Thermon MIQ Mineral Insulated Heating Cable v.2 - Manual (Page 4)

MIQ TM Mineral Insulated Heating Cable
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 ship-
ment.
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. Use of
a 1000 Vdc megohmmeter is recommended. After the ap-
plication of thermal insulation the measured value should
not be less than 5 megohms.
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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 grounded in
accordance with applicable codes.
8. Minimum installation temperature is -76°F (-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 1/2" (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 straight-
ening at same location.
16. Do not bend cable less than 6" (15 cm) away from hot to
cold joint, splice, or end termination.
17. Minimum spacing between cable is 1" (25 mm) when
installing multiple passes or loops.
18. The metal covering shall not be used as the bonding- to-
ground means. Alternate means of protection shall be
provided per applicable codes. The metal covering on this
set and metal structures or materials used for the support
of this set shall be grounded.
19. Provisions must be made to protect MIQ cable from weld-
ing slag, grinders, etc.
20. Keep lids on all power and splice junction boxes. Plug any
unused entries.
21. Refer to Thermon Form TMP0006 for information on
electrical safety precautions for electrical heat tracing.
22. 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.
23. Any excess heating cable must be distributed evenly along
pipe and equipment.
24. Junction boxes must be configured 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.