依客思全新打造防爆原理（中英文对照版）

乐清市依客思林芝经过几天的整理,新的防爆小常识终于出炉了,请大家好好浏览,有啥问题可以随时!,防止爆炸的产生必从三个必要条件来考虑，限制了其中的一个必要条件，就限制了爆炸的产生。在工业过程中，通常从下述三个方面着手对易燃易爆场合进行处理：（1） 预防或大限度地降低易燃物质泄漏的可能性；（2） 不用或尽量少用易产生电火花的电所元件；（3） 采取充氮气之类的方法维持惰性状态

一、危险场所区域划分

    危险场所区域的含义，是对该地区实际存在危险可能性的量度，由此规定其可适用的防爆型式。电工委员会/欧洲电工委员会划分的防爆区域为：
    0区：连续地存在危险性大于1000小时/每年的区域；
    1区：断续地存在危险性10~1000小时/每年的区域；
    2区：事故状态下存在的危险性0.1~10小时/每年的区域；
中划分的有效区域和以上相同。

二、防爆标志解析

  ①气体组别
典 型 的
危险性
气  体欧洲电工
标准化委员会
EN50014EC北  美
NEC500条款
CLASS1表气中 
GB-3836-1小点燃能量
（微  焦）
乙  炔ⅡCAⅡC20
氢  气ⅡCAⅡC20
乙  烯ⅡBCⅡB60
丙  烷ⅡADⅡA180
  注:中GB3836标准规定ⅡC小点燃能量为19微焦耳,ⅡA小点燃能量为200微焦
     耳。
    气体分组和点燃温度,在一定环境温度和压力下与可燃性气体和空气的混合浓度有关。

  ②温度组别（T组）
    这是与气体点燃温度有关的电气设备（假定环境温度为40℃时）的高表面温度，点燃能量与点燃温度无关。在标准BS5345*部分中列出了所有可燃性气体和其组别。
高表面温度（℃）温度组别
 IEC79-8GB3836-1
450℃T1T1
300℃T2T2
200℃T3T3
135℃T4T4
100℃T5T5
85℃T6T6

  ③防爆标志
    以下以CENELEC氢气防爆标志为例：E Ex ia ⅡC T4
E：按CENELEC标志认可Ex：防爆公用标志
ia：防爆型式（本质安全）Ⅱ：设备组别
C：气体组别 T4：温度组别

  ④名词解释

    隔爆型电气设备（d）：是指把能点燃爆炸性混合物的部件封闭在一个外壳内，该外壳能承受内部爆炸性混合物的爆炸压力并阻止和周围的爆炸性混合物传爆的电气设备。

    增安型电气设备（e）：正常运行条件下，不会产生点燃爆炸性混合物的火花或危险温度，并在结构上采取措施，提高其安全程度， 以避免在正常和规定过载条件下出现点燃现象的电气设备。

    本质安全型电气设备（i）：在正常运行或在标准试验条件下所产生的火花或热效应均不能点燃爆炸性混合物的电气设备。

    无火花型电气设备 （n）： 在正常运行条件下不产生电弧或火花，也不产生能够点燃周围爆炸性混合物的高温表面或灼热点，且一般不会发生有点燃作用的故障的电气设备。

    防爆特殊型（s）： 电气设备或部件采用GB3836-83未包括的防爆型式时，由主管部门制订暂行规定。送劳动人事部备案，并经的鉴定单位检验后，按特殊电气设备"s"型处置。

三、防爆标准及选型

  ①各种防爆型式的对应标准

防爆型式在英允许
使用的场所中标准
GB3836防爆型式
符  号IEC标准
79-CENELEC标准
EN50
增安型1或23e7019
本质安全型0，1或24ia或ib11020（设备）
隔爆型d2d1018
特殊型s无s无无

  ②气体爆炸危险场所用电气设备防爆类型选型表

爆炸危险区域适用的防护型式
电气设备类型符  号
0区1、本质安全型（ia）ia
 2、其他特别为0区设计的电气设备（特殊型）s
 1、适用于0区的防护类型 
 2、隔爆型d
 3、增安型e
1区4、本质安全型ib
 5、充油型o
 6、正压型p
 7、充砂型q
2区1、适用于0区或1区的防护类型 
 2、无火花型n

四、外壳防护等（IP）代码
    （BS EN60529；1992）

  *位特征数字防止固定导体异物进入
0无防护
1固定异物直径大于50mm
2固定异物直径大于12mm
3固定异物直径大于2.5mm
4固定异物直径大于1.0mm
5防尘
6尘密

  第二位特征数字防止进水造成有害影响
0无防护
1垂直滴水
2倾角75-90°滴水
3淋水
4溅水
5喷水
6猛烈喷水
7短时间侵水
8连续侵水

举例：IP 65即要求具有尘密及对外壳喷水有防护功能

A zoning, dangerous places

Dangerous locations of meaning, a measure of the likelihood is a real danger to the region, the provisions of the applicable explosion-proof type. International electrotechnical commission/European electrotechnical commission of explosion-proof area as follows:

0 area: continuously hazardous region of greater than 1000 hours/year;

1 area: there is risk in an intermittent 10 ~ 1000 hours/year area;

2 area: the risk of accident situation is 0.1 ~ 10 hours/year area;

Dividing the effective area of China is the same as the above.

Second, explosion-proof marks parsing

（1） gas group

Canon model

The risk

Gas electrician in Europe

Committee for standardization

EN50014EC North America

NEC500 terms

CLASS1 table in China

GB - 3836-1 minimum ignition energy

（micro）

B acetylene Ⅱ CA Ⅱ C20

Hydrogen gas Ⅱ CA Ⅱ C20

B ene Ⅱ BC Ⅱ B60

Propyl silane Ⅱ AD Ⅱ A180

Note: China GB3836 standard Ⅱ c-class 19 micro joule, minimum ignition energy Ⅱ class A minimum ignition energy of 200 micro focus

Ear.

Gas group and light temperature, in a certain environment temperature and pressure is associated with the mixed concentration of combustible gas and air.

（2） temperature group （T group）

This is related to gas ignited temperature electrical equipment （assuming the environment temperature of 40 ℃） of the surface of the highest temperature, the light energy has nothing to do with the set temperature. In the first part of the standard BS5345 lists all combustible gas and its category.

Temperature of the maximum surface temperature （℃） group

IEC79-8 gb3836-1

450 ℃ T1T1

300 ℃ T2T2

200 ℃ T3T3

135 ℃ T4T4

100 ℃ T5T5

85 ℃ T6T6

（3） explosion-proof marks

The following sign CENELEC hydrogen explosion, for example: E Ex ia Ⅱ C T4

E: approved by CENELEC logo Ex: explosion-proof public signs

Ia: explosion-proof type （intrinsically safe） Ⅱ: equipment category

C: T4 gas group: temperature classes

（4） noun explanation

Flameproof electrical equipment （d） : refers to can ignite an explosive mixture of the components are enclosed in a shell, the shell can withstand the internal pressure and prevent explosion of explosive mixture and detonating an explosive mixture around electrical equipment.

Increased safety electrical equipment （e） : under the condition of normal operation, won't produce sparks ignite an explosive mixture or dangerous temperature, and measures in the structure, to improve the safety degree, so as to avoid overload conditions prescribed by the normal and phenomenon of lighting electric equipment.

Intrinsically safe electrical equipment: （I） in normal operation or under standard test conditions spark or heat effect generated by the mixture can ignite an explosive electric equipment.

No spark type electrical equipment （n） : under the condition of normal operation does not produce electric arc or spark, also does not produce around can ignite an explosive mixture of the surface of the high temperature or hot point, and generally do not have lighting effect of failure of electrical equipment.

Explosion-proof special type （s） : electrical equipment or components the GB3836-83 not including explosion-proof type, provisional rules drawn up by the competent departments. To send labor personnel department for the record, and after identification unit designated by the test, according to the special electrical equipment "s" type.

Three, explosion-proof standards and selection

（1） all kinds of explosion-proof types of corresponding standards

Explosion-proof type allowed in the UK

Place of use Chinese standard

GB3836 explosion-proof type

Operator, IEC standard

79 - CENELEC standards

EN50

Increased safety type 1 or 23 e7019

Intrinsically safe 0, 1 or 24 ia or ib11020 （equipment）

Flameproof d2d1018

S no s no special type

（2） gas explosion for the dangerous sites with explosion-proof electrical equipment type selection table

Suitable protective type explosion danger area

Electrical equipment type descriptor

Area 0 1, intrinsically safe （ia） ia

2, other electrical equipment specially designed for zero area （special） s

1, applies to the protection type in 0

2, flameproof d

3, increase safety type e

4, intrinsically safe ib 1 area

5, oil-filled type o

6, type positive pressure p

7, sand mold filling q

2 area 1, applies to 0 area or zone 1 protection type

2, no spark, n

Four, enclosure protection class （IP） code

（BS EN60529; 1992）

The first characteristic digital fixed conductor to prevent foreign matter into the

0 no protection

1 fixed foreign body diameter greater than 50 mm

2 fixed foreign material is greater than 12 mm in diameter

3 fixed foreign material is greater than 2.5 mm in diameter

4 fixed foreign material is greater than 1.0 mm in diameter

5 dust

6 dust tight

The second characteristic Numbers to prevent harmful impacts into water

0 no protection

1 vertical drop of water

2 inclination of 75-90 ° dripping water

3 water spray

4, splashed water

Five water spray

6 heavy water spray

Contamination of water 7 a short time

Eight consecutive inundation

Example: IP 65 requiring have dust and water protection function of enclosure

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