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NEMA區(qū)域分級NEMA Area Classification

時間:2008/3/20閱讀:2394
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NEMA區(qū)域分級NEMA Area Classification

      
NEMA區(qū)域分級,適用于Z常用的閥門執(zhí)行機構(gòu)的電器外殼
NEMA Area Classifications for Electrical Enclosures most commonly
specified on Valve Actuator Requirements

  類型3S -- 防塵,防雨和防雹冰 -- 室外
  Type 3S—Dust-tight, RaintightSleet Ice Proof—Outdoor
  類型3S外殼適用于室外應(yīng)用,保護殼內(nèi)設(shè)備不受風(fēng)塵和水的侵蝕,并在外殼覆蓋外層冰或雹的情況下,殼內(nèi)設(shè)備仍然能夠運行。這些外殼并無法保護殼內(nèi)設(shè)備免受由于內(nèi)部結(jié)冰導(dǎo)致的故障。如果有這種要求,則應(yīng)該咨詢儀器制造商。
  Type 3S enclosures are intended for use outdoors to protect the enclosed equipment against windblown dustwaterto provide for its operation when the enclosure is covered by external ice or sleet. These enclosures do not protect the enclosed equipment against malfunction resulting from internal icing; where this is a requirement, the apparatus manufacturer should be consulted.

  類型4 -- 防水和防塵 -- 室內(nèi)
  Type 4—WatertightDust-Tight—Indoor

  類型4外殼適用于室內(nèi),用來保護殼內(nèi)設(shè)備不受噴灑水的侵蝕,滲水,水瀑或軟管道流出的水,以及嚴重的外部凝結(jié)水的頁面。
  Type 4 enclosures are intended for use indoors to protect the enclosed equipment against splashing water, seepage of water, falling or hose directed water,severe external condensation.

  類型6 -- 可浸入水中,防水,防塵和防雹冰,室內(nèi)和室外
  Type 6—Submersible, Watertight, Dust-TightSleet Ice Resistant IndoorOutdoor

  類型6外殼適用于偶爾會出現(xiàn)浸水情況的室內(nèi)和室外應(yīng)用。這種外殼應(yīng)該保護殼內(nèi)設(shè)備不受6英尺靜水壓持續(xù)30分鐘的侵蝕,不受灰塵、無腐蝕性液體的噴灑或外部凝結(jié),水瀑或軟管流出的水,棉花和滲水的侵蝕。
  Type 6 enclosures are intended for use indoorsout-doors where occasional submersion is encountered. They shall protect the enclosed equipment against a static head of water of six 6 feet for thirty 30 minutes, dust, splashing or external condensation of noncorrosive liquids, falling or hose directed water, lintseepage. They are not sleet ice proof.

  類型7,類別1,組A, B, C, 和D空氣開關(guān)設(shè)備 -- 室內(nèi)
  Type 7, Class 1, Groups A, B, C, & D Air-Break Equipment—Indoor

  類型7外殼適用于室內(nèi)應(yīng)用,在此環(huán)境和位置符合《美家電氣規(guī)程》中類別1,組A, B, C, 和D的定義。字母A, B, C, 或D表示在危險區(qū)域內(nèi)的氣體或蒸汽環(huán)境,作為后綴加以指明。正如《美家電氣規(guī)程》中的定義,“類型7"提供完整的NEMA標(biāo)志符號,分別符合類別1,組A, B, C, 或D。
  Type 7 enclosures are intended for use indoors in the atmosphereslocations defined as Class IGroups A, B, C,D in the National Electrical Code. The letters A, B, C, or D which indicate the gas or vapor atmospheres in the hazardous location appear as a suffix to the designation, “Type 7" to give the complete NEMA designationcorrespond to Class 1, Group A, B, C, or D, respectively, as defined in the National Electrical Code.

 

  類型9,類別11,組E, F, 和G空氣開關(guān)設(shè)備 -- 室內(nèi)
  Type 9, Class 11, Groups E, F, & G Air Break Equipment—Indoor

  類型9外殼適用于室內(nèi),其環(huán)境符合《美家電氣規(guī)程》中有關(guān)類別11,組E,F, 或G的定義。字母E, F, 或G表示在危險區(qū)域內(nèi)的灰塵環(huán)境,作為后綴加以標(biāo)明。正如《美家電氣規(guī)程》的定義,“類型9"提供了完整的NEMA標(biāo)志,分別符合類別11,組E, F, 或G。這些外殼防止有爆炸量的危險粉塵的進入。
  Type 9 enclosures are intended for use indoors in the atmospheres defined as Class 11Groups E, F, or G in the National Electrical Code. The letters E, F, or G which indicate the dust atmospheres in the hazardous location appear as a suffix to the designation “Type 9" to give the complete NEMA designationcorrespond to Class 11, Group E, F, or G, respectively, as defined in the National Electrical Code. These enclosures prevent the ingress of explosive amounts of hazardous dust.

  危險環(huán)境的摘要信息根據(jù)《美家電氣規(guī)程》和UL
  Summary of Hazardous Atmospheres Based on National Electrical CodeUL

  在NEMA類型7和9定義中以加以說明。組用字母標(biāo)明,標(biāo)記在類性和類別之后,表示危險區(qū)域內(nèi)的氣體或蒸汽環(huán)境。
  As explained in the definitions of the NEMA Types 79. The groups indicated by letters, which follow the type class, indicate the gas or vapor atmospheres within the hazardous locations.
  下列表格列出這些組包括的典型環(huán)境。
  The following chart is a listing which gives the typical atmospheres covered by these groups.
  您會注意到所列的環(huán)境在類別內(nèi)包括“子類別1或2"?!白宇悇e"清楚的表明所在區(qū)域是“通常是危險的"或是“異常時是危險的"。
  You will note that this list also includes a “Division 1 or 2" in addition to the class. The “Division" simply indicates if the area in question is considered “Normally Hazardous" or “Not Normally Hazardous."

  1. 子類別1區(qū)域,通常是危險的。
    A Division 1 area, is or might be hazardous under normal conditions.
  2. 子類別2區(qū)域,異常時是危險的。
    A Division 2 area, might become hazardous should an unusual condition arise.
 
類別
CLASS
子類別
DIVISION

GROUP
典型環(huán)境
TYPICAL ATMOSPHERES
I
氣體
蒸汽
I
Gases
Vapors
1
通常是
危險的
1
Normally
Hazardous
A
乙炔
Acetylene
B
氫;人造煤氣;和類似的氣體
Hydrogen; Manufactured Gas;Equivalent
C
乙烷基蒸汽;乙烯;環(huán)丙烷
Ethyl-Ether Vapors; Ethylene; Cyclopropane
D
汽油;乙烷;石腦油;汽油;
丁烷; 丙烷;乙醇酒;丙酮;
苯;漆用溶劑;天然氣
Gasoline; Hexane; Naphtha; Benzine;
Butane; Propane; Alcohol; Acetone
Benzol; Lacquer Solvents; Natural Gas
2
異常時是
危險的
2
Not Normally
Hazardous
A
與子類別1相同
Same as Division I
B
與子類別1相同
Same as Division I
C
如上所述
Shown Above
II
易燃
II
Combustible
1
通常是
危險的
1
Normally
Hazardous
E
金屬粉塵,包括鋁,鎂,及其商用合金,
以及其他有類似特性的金屬
Metal Dust, Including Aluminum,
Magnesium,their Commercial
Alloys,other Metals of Similarly
Characteristics.
F
碳黑,煤,焦炭粉
Carbon Black, Coal, Coke Dust.
G
面粉,淀粉,谷類,粉塵
Flour, Starch, Grain, Dusts,
2
異常時是
危險的
2
Not Normally
Hazardous
G
與子類別1相同
如上所述
Same as Division I
Shown Above

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