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Hazardous Area Trace Heating

ATEX Trace Heating


Q. What is an explosive atmosphere?


As an ATEX Certified Company, ESH Trace Heating Ltd hold approvals for the manufacture and installation of explosive atmosphere trace heating solutions.

An explosive atmosphere location is defined as a place where concentrations of flammable gases, vapors, or dusts occur. If there is enough of the substance, mixed with air, any source of ignition could cause an explosion.

Explosions could lead to loss of life and serious injuries as well as significant damage and expense. Preventing the concentrations of dangerous substances, which create an explosive atmosphere, and preventing the ignition source are the two most commonly used ways to reducing the risk.

All electrical equipment that must be installed in hazardous locations are specifically designed and tested to ensure it does not initiate an explosion, due to arcing contacts or high surface temperature of equipment.


Q. What is a stabilised design?


stabilised system is where the power loading of the trace heating tape is such that under conditions of no temperature control i.e. thermostat failure, the sheath temperature of the trace heating tape cannot exceed the 'T' classification.

Ideally all heat trace systems should be designed to be stabilised systems.

Where stabilised designs cannot be achieved it is necessary to employ an over-ride thermostat with lockout and alarm facility to prevent the 'T' classification being exceeded.

NOTE: Non-stabilised designs may lead to operational problems as the over-ride thermostat may prevent the electric trace heating system delivering the required heat output (kWhr) under low ambient temperature conditions. It is therefore essential that the thermal design characteristics of the system are carefully evaluated.


Hazardous areas

  • Zone 0 - An area or enclosed space within any flammable or explosive substance, whether as, vapour, or volatile liquid, is continuously present in concentrations within the lower and upper limit flammability.
  • Zone 1 - An area in which any flammable or explosive substance, whether gas, vapour or volatile liquid is processed, handled, or stored, and is likely to occur in sufficient quantities to produce a hazard.
  • Zone 2 - An area in which any flammable or explosive substance, whether gas, vapour or volatile liquid although processed or stored, is so well under conditions of control that the production or release of an explosive or ignitable concentrate in sufficient quantity to constitute a hazard is only likely under abnormal conditions.


˜ ESH Product Range ˜

 Type SCBX

(Constant Wattage)

  Type FBTX

(Self Regulating)


(Junction Boxes)

Type HZ


 RS SC  fbtboj web pic 2  JB HZ Moulded HZ1 Stat pic web

ATEX certified parallel circuit - constant wattage heating cable for use in hazardous areas.

♦ Suitable for internal & external freeze protection & temperature maintenance

♦ Available in various wattage loading & voltages

♦ Flexible

♦ Easy to install

♦ High temperature withstand +200°C

ATEX Approved commercial / industrial self regulating cable suitable for with Explosive Atmospheres.

♦ Suitable for internal & external freeze protection & low temperature maintenance

 Available in various wattage loadings @ 240V

 Robust design

 Withstand temperature 80°C (unenergised) 65°C (energised)

ATEX Approved hazardous area junction boxes suitable for the safe interconnection of trace heating cables.

♦ Explosion Proof Enclosures

 EEx(d) Protection Concept

 JBHZM made from fire retardant glass reinforced polyester. EEx(e) Protection Concept

 JBHZC made from hot dipped galvanised cast iron (EN1561). EEx(d) Protection Concept

Designed for the control of surface temperatures of trace heating pipes & vessels within a hazardous area.

♦ Temperature range between -5°C to +220°C

♦ Available for pipe sensing or air sensing

♦ Explosion Proof Enclosure, EEx(d) Protection Concept

♦ Galvanised hot dipped cast iron enclosure

♦ ATEX Approved for use in Explosive Atmospheres