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Trace Heating Fixings and Junction Boxes

We provide a complete range of accessories for the heating element systems. The installation of the heater cables requires junction box, adhesive tape, connection kits, heat tracing warning labels and fitting accessories. These accessories are essentials to be sure that the heating system will work in optimum conditions and comply with standard requirement.

 

 

 

Junction Boxes

 

The heating cable can be connected to a junction box for various reasons;

•        For the connection of power to energise the circuit.

•        For splitting the cable, for example at tee-points or to allow cables to be split at pipe spools

•        At the remote end of the cable to allow maintenance testing.

To prevent water ingress into a junction box, the correct glands specified by the manufacturer must be used. These are normally included with the termination kits above.

The boxes provide appropriate protection and certification if installed in Hazardous Areas.

Junction box lids should not be left open at any time. The metallic braid or sheath of the heat tracer must be bonded to the Earthing system to provide for an effective ground path.

 

Support Brackets

A complete range of Stainless Steel support bracket are available .

 

Fixing Tapes

To correctly ensure that the heating cable maintains intimate contact with the equipment it is meant to be protecting, there are various ways the cable should be secured.

Adhesive Tapes or Tie Wrap

This method is the simplest form of holding the cable to a pipe or piece of equipment. It uses either a simple, low temperature PVC adhesive tape, or a higher temperature fibre glass reinforced adhesive tape.

The tape should be wrapped around the pipe and cable at approximately 300mm spacing. 2 to 3 wraps of tape should be sufficient to make sure that the tape does not come loose during the constant heating and cooling of the pipe and cable.

The PVC tape is a lower temperature solution (max 90° C) and the glass-fibre tape can withstand higher temperatures (max 190°C).

Cable tie-wraps can also be used, although this does interfere slightly with the insulation layer above it as it interferes with the inner wall of the insulation, especially on smaller diameter pipes.

Adhesive Aluminium Tape

This can be used in place of the above two types of tape. It is placed straight over the top of the heater and the pipe and helps spread the heat out over the pipe/equipment.

It is also very useful when applying to the surface of pumps, vessels and tanks. In these instances a layer of tape is applied directly to the equipment where the heater cable will be installed then a second layer of aluminium tape will be applied over the heater to completely secure it in place.

Aluminium tape is a requirement on the installation of plastic, lined or sensitive products. This helps spread the heat and reduces the sheath temperature of the cable by increasing its surface area.

As a side effect of installing cable with aluminium tape is that the output of the cable is very slightly higher than expected. This is especially notable in very low ambient environments (e.g. Arctic type temperatures, etc.). Very low start temperatures (-30°C or less) should take this into account when sizing the distribution and protection equipment.

 

 

Heater Terminations

 

It is essential that all heat tracers are terminated correctly with approved components to manufacturer’s instructions. This ensures that both ends of the cable are completely protected from moisture ingress and they are electrically insulated from any other metallic components.    

There are various different termination kits available throughout the various ranges of heating cables.

If the heating cable is to installed into a hazardous area, approved termination kits must be used to conform to the appropriate regulations.

 

We provide both cold terminations and heat shrink versions.

 

Caution Labels

These are to be applied to the outside of the insulation every 3m, on alternating sides of the pipe. This warns personnel that the pipe is carrying a potentially electrically energised cable.