear
Note:
- The heating cables should not touch or cross one
another.
- When prescribed in design apply aluminium tape over
the heating cable.
- Min. bending radius of the heating cable is 5-6 x cable
diameter.
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 20
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
Installation on vessels or tanks
1. Mount banding (not too tight) at the upper side of the
vessel or tank.
2. Push the required number of punch strips of sufficient
length between the banding and the tank vessel
wall. Hang up the punch strips to the banding. The
open side of the lips in the punch strips must point
downwards (see detail A). Space the punch strips
equally over the cir cumference of the vessel/tank
(max. spacing 750 mm).
3. Tighten the upper banding.
4. Bend the punch strips to the middle of the vessel/
tank bottom. Put a tie wire through the last slot of the
punch strips. Twist the ends of the tie wire until the
punch strips are tight against the wall and bottom (see
detail B).
5. First mount a banding at the lower side of the vessel/
tank and the other banding at a dis tance from each
other of max. 1000 mm.
max. 750 mm
see detail A
max.
1000 mm
see detail B
6. Bend the lips of the punch strips upwards where
heating cable will be installed.
7. Place the heating cable in the upwards bended lips
(the lips are a support only and should not be
tightened over the heating cable!).
8. Connect the heating/cold lead cables into the power
supply box.
9. With a single phase + neutral or a two phase system,
the heating cable must be laid out along the vessel/
tank wall as a loop (so two heating cables parallel to
each other).
10. With a three phase system, the end of the three
cables must be connected to the end box, where a
star connection can be made.
11. Cover the heating cable over the total length with
aluminium tape.
Description:
SS punch strip
AL-20H aluminium tape
AL-30H aluminium tape
SS banding
SS banding seal
Stainless steel tie wire to be supplied
by electrical contractor
Detail A
SS banding
aluminium tape
heating cable
SS punch strip
Detail B (without heating cable)
SS tie wire
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 21
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
Installation of cable protectors
location of the cable crossing protector (see detail 1)
insulation cladding
Detail 1:
Detail 2:
Protector
Option a
or
Option b
cable protector
(see detail 2)
fixed with tape or
SS tie wire
location of the
insulation end plate
end plate
Option a:
Silicone protection sleeve
Type KS-2 (up to 250°C)
Note 1 and 2
Note 1: minimum required length 75mm
Note 2: minimum order length 1000mm
Option b:
SS protection plate
Type TEF
65 mm
cladding
insulation
4,5 mm
cable
27 mm
cable
7 mm
15 mm
14 mm
6 mm
19 mm
17 mm
Insulation Entry Kit
(IEK)
SS plate fixed with
screws on insulation
cladding
Type:
IEK-TES-1 for one cable type TES
IEK-TES-2 for two cables type TES
60 mm
60 mm
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 22
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
Inspection and testing of heating cable and documentation
Before thermal insulation is installed
Inspect the heating cable for possible damages along 1.
the length of the total circuit.
Megger the heating cable to ensure electrical resistance 2.
integrity. This will verify that the cable has not been
damaged during installation of the heat trace circuit.
The cable should be tested between heating cable
bus wires and the heating cable metallic braid 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.
Measure also the loop resistance. Note down the
readings in the check list (page 23).
Caution:
In case electronic thermostats are used in the
system, disconnect them before meggering the
heat tracing system.
After thermal insulation is installed
Megger the heating cable to ensure electrical resistance 1.
integrity. This will verify that the cable has not been
damaged during installation of thermal insulation of the
heat trace circuit. The cable should be tested between
heating cable bus wires and the heating cable metallic
braid 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. Measure also the loop resistance. Note down the
readings in the check list (page 23).
Caution:
In case electronic thermostats are used in the system,
disconnect them before meggering the heat tracing
system.
Documentation
1. Stabilized design can be used for series heating cables
to assign a lower T-class through the use of the Thermon
CompuTrace software or Thermon Engineering.
2. If stabilized design is used, the end user must record the
system parameters and the area T-class, and keep these
records for the time the heating cable is in operation.
3. If stabilized design is used, no temperature limiting device
has to be used.
4. In non-hazardous area's a limiter can be used when the
product is the limiting factor.
Caution:
A limiter must always be installed on the heating cable.
If applicable, inspect the heating cable at the entries in 2.
the insulation cladding and at insulation end covers.
INSTALLATION GUIDELINES SERIES HEATING CABLES
PAGE 23
THERMON...The Heat Tracing Specialists
®
TEP0118U-1111
CHECKLIST
for installation of series heating cables
General information
Thermon project no.
Unit
Customer ref. no.
Electrical contractor
Ref. no.
Inspector
System information
Line no.
Equipment no.
Circuit no.
Circuit switch no.
Thermostat no.
Junction box no.
Reel no. 1
Reel no. 2
Reel no. 3
Circuit length (in meters)
length 1 length 2 length 3
Check on electr. components
Date Initials
Circuit switch
Thermostat
Junction box
End termination
Thermostat settings
Control point
Limiter
Earth protection
Reading Initials
o
C
o
C
Date Initials
Braid connected to earth
Braid interconnected
Earthing of glands (metal)
Voltage check
Junction box
Reading Initials
V
General check Date Initials
Unused entries plugged off
All components closed
Insulation entries
Megger test*
before mounting of insulation
1 Phase or 2 Phase L - Earth
L1 - Earth
3 phase
L2 - Earth
L3 - Earth
Resistance test
before mounting of insulation
Lx-N /
1 Phase or 2 Phase
Lx-L
y
L1 - L
2
3 phase **
L2 - L
L1 - L
3
3
Remarks
Reading
M Ω
M Ω
M Ω
M Ω
Reading Date Initials
Date
Initials
Ω
Ω
Ω
Ω
Megger test*
after mounting of insulation
1 Phase or 2 Phase L - Earth
L1 - Earth
3 phase
L2 - Earth
L3 - Earth
Resistance test
after mounting of insulation
Lx-N /
1 Phase or 2 Phase
Lx-L
y
L1 - L
2
3 Phase **
L2 - L
L1 - L
3
3
Copies to:
Reading
Reading Date Initials
Date Initials
M Ω
M Ω
M Ω
M Ω
Ω
Ω
Ω
Ω
* Minimum 50 M Ω
* *
Reading = 2 x 1-phase resistance
Checklist sequence no.
European Headquarters
Boezemweg 25 P.O. Box 205
2640 AE Pijnacker The Netherlands
Tel.: +31(0)15-3615370
Thermon Corporate Headquarters
100 Thermon Dr. P.O. Box 609
San Marcos, TX 78667-0609 USA
For your local Thermon office visit us at
WWW.THERMON.COM
PAGE 24
THERMON...The Heat Tracing Specialists
INSTALLATION GUIDELINES SERIES HEATING CABLES
®
TEP0118U-1111
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