What does it mean to add Gb after the explosion proof sign?

It means that the explosion protection level of the equipment is "GB".

According to the description of Article 29 of the national mandatory standard "GB ** Sexual Environment Part 1: General Requirements for Equipment", the equipment protection level GB belongs to:

**Equipment for gaseous atmospheres, with"High"is not a source of ignition under normal operation or expected failure conditions.

To prevent the occurrence of **, there must be three necessary conditions.

To consider, restricting one of the necessary conditions restricts the generation of **. Select the corresponding explosion-proof instrument and explosion-proof electrical equipment, and the standard structure is: flameproof type, increased safety type, positive pressure type, sand-filled type, intrinsically safe type and oil-filled type.

Device protection level"ga","gb","gc","ma"or"mb"

GB-class EPL GB :** gas environment equipment, with:"High"is not a source of ignition under normal operation or expected failure conditions.

GB, sarin (isopropyl meffluorophosphate), the code name for a type of nerve gas. I am targeting you based on the situation you have described!! Hope understandable.

GB is the device protection level, and there are two device protection levels, GA and GC. GA is the highest level of protection for the device, with a high level of protection.

According to the current national standard ** Sexual Environment Part 1: General Requirements for Equipment (hereinafter referred to as Section 29, Note 5:

Equipment protection level (EPL): The level of protection fixed for the equipment according to the possibility of the equipment becoming an ignition source and the different characteristics of the gas environment, the dust environment and the methane environment of the coal mine.

Class MA (EPL MA): Equipment installed in a methane** environment in a coal mine with a "very high" level of protection that is sufficiently safe that the equipment is unlikely to be a source of ignition in the event of normal operation, anticipated or rare failures, or even in the event of a sudden appearance of gases while the equipment is still live.

Mb Class (EPL MB): Equipment installed in a methane** environment in a coal mine with a "high" level of protection that is sufficiently safe that the equipment is unlikely to be a source of ignition during normal operation or under the expected failure conditions that occur in the time between the sudden appearance of the gas and the loss of power to the equipment.

Class GA (EPL GA) :** gaseous ambient equipment with a "very high" level of protection and is not a source of ignition during normal operation, anticipated failure, or rare failure.

Devices in the GB class (EPL GB) :** gaseous atmospheres with a "high" level of protection that are not ignition sources under normal operation or expected failure conditions.

Class GC (EPL GC) :** gaseous ambient equipment, with a "normal" level of protection, is not an ignition source during normal operation, and additional protection measures can be taken to ensure that effective ignition does not occur in the event that the ignition source is expected to occur frequently, such as luminaire failure.

Class DA (EPL DA) :** equipment for use in dusty environments with a "very high" level of protection that is not a source of ignition during normal operation, anticipated failures, or rare failures.

Class DB (EPL DB) equipment for use in :** dusty environments with a "high" level of protection that is not a source of ignition under normal operation or expected failure conditions.

Class DC (EPL DC) equipment for :** dusty environments, with a "normal" level of protection, is not an ignition source during normal operation, and additional protection measures can be taken to ensure that effective ignition does not occur in the event that the ignition source is expected to occur frequently (e.g., luminaire failure).

It should be more than just gigabytes, there should be numbers and things like that. If there is, it is the meaning of the national standard, and if there is not, it is not clear what it means.

The full letters of the explosion-proof mark are: ExdiambiibT4.

Among them: "EX" stands for explosion-proof, "D" stands for explosion-proof type, and "IA" stands for intrinsically safe.

Related equipment, "MB" means potting type, "IIB" means factory type of gas explosion-proof type with ethylene as gas represents gas, "T4" means that the maximum surface temperature of explosion-proof electrical does not exceed T4, that is, the surface temperature does not exceed 135°C.

The ignition temperature of the gas mixture is the temperature limit that can ignite the gas, and the stool is divided into T1 to T6 groups according to the maximum surface temperature of the electrical equipment, so the maximum surface temperature of the corresponding electrical equipment in the T1 to T6 group can not exceed the allowable value of the corresponding temperature group, the temperature group, the relationship between the surface temperature of the equipment and the ignition temperature of flammable gas or vapor.

The transmission capacity of the gas mixture indicates the hazard level. The greater the transmissibility of the sexual mixture, the greater its danger. The explosive transport capacity of the explosive mixture can be demonstrated by the maximum test safety distance.

Flammable and explosive gases, liquid vapors and mist are easy to ignite and also indicate the presence of ** danger, expressed by the minimum ignition current ratio. Class II explosion-proof electrical equipment or intrinsically safe electrical equipment is further divided into IIA, IIB and IIC according to the maximum test safety distance or minimum ignition current ratio applicable to ** gas mixtures.

The full letters of the explosion-proof mark are: ExdiambiibT4. Among them, "ex" means explosion-proof; "D" indicates explosion-proof type; "ia" stands for intrinsically safe.

related equipment; "MB" indicates potting type; "IIB" indicates the factory type of grinding stupidity, ethylene as the gas of the gas explosion-proof type represents the gas; "T4" means that the maximum surface temperature of explosion-proof electrical does not exceed T4, that is, the surface temperature does not exceed 135°C.

The full letter of the <> explosion-proof sign is "exdiambiibt4". Among them, "ex" stands for explosion-proof; "D" indicates explosion-proof type; "ia" denotes intrinsically safety-related equipment; "MB" indicates potting type; "IIB" means the factory type of gas mill with ethylene as gas, and the explosion-proof type represents the gas; "T4" means that the maximum surface temperature of explosion-proof electrical does not exceed T4, that is, the surface temperature does not exceed 135°C.

1.Marking of each flameproof type of explosion-proof electrical equipment.

Flameproof type "D".

Increased safety type "E".

Intrinsically safe type "i".

Positive pressure type "P".

Oil-filled type "O".

Sand filling mould "Q".

Non-sparking type "N".

Pouring type "M".

Airtight type "H".

Unique type "S".

Dust explosion-proof type "DIP".

2.Labelling Requirements.

In the conspicuous place of the explosion-proof electrical equipment casing, be sure to set a clear permanent embossed mark with the word "EX"; Small and medium-sized electrical equipment and instrumentation equipment can be selected with signs, or welded to the casing, or can be selected with concave signs.

In the conspicuous place of the electrical equipment casing, be sure to set the factory nameplate, and fix it firmly. The factory nameplate must contain the following specific contents:

In the upper right corner of the factory nameplate, there is a prominent mark "EX";

Explosion-proof mark, and marked with flameproof type, type, grade, temperature grade and other marks in turn;

Explosion-proof certificate identification code;

other special standards that must be indicated;

Additional indication of the relevant explosion-proof type-specific standard;

The item is on the factory date or product number.

3.Labeling is an example.

In order to better establish the expression of rock shop marking, the following examples are given:

If the electrical equipment is flameproof: it is marked as DI.

If the electrical equipment is flameproof, Class B T3 group: marked as D BT3.

If the electrical equipment is classified as Class IA T5 of the safety system type, it is marked as IA AT5.

If more than one hybrid type is used for electrical equipment, it is necessary to indicate the explosion-proof type of the actor first, and then the other explosion-proof type.

Example: Group T4 of a member with a positive pressure type for the main body of the actor to increase safety: EP T4.

For electrical equipment that is only allowed to be used in an environment of flammable gas or vapor, it may be indicated by the chemical formula or name of the vapor or vapor, and it is not necessary to indicate the grade and temperature class.

Example: Flameproof type for ammonia atmosphere: D (NH3) or D ammonia.

For the marking of electrical equipment, the temperature level can be marked, the maximum surface temperature, or both. For example, the maximum surface temperature is 125 for the processing plant to increase the safety type: C T4; c (125) or c t4 (125).

For hybrid electrical equipment, the corresponding explosion-proof mark must be marked on the casing of different explosion-proof types.

Class B of the safety system type is associated with the electrical equipment Class C T5 group: (IB), CT5.

Deficient pair class idiotype: s.

In addition to biogas, there are usually flameproof electrical equipment such as Class B T3 flammable gas in mines: D BT3.

In order to ensure safety, the explosion-proof electrical equipment to be used under the specified conditions is indicated.

The need for a wide variety of signage must be clear, visible, and enduring to last.

Factory nameplates and warning signs need to be made of brass, bronze or stainless steel, and their thickness should not be less than 1mm; However, the factory nameplate and warning plate of the instrument equipment and instrument panel are not less than thick.

"GB" refers to the protection level of explosion-proof electrical equipment, and "GB" level files such as explosion-proof electrical equipment can be used in Zone 1 and Zone 2, but cannot be used in Zone 0.

Come and prepare for stupid renting from the south imitation Zhaoyang Zhongtian.

EX - explosion-proof mark (China and the International Electrotechnical Commission explosion-proof mark) D - flameproof electrical equipment (refers to the electrical equipment that encloses the parts that can ignite the ** mixture in a shell, which can withstand the ** pressure of the internal ** mixture and prevent the explosion of the ** mixture around it).

Class II-II electrical equipment (used in other ** gas environments except coal mine gas gas) C-IIC environment representative gas is hydrogen (IIA-methane, IIB-ethylene) GB-** gas environment equipment, with a "high" protection level, not an ignition source under normal operation or expected failure conditions (there are three levels of GA, GB, GC).

GA:**Equipment for gaseous atmospheres with a "very high" level of protection that is not a source of ignition during normal operation, anticipated failures, or rare failures.

GB: ** equipment for gaseous atmospheres, with a "high" level of protection, is not an ignition source under normal operation or in the event of an expected failure.

GC: ** equipment for gas atmospheres, with a "general" level of protection, is not an ignition source in normal operation, and some additional protection measures can also be taken to ensure that no effective ignition is formed in the case of the expected frequent occurrence of the ignition source (e.g. the failure of the lamp).

DA: Equipment for use in dusty environments with a "very high" level of protection that is not a source of ignition during normal operation, in the event of an expected failure or in the event of a rare failure.

db: Equipment for use in dusty environments with a "high" level of protection that is not a source of ignition under normal operation or in anticipation of failure conditions.

DC: This explosive dust environment equipment, with a "general" level of protection, is not an ignition source in normal operation, and some additional protection measures can be taken to ensure that effective ignition is not formed in the case of the expected frequent occurrence of the ignition source (e.g., the failure of the luminaire).

The meaning of the explosion-proof mark EXDIIBT4GB is, EX means explosion-proof, D means that the explosion-proof form is flameproof type, the II table partner shows that it belongs to Class II anti-return explosion-proof electrical equipment, B represents IIB class gas, T4 means that the temperature group is T4, the maximum surface temperature of the equipment is less than 135, and GB represents the protection level of the equipment. What is the meaning of the explosion-proof mark EXDIIBT4GB, in addition to the D type, the explosion-proof form is unprecedented in the world, as well as IA, IB (intrinsically safe type), E (increased safety type), O (oil-filled type), Q (sand-filled type), M (pouring type) and composite type. Class II explosion-proof electrical equipment is suitable for the most advanced gas environment in Laling except for coal mines, and in addition, there is also Class III, which is suitable for the most advanced dust environment other than coal mines.

In addition to IIb gases, there are also IIC and IIC grades, of which IIC is the highest grade and can be applied to IIA and IIB, and IIB is the second grade and can be applied to IIA class.

According to the national standard for electrical explosion-proof, GB is the equipment protection level, which can be used in Zone 1 and Zone 2.

From Nanyang Zhongtian explosion-proof.