Static Earthing | Clamps, Cables & Connectors for Hazardous Area Zone 1 & Zone 2 (ATEX Certified)
Earthing Clamps, Cables & Connectors For Hazardous Areas
Earthing & Bonding in Hazardous Area Locations & Explosive Atmospheres
Thorne & Derrick together with Newson Gale supply static earthing and bonding solutions to the hazardous area EX industries with over 35 years experience – we can specify and supply performance requirements of earthing and bonding to ensure that the potential for gas ignition, from low voltage electrical sources and equipment, is reduced.
Newson Gale offer a range of static earthing and bonding clamps with ATEX certification for use in Zone 1/21 (Gas) & Zone 2/22 (Dust) hazardous areas to reduce the explosion risk posed by incendive sparking caused by static electricity.
Protecting workers and company assets from ignitions caused by static electricity requires correctly specified, certified and installed earthing and grounding products – in facilities where flammable and combustible products are processed, there’s a very high probability that static electricity is generated by the movement of gases, liquids and solids. The risks of a fire or explosion caused by a discharge of static electricity in an EX/HAZLOC area are just too significant to ignore. To emphasise its significance static electricity is identified in North American and European legislation as a potential source of ignition in potentially flammable and combustible atmospheres.
What is Static Electricity?
Static electricity is the retained charge on a conductor. All the energy stored on the conductor can be released in one arc or ‘spark’ to catastrophic effect. To retain charge on a conductor, it has to be insulated from other conductors and insulated from earth by means of a non-conductor. Sparking, due to static electricity, can be avoided by using recognised earthing and equipotential bonding techniques.
The level of static electricity determines what protection is required – products range from static earthing clamps, cables and connectors suitable for road tankers, vacuum trucks, tank cars, IBC’s (intermediate bulk containers), process plant and equipment.
Definitions | Static Earthing & Bonding
BS7671 Requirements for Electrical Installations, defines the terms as follows:
Earthing – ‘Connection of the exposed-conductive parts of an installation to the main earthing terminal of that installation.’
Bonding – the correct title is ‘Equipotential bonding’. ‘Electrical connection maintaining various exposedconductive-parts and extraneous-conductive-parts at substantially the same potential.’
Static electricity can be generated in several potentially explosive atmospheres including:
- the flow of liquids
- the mixing of powders
- the production of sprays
- the contact and separation of solids
Static electricity causes problems in many industries, such as chemical, pharmaceutical, powder coating, tank farms, paints and coatings and petroleum sectors.
Industry Dangers & Processes
The following are typical at risk locations:
a) mines susceptible to firedamp
b) the processing and manufacture of explosives
c) areas where a risk may arise due to the presence of ignitable gases, dusts or fibres
d) catastrophic failures which are beyond the concept of abnormality
e) rooms used for medical purposes
f) areas where the presence of flammable mist may give rise to an unpredictable risk and which require special consideration
NEWSON GALE STATIC EARTHING – HAZARDOUS AREAS
Electrical equipment, including static earthing systems and electrical apparatus, for use in hazardous locations must be correctly specified and suited for the flammable gas/dust group, the temperature classification and that particular explosion protection concept.
Contact Thorne & Derrick for expert and professional guidance on the selection of the most suitable static earthing products for your application from the Newson Gale range.
Pictured: The Newson Gale Cen-Stat range of Static Discharge Electricity Cable Reels with ATEX Certification. When flammable or combustible products are being handled and processed in hazardous area zones it is essential to specify certified equipment that will protect personnel from sources of electrostatic ignition.
Pictured: The Newson Gale Earth-Rite PLUS is a static earthing interlock system for railcars, skids and IBC (loading/unloading) operations at risk of igniting combustible gases and vapors – ideal solution for grounding and bonding a broad range of equipment at risk of igniting combustible gases and vapours
Newson Gale static earthing clamps with ATEX certification provide hazardous area location static bonding controlling the risk of explosion caused by discharge of static sparks.
Hazardous Areas Defined & Classified According to ATEX Directive
A “hazardous area” is defined as an area in which the atmosphere contains, or may contain in sufficient quantities, flammable or explosive gases, dusts or vapours. In such an atmosphere a fire or explosion is possible when three basic conditions are met – this is often referred to as the “hazardous area” or “combustion” triangle.
Locations where flammable gases are, or may be, present, are defined by a Zonal concept and classified according to the ATEX Directive.
|Zone 0||A place in which an explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapour or mist, is present continuously or for long periods frequently||Typically, the space above the liquid in a storage vessel.|
|Zone 1||A place in which an explosive atmosphere consisting of a mixture with air or flammable substances in the form of gas, vapour or mist, is likely to occur in normal operation occasionally||The space immediately around a storage vessel’s vent pipe openings which vent during filling|
|Zone 2||A place in which an explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapour or mist is NOT likely to occur in normal operation but if it does occur, will persist for a short period only||Around Zone 1, it is usual to consider the surrounding space to be Zone 2|
Anti-Static Earth Clamps for IBCs
T&D offer anti-static earth clamps for IBCs helping to ensure that the IBC has a low resistance static earth connection.
Anti-static earth clamps for IBCs are designed to make positive low resistance electrical contact with the IBC.
The IBC earth clamps must have a conductive connection to a dedicated static earthing point. IBC users need to specify whether the earth clamps are to be used in a hazardous area. ATEX anti-static earth clamps for IBCs are not made from materials that could act as mechanical sources of sparking.