Customs Union Commission （EAC）
"SAFETY EQUIPMENT FOR USE IN HAZARDOUS ENVIRONMENTS"
TR TC 012/2011
Technical Regulations of the Customs Union "On the safety equipment for working in
hazardous environments" (hereinafter - the Technical Regulations) come into force on 15 February 2013
CLASSIFICATION figures determined intrinsically safe equipment
I. Classification of hazardous areas
1. Classification of hazardous areas is applied to the choice of equipment, according to its level of protection that ensures the safe operation of such equipment in the appropriate hazardous area.
2. Depending on the frequency and duration of the presence of explosive gas or dust environment explosive areas are classified into the following classes:
1) for explosive gas atmospheres - classes 0, 1 and 2, and
2) for explosive dust atmospheres - classes 20, 21 and 22.
II. Equipment classification groups
Depending on the application, the equipment is divided into the following groups:
1)Equipment Group I - equipment intended for use in underground mines and surface structures,dangerous by fire damp and (or)combustible dust. Depending on the design of the equipment I can have one of three levels of protection,
2)equipment group II - equipment intended for use in the field (other than mines and surface facilities), for hazardous explosive gas atmospheres. Depending on the construction equipment group II may be one of three levels of protection. Equipment group II can be divided into subgroups IIA, IIB,IIC, depending on the category of hazardous mixture for which it is intended;
3)Equipment Group III - equipment intended for use in the field (other than mines and surface facilities), dangerous for explosive dust atmospheres. Depending on the design can be one of three levels of protection. Equipment Group III can be divided into subgroups IIIA, IIIB, IIIC, depending on the characteristics of an explosive atmosphere, for which it is intended.
III. Equipment Classification by level of protection
1. Equipment, depending on the risk of becoming a source of ignition and the conditions of its use in explosive environments classified by levels of protection:
1) "special explosion-proof" ("very high"),
2) "Intrinsically Safe" ("high"),
3) "increased safety explosion" ("high").
2. The level of protection "special ex-proof" ("very high") apply to equipment which is intended to operate in accordance with the manufacturer's operating parameters, the required level of protection,even in the unlikely failure remains functioning in the presence of an explosive atmosphere, in which failure One remedy required level of protection is provided by a second independent means of protection or the appropriate level of protection is provided by two failures of protection, occurring independently of each other.
equipment this level of protection is intended for use in underground mines and surface structure in which the risk of the presence of mine gas and (or) combustible dust (equipment group I), or on objects and (or)areas (equipment group II and III), in which an explosive environment provided by a mixture with air of flammable substances in the form of gas, vapor, mist or dust, fibers, volatile substances present continuously for long periods or frequently.
3. The level of protection "Intrinsically Safe" ("high") applies to equipment designed for operating in accordance with the manufacturer's operating parameters and the required level of protection and performance in normal operation with one be likely damaged.
Equipment group I of the level of protection must be able to safely turn off when the regulated concentration methane in the environment.
equipment this level of protection is intended for use in underground mines and surface structure, in which there is a probability of the presence of firedamp and (or) of combustible dust (equipment group I), or on objects and (or) their areas (equipment group II and III), which probably an explosive atmosphere in the form of gas, vapor, mist, dust, fibers, or flying particles.
4. The level of protection "increased safety explosion" ("enhanced") applies to equipment designed to operate in accordance with the manufacturer's operating parameters and operate only in a specified manufacturer's normal operation.
Equipment group I of the level of protection that you can safely turn off when the regulated
concentrations of methane is in the environment.
Level of protection of the equipment intended for use in underground mines and surface
structures (Equipment group I) or at the facilities and (or) their areas (equipment group II and III), which, under normal operating conditions, the presence of methane and (or) of combustible dust or
explosive environment created by a mixture with air of flammable substances in the form of gas , steam, mist or dust, fibers, volatile matter, it is unlikely, but if there is an explosive atmosphere, it is only for a short period of time.
IV. Types of EPL
1. Depending on the envisaged special measures to prevent the ignition of an explosive
atmosphere surrounding equipment can have one type or combination of types of protection:
1) relating to electrical equipment designed for use in explosive gas atmospheres:
"D" - flameproof;
"e" - Increased protection;
"I" ("IA", "IB", "IC") - Intrinsically Safe (intrinsically safe);
"m" ("ma", "Mb", "MC") - encapsulation;
"NA" - non-sparking equipment;
"NC" - pin device in Flameproof or hermetically sealed unit, or non-incentive, or tight unit;
"nR" - shell with limited pass gas;
"nL" - equipment containing electrical circuits with reduced energy;
"nZ" - pressurized shell;
"o" - an oil immersion;
"P" ("px", "PY", "PZ") - filling or blowing pressurized shell;
"q" - powder filling;
"s" - a special type of protection;
2) relating to electrical equipment designed for use in explosive dust environments:
"T" ("ta", "tb", "tc") - protection of the shell;
"I" ("IA", "IB") - Intrinsically Safe (intrinsically safe);
"m" ("ma", "Mb "," mc ") - encapsulation;
"P" - filling or blowing pressurized shell;
"s" - a special type of protection,
3) in respect of non-electrical equipment intended for use in potentially explosive atmospheres:
"C" - constructional safety ;
"B" - control of ignition source;
"k" - protection of liquid immersion;
"D" - flameproof protection;
"Fr" - shell protection with a limited pass gas;
"P" - protection of high blood pressure,
4)other recognized forms of protection.
2. Types of protection equipment are determined by the specific measures contained in the equipment of different levels of protection to prevent ignition of the surrounding explosive atmosphere:
1) proof enclosure "d" - the type of protection equipment, with which it is often able to ignite an explosive gas atmosphere, are in shell to withstand the pressure of the explosion explosive mixture inside it and prevent the spread of the explosion in the surrounding explosive atmosphere,
2) protection of the shell "t" - the type of protection in which the equipment is protected hull that provides protection against dust, and the means to control the surface temperature,
3 ) increased protection type "e" - the type of protection, which uses additional measures against the possibility of exceeding the permissible temperature and sparking in normal or in this (emergency) mode;
4) Intrinsic (intrinsically safe) "i" - the type of protection, based on the restriction of electricity (power) in an electric discharge and temperature electrical components to below the level that causes inflammation of arcing or thermal effects,
5) encapsulation "m" - type of protection in which the parts of the equipment which can ignite an explosive atmosphere by sparking or heating enclosed in a compound to prevent the ignition of an explosive atmosphere in the operation or installation;
6) Type of protection "n" - the type of protection, in which there are additional security measures that exclude the ignition of surrounding explosive gas atmosphere in the normal and the specified (abnormal) operating conditions of electrical equipment;
7) Oil immersion "o" - the type of protection in which the equipment or parts are immersed in a protective liquid, cannot ignite an explosive gas atmosphere, which may be present above the liquid or outside the enclosure;
8) filling or purging shell pressurized "p" - the type of protection, away from the external
environment shell or premises by having them cover gas pressure greater than ambient pressure;
9) powder filling "q" - the type of protection in which the parts capable of igniting an explosive atmosphere are fixed in position and completely surrounded by filler, preventing inflammation Foreign surrounding explosive atmosphere;
10) special type of protection "s" - the type of protection, based on the measures of protection than protection measures provided subparagraphs 1 - 9 of this points, but considered sufficient to provide protection during the evaluation or testing;
11) structural safety "c" - the type of protection in which additional measures of protection, can not ignite the surrounding explosive atmosphere from hot surfaces, sparks and adiabatic compression generated by moving parts equipment,
12) controls the ignition source "b" - the type of protection, providing installation in non-electrical equipment device, which eliminates the formation of an ignition source and through which the internal built-in sensors monitor the parameters of components and trigger the automatic protective devices or alarms,
13)protection liquid immersion "k" - the type of protection in which potential ignition
sources are safe or separated from explosive atmospheres by full or partial Immersion in a protective liquid, when the dangerous surface permanently covered by a protective fluid such way that an explosive atmosphere that may be above the level of liquid or outside the enclosure of equipment could not be ignited,
14)protection shell with limited pass gas "fr" - the type of protection, in which the flow is limited by the shell surrounding explosive atmosphere in the shell to an acceptable low level, in which the concentration of an explosive atmosphere in the shell below lower flammability limits.
V. Classification of equipment for temperature classes
Depending on the maximum allowable surface temperature of the equipment group II is divided into the following temperature classes:
1) T1 - 450 degrees Celsius,
2) T2 - 300 degrees Celsius
3) T3 - 200 degrees Celsius
4) T4 - 135 degrees Celsius
5) T5 - 100 degrees Celsius
6) T6 - 85 degrees Celsius