Optical Radiation Hazard
Optical Radiation : Ignition Risk & protection in Hazardous Areas The industrial use of equipment, utilizing OPTICAL RADIATION , is increasing day-by-day. The most common use is in the fields of … Continue reading
Ex Terminology
Ex Terminology Class ( locations) Creepage & Clearance Equipment Protection Level EPL Explosion Explosive Atmosphere Explosive Gas Atmosphere Explosive Dust Atmosphere Explosive Limits (upper & Lower Explosive) Flammable Substance Flash point … Continue reading
Minimum Ignition Current (Ratio)
Minimum Ignition Current ratio The minimum current required from an inductive spark discharge to ignite the MOST EASILY IGNITABLE MIXTURE of a GAS, MIST or DUST in air …..relative to … Continue reading
Glance: Ex Art
Ex Art (The, almost, hidden side of Hazardous Area protection) More …at Ex-Art
Ex Components
What is an Ex Component ? Definition : An Ex component is a part of electrical equipment or a module , marked with the symbol U, which is not intended … Continue reading
ATEX , IECEx & NEC
A personal view about Hazardous Area Codes Making , Specification , Testing & Certifying process The DIRECTIVE 94/9/EC has been replaced by a new DIRECTIVE 2014/34/EU. The old directive was … Continue reading
Selection of Electrical Equipment
Selection of Electrical Equipment for Hazardous Area Outline of procedure , in following simplified form , for selection of electrical equipment for installation in hazardous Area. The procedure is being presented … Continue reading
Equipment Protection Level
Equipment Protection Level (EPL) Its a Concept. This is a part of risk assessment method It has been introduced to enable an alternate approach to current methods of selecting Ex … Continue reading
Ex & Degrees of Protection (IP) According to IEC 60529
Ex & degrees of Protection (IP) according to IEC 60529 in comparison to NEMA Enclosure-Types. A system for classifying the degrees of protection provided by the enclosures of Electrical Equipment … Continue reading
Condensation of Water & Breather Gland
Condensation is a natural process by which the physical state of the matter is changed from GASEOUS STATE into LIQUID STATE. This process is opposite to that of VAPORIZATION. In this … Continue reading
Maximum Experimental Safe Gap
Maximum Experimental Safe Gap (MESG) Definition: (Ref: IEC 60079-1 ) Maximum Experimental Safe Gap (for an explosive mixture ) of a joint 25mm in width which prevents any transmission of … Continue reading
DUST Groups
Electrical Equipment for Group III (DUST) Electrical Equipment for use in explosive Atmospheres are divided according to the following types of explosive atmospheres (To facilitate the procedure of selection … Continue reading
[Associated Apparatus]
[Associated Apparatus] Power Reduction philosophy for Intrinsically Safe devices operating in Explosive Atmosphere References IEC 60079-Part 0: Equipment – General requirements IEC 60079-25: Explosive atmospheres – Part 25: Intrinsically safe … Continue reading
Documentation & Certifications
IEC 60079-14 gives us an over-view of the necessity & importance of the process of documentations for Hazardous Area Installations. By documentation we mean the material in Printed or … Continue reading
EXPLOSIONPROOF or FLAMEPROOF
A haunting question. Is it a dilemma or a complete solution ….does it require the NEC-IEC vision… Let us see… We will use the following picture as a symbolic representation … Continue reading
IEC Time Line
The time-line of Hazardous Area Protection Domain Safety Lamp by Sir Humphrey Davey, coal mines and the time-line of Hazardous Area Protection Techniques Coal is a source of energy. The … Continue reading
Ex (As per ATEX Directives)
Ex (As per ATEX Directives) This Hexagon Logo with “Ex” marked inside is as per specification of ATEX ( ATmosphères EXplosives ) . This mark along with the EC mark, … Continue reading
Zone II
Reference Documents: 60079-15 (Equipment protection by type of protection ‘n’) SCOPE: IEC 60079-15 is applicable to: Non-sparking electrical equipment Equipment having parts or circuits producing arcs or sparks Equipment … Continue reading
The Fire Triangle & The Dust Explosion Pentagon , The Fire Diamond
The “Fire Triangle” is a graphic representation of a concept, used to list the following prerequisites of an explosion:- FUEL (Flammable Material in form of GAS or Vapors ) Oxygen from the air … Continue reading
The Safety Lamp
THE BEACON OF SAFETY A short trip down the History Lane . Safety lamp for coal mines is a special lamp that provides illumination, using a small … Continue reading
To use..or NOT to use ..Conduit-Hub or Cable-Gland
NEC Art Gallery CONDUIT HUBS Conduit Hubs are used to terminate the conduits into an enclosure . Hub is installed, through a drilled hole into the certified enclosure and fastened … Continue reading
To Use… or NOT to use.. Conduits or Cables
Conduit or Cable for Ex d or Ex de Enclosures The term ‘Conduits’ refer to the use of Ex-certified metallic pipes to house the insulated electrical wires for transfer of electrical … Continue reading
Ex-pert Electrical Technologies 