Shenhai-iVakadinadina ni Kacabote
Vakamacalataka
Na rating ni veitaqomaki ni kacabote, kalasi ni katakata, mataqali veitaqomaki ni kacabote, kei na ivakatakilakila ni vanua e gadrevi era sa ka bibi ni kena dikevi na iyaya livaliva ni kacabote-ivakadinadina. Na itukutuku oqo e vakayagataki me vakamacalataki kina na ivakatagedegede ni veitaqomaki mai na kacabote, na ivakarau ni katakata me rawa ni cakacaka vinaka kina na iyaya, na mataqali veitaqomaki ni kacabote e vakarautaki, kei na veivanua digitaki e veiganiti kina na iyaya.
Tauri ni Ex demo IIC T6 GB me ivakaraitaki
LAKO YANI
Na ivakatakilakila oqo e vakaraitaka ni iyaya livaliva e sotava e dua se sivia na mataqali kacabote-ivakadinadina ena ivakatagedegede ni kacabote-ivakadinadina;
Me vaka na veika matailalai e vakamacalataki ena iTukutuku 29 ni GB3836.1-2010 ivakatagedegede, e gadrevi me baleta na iyaya livaliva ivakadinadina ni kacabote me vakadinadinataki “Lako Yani” vakatakilakilataki ena dua na itutu kilai levu ena yagona e tautuba. Me kena ikuri, the equipment’s nameplate must display the necessary explosion-proof marking along with the certification number that verifies its
compliance.
Demb
The displayed explosion protection type of the explosion-proof electrical equipment determines the specific kacabote hazard zone it is designed for.
Mataqali iVakadinadina ni Kacabote
| Mataqali ivakadinadina ni kacabote | Explosion proof type marking | Notes |
|---|---|---|
| Mataqali yameyame | d | |
| Mataqali tataqomaki vakalevu cake | e | |
| Pressurized | p | |
| Mataqali taqomaki vakai koya | ia | |
| Mataqali taqomaki vakai koya | ib | |
| Mataqali kabai ni waiwai | o | |
| Sand filling type | q | |
| Adhesive sealing type | m | |
| N-Type | n | The protection levels are classified as MA and MB. |
| SpeciaL type | s | The classification encompasses nA, nR, and n-concave types |
Me Kilai: The table exhibits the prevalent explosion protection types for electrical equipment, presenting a combination of various explosion protection methods to form hybrid explosion protection types.
Me kena ivakaraitaki, the designation “Ex demb” signifies a hybrid explosion protection type for the electrical equipment, vakacurumi yameyame ni yameyame, taqomaki vakalevu cake, kei na iwalewale ni kena vakamacalataki.
The classification of zones in areas prone to gas explosion hazards:
In areas where explosive gases and sega ni vakataotaki rawa vapors combine with air to form explosive gas mixtures, three zone classifications based on the level of danger are established:
iWasewase 0 (referred to as Zone 0): A location where explosive gas mixtures continuously, frequently, or persistently exist under normal circumstances.
iWasewase 1 (referred to as Zone 1): A location where explosive gas mixtures may occur under normal circumstances.
iWasewase 2 (referred to as Zone 2): A location where explosive gas mixtures are not expected to occur under normal circumstances, but may only appear briefly during abnormal occurrences.
Me Kilai: Normal circumstances refer to the regular startup, shutdown, cakacaka, and maintenance of equipment, while abnormal circumstances pertain to potential equipment malfunctions or
inadvertent actions.
The correlation between areas at risk of gas explosions and their corresponding explosion protection types.
| iLawalawa ni kasi | Na veivakatovolei levu duadua e qara na veitaqomaki MESG (mm) | iWiliwili lailai ni ignition ni MICR ena gauna oqo |
|---|---|---|
| IIA | MESG≥0.9 | MICR>0.8 |
| IIB | 0.9＞MESG＞0.5 | 0.8≥MICR≥0.45 |
| IIC | 0.5≥MESG | 0.45>MICR |
Me Kilai: Considering the specific circumstances in our country, the utilization of e-type (taqomaki vakalevu cake) electrical equipment is restricted to Zone 1, allowing for:
Wiring boxes and junction boxes that do not generate sparks, arcs, or hazardous temperatures during regular operation are classified as either d or m types for the body and e type for the wiring section.
Me kena ivakaraitaki, the explosion protection designation of the BPC8765 LED explosion-proof platform light is Ex demb IIC T6 GB. The light source compartment is flameproof (d), the driver circuit section is encapsulated (mb), and the wiring compartment features taqomaki vakalevu cake (e) for explosion-proof construction. As per the aforementioned specifications, this light can be used in Zone 1.
II
The equipment category of an explosion-proof electrical device determines its suitability for specific explosive gas environments.
Explosion-proof equipment is defined as electrical devices that, under specified conditions, do not ignite the surrounding explosive environment.
O koya gona, products labeled with the aforementioned explosion-proof designation (EX demb IIC) are exclusively suitable for all explosive gas environments, excluding coal mines and underground areas.
C
The gas group of an explosion-proof electrical device determines its compatibility with specific explosive gas mixtures.
Definition of Gas Group:
In all explosive gas environments, except for coal mines and underground areas (i.e., environments suitable for Class II electrical equipment), explosive gases are categorized into three groups, namely A, B, kei na C, based on the maximum experimental safety gap or minimum ignition current ratio of the gas mixtures. The gas grouping and ignition temperature are dependent on the concentration of kasi e dau vakacokotaki and air under specific environmental temperature and pressure conditions.
The relationship among explosive gas mixtures, gas groups, and the maximum experimental safety gaps or minimum ignition current ratios:
| iLawalawa ni kasi | Na veivakatovolei levu duadua e qara na veitaqomaki MESG (mm) | iWiliwili lailai ni ignition ni MICR ena gauna oqo |
|---|---|---|
| IIA | MESG≥0.9 | MICR>0.8 |
| IIB | 0.9＞MESG＞0.5 | 0.8≥MICR≥0.45 |
| IIC | 0.5≥MESG | 0.45>MICR |
Me Kilai: The left table reveals that smaller values of explosive gas safety gaps or minimum current ratios correspond to higher levels of risk associated with explosive gases. O koya gona, there is an increased demand for stricter gas grouping requirements in explosion-proof electrical devices.
Gas groups typically associated with common explosive gases/substances:
| iLawalawa ni kasi/ivakarau ni katakata | T1 | T2 | T3 | T4 | T5 | T6 |
|---|---|---|---|---|---|---|
| IIA | Formaldehyde, toluene, methyl ester, acetylene, propane, acetone, acrylic acid, benzene, styrene, kaboni monoxide, ethyl acetate, acetic acid, chlorobenzene, methyl acetate, chlorine | Methanol, etano, ethylbenzene, propanol, propylene, butanol, butyl acetate, Amyl acetate, cyclopentane | Pentane, idabedabe ni peni, hexane, etano, heptane, octane, cyclohexanol, turpentine, naphtha, petroleum (oka kina na benisini), waiwai ni waiwai, pentanol tetrachloride | Acetaldehyde, trimethylamine | Ethyl nitrite | |
| IIB | Propylene ester, dimethyl ether | Butadiene, epoxy propane, ethylene | Dimethyl ether, acrolein, hydrogen carbide | |||
| IIC | Hydrogen, kasi wai | Acetylene | Disulfide ni kaboni | Ethyl nitrate |
iVakaraitaki: In the case where the hazardous substances present in an explosive gas environment are hydrogen or acetylene, the gas group assigned to this environment is categorized as group C. O koya gona, the electrical equipment utilized within this setting should adhere to the gas group specifications of no less than IIC level.
In the case where the substance present in the explosive gas environment is formaldehyde, the gas group designated for this environment is classified as group A. O koya gona, the electrical equipment employed within this setting should adhere to the gas group specifications of at least IIA level. Ia, electrical equipment with gas group levels of IIB or IIC can also be used in this environment.
T6
Na ivakarau ni katakata group assigned to an explosion-proof electrical device determines the gas environment with which it is compatible in terms of ignition temperatures.
The temperature group is defined as follows:
Temperature limits, referred to as ignition temperatures, exist for explosive gas mixtures, defining the temperature at which they can be vakamai. O koya gona, specific requirements govern the surface temperature of electrical equipment used within these environments, necessitating that the maximum surface temperature of the equipment does not surpass the ignition temperature. Accordingly, electrical equipment is categorized into six groups, T1-T6, based on their respective highest surface temperature.
| Ignition temperature of combustible substances | The maximum surface temperature T of the equipment (°C) | iLawalawa ni katakata |
|---|---|---|
| t＞450 | 450 | T1 |
| 450≥t＞300 | 300 | T2 |
| 300≥t＞200 | 200 | T3 |
| 200≥t＞135 | 135 | T4 |
| 135≥t＞100 | 100 | T5 |
| 100≥t＞85 | 85 | T6 |
Based on the information provided in the left table, a clear relationship can be observed between the ignition temperature of combustible substances and the corresponding temperature group requirements for explosion-proof electrical devices. Vakabibi, as the ignition temperature decreases, the demands on the temperature group for the electrical devices increase.
The temperature classification correlates with the commonly encountered explosive gases/substances:
| iLawalawa ni kasi/ivakarau ni katakata | T1 | T2 | T3 | T4 | T5 | T6 |
|---|---|---|---|---|---|---|
| IIA | Formaldehyde, toluene, methyl ester, acetylene, propane, acetone, acrylic acid, benzene, styrene, kaboni monoxide, ethyl acetate, acetic acid, chlorobenzene, methyl acetate, chlorine | Methanol, etano, ethylbenzene, propanol, propylene, butanol, butyl acetate, Amyl acetate, cyclopentane | Pentane, idabedabe ni peni, hexane, etano, heptane, octane, cyclohexanol, turpentine, naphtha, petroleum (oka kina na benisini), waiwai ni waiwai, pentanol tetrachloride | Acetaldehyde, trimethylamine | Ethyl nitrite | |
| IIB | Propylene ester, dimethyl ether | Butadiene, epoxy propane, ethylene | Dimethyl ether, acrolein, hydrogen carbide | |||
| IIC | Hydrogen, kasi wai | Acetylene | Disulfide ni kaboni | Ethyl nitrate |
Me Kilai: The information provided in the above table is for reference purposes only. Please consult the detailed requirements outlined in GB3836 for accurate application.
iVakaraitaki: If carbon disulfide is the hazardous substance in the explosive gas environment, it corresponds to temperature group T5. O koya gona, the temperature group of electrical equipment used in this environment should be T5 or higher. E vaka tale ga kina, if formaldehyde is the hazardous substance in the explosive gas environment, it corresponds to temperature group T2. O koya gona, the temperature group of electrical equipment used in this environment should be T2 or higher. It is worth mentioning that electrical equipment with temperature groups of T3 or T4 can also be used in this environment.
GB
The equipment protection level signifies the level of protection for the explosion-proof electrical apparatus, denoting the safety rating of the equipment.
The definitions of equipment protection level for explosive gas environments are provided in section 3.18.3, 3.18.4, kei na 3.18.5 of GB3836.1-2010.
3.18.3
Ga Level EPL Ga
Equipment intended for explosive gas environments features a “cecere” ivakatagedegede ni veitaqomaki, ensuring it does not serve as an ignition source during regular operation, anticipated faults, or exceptional malfunctions.
3.18.4
Gb Level EPL Gb
The equipment intended for explosive gas environments features a “cecere” ivakatagedegede ni veitaqomaki, guaranteeing that it does not serve as an ignition source during regular operation or anticipated fault conditions.
3.18.5
Gc Level EPL Gc
The equipment intended for use in explosive gas environments exhibits a “raraba” level of protection and does not act as an ignition source during regular operation. Supplementary protective measures can also be implemented to ensure that it does not effectively ignite in situations where ignition sources are expected to occur frequently, such as in the case of lighting fixture malfunctions.