Thermon MIQ Mineral Insulated Heating Cable v.1 - Manual (Page 3)

INSTALLATION PROCEDURES
Heating Cable Installation General Information
1. Identify the heating cable to ensure the proper type
and quantity have been received. Factory-fabricated
series circuits will have an imprinted I.D. tag with
pertinent data. Compare information on heating cable
with packing slip and purchase order to verify receipt of
correct shipment.
2. Visually inspect materials for damage incured during
shipment.
3. Store in clean dry place. MIQ cable set cold lead ends
must be kept dry before, during, and after installation.
4. Do not connect power to heating cable while in shipping
carton or before installed on pipe/vessel.
5. Test insulation resistance of heating cable set when
received, when installed with pipe uninsulated and after
thermal insulation has been installed. Using a 500 Vdc
megohmmeter, the minimum acceptable reading is 20
megohms between conductor and metallic sheath.
IEEE 515 and EN-IEC 60079-30 recommend use of
a 1000 Vdc megohmmeter. After the application of
thermal insulation, the measured value should not be
less than 5 megohms.
6. Heating cables shall not touch, cross over, or overlap
itself after installation.
7. Metal structures or material used for the support of or
on which cables are sets are installed, are to be bonded
to earth in accordance with applicable codes.
8. Minimum installation temperature is -60°C.
9. Do not alter heating cable set length.
10. Do not remove metal tags from heating cable set.
11. Thermostat or solid state temperature control device
must be used when the system T-rating relies on
controlled designs to limit sheath temperature.
12. Heating cable must not be embedded in the thermal
insulation.
13. Heating cable set shall be spaced at least 13 mm from
any combustible surface.
14. MIQ cable set cold lead ends must be kept dry before,
during and after installation.
15. Do not damage cable by repeatedly bending and
straightening at same location.
16. Do not bend cable less than 15 cm away from hot to
cold joint, splice, or end termination.
17. Minimum spacing between cable is 25 mm when
installing multiple passes or loops.
18. Refer to Thermon form TMP0066 for information on
electrical safety precautions for electrical heat tracing.
19. Provisions must be made to protect MIQ cable from
welding slag, grinders, etc.
20. Keep lids on all power and splice junction boxes. Plug
any unused entries.
21. At tee branch in a pipeline, particularly if the branch pipe
is smaller than the main pipe, double tracing the smaller
pipe with the main heating unit may cause unbalanced
pipe temperature. Use caution, check schedules to see if
permissible.
22. Any excess heating cable must be distributed evenly
along pipe and equipment.
23. Junction boxes must be confi gured to exclude moisture.
If applicable, all conduits feeding into the junction box
shall be provided with appropriately rated drains to
prevent moisture migration into the junction box.
Notes . . .
1. Refer to the heating cable product specifi cation sheets for temperature
ratings as limited by the manufacturer.
MIQ™ (refer to Form TEP0020U)
1725 II 2 G Ex d IIC T1 to T6, Ta=-60°C to +55°C, IP66 or
II 2 G Ex de IIC T1 to T6, Ta=-60°C to +55°C, IP66 or
II 2 D Ex tD A21 IP66 T450°C to T85°C, Ta=-60°C to +55°C
FMG 09.0006 Ex d (or de) IIC T1 to T6,
Ex tD A21 IP66 T450°C to T85°C
MI™ (refer to Form TEP0111U)
1725 II 2G Ex e IIC Gb ISSeP12ATEX004U
Types of Heating Cables 1 . . .
2