1771-dmc,1771-dmc
1771-dmc1771-dmc
應(yīng)用
顏色、圖形符號(hào)或字母數(shù)字符號(hào)應(yīng)標(biāo)注在相應(yīng)的線端或鄰近處。
當(dāng)采用兩種以上的識(shí)別方法,并可以能出現(xiàn)混淆時(shí),這兩種識(shí)別方法的相互關(guān)系必須在有關(guān)文件中說明。
系統(tǒng)通則
5.1 基本原則
5.1.1 字母數(shù)字系統(tǒng)由大寫正體拉丁字母和阿拉伯?dāng)?shù)字構(gòu)成。
5.1.2標(biāo)志直流元件的字母從字母表的前半部分即A至M中選用,標(biāo)志交流元件的字母從字母表的后半部分即N至Z中選用。
字母“I”和“O”不能使用,符號(hào)“+”和“-”可以使用。
5.1.3 當(dāng)不致產(chǎn)生混淆時(shí),允許省略第5.2條中規(guī)定的完整字母數(shù)字符號(hào)的某些部分。
5.2 標(biāo)記原則
端子標(biāo)記以下列原則為基礎(chǔ):
5.2.1 單個(gè)元件的兩個(gè)端子用連續(xù)的兩個(gè)數(shù)字來區(qū)別,奇數(shù)數(shù)字應(yīng)小于偶數(shù)數(shù)字,例如1和2。
5.2.2 單個(gè)元件的中間各端子用數(shù)字來區(qū)別,好用自然遞增數(shù)序的數(shù)字。例如:3,4,5等。中間各端子數(shù)字選用大于兩邊端子的數(shù)字,并應(yīng)從靠近較小數(shù)字的端子處開始標(biāo)志,例如一個(gè)兩邊端子為1和2的元件的中間各端子用3,4,5等數(shù)字標(biāo)志。
兩個(gè)兩邊端子和兩個(gè)中間端子
5.2.3 如果幾個(gè)相似的元件組合成一組,各個(gè)元件的端子可以接下列方法標(biāo)志:
a. 在5.2.1和5.2.2條中所規(guī)定的數(shù)字前冠以字母的方法來區(qū)分兩邊端子和中間各端子,例如:
用U、V、W標(biāo)志三相交流系統(tǒng)中設(shè)備的各相端子;
b. 不需要或不可能識(shí)別相位時(shí),在5.2.1和5.2.2條中所規(guī)定的數(shù)字前冠以數(shù)字的方法來區(qū)分兩邊端子和中間各端子。為避免混淆,在這些數(shù)字中間加入一個(gè)圓點(diǎn),例如:一個(gè)元件的端子用1.1和1.2標(biāo)志,另一個(gè)元件的端子用2.1和2.2標(biāo)志;
c.每一元件的兩端子以不同的連續(xù)數(shù)字來區(qū)別,該元件的奇數(shù)數(shù)字應(yīng)小于偶數(shù)數(shù)字。
5.4 特定導(dǎo)線線端的識(shí)別
特定導(dǎo)線線端字母數(shù)字的識(shí)別應(yīng)符合表1中的規(guī)定。
表1 設(shè)備特定接線端子的標(biāo)記和特定導(dǎo)線線端的識(shí)別
導(dǎo) 體 名 稱
字 母 數(shù) 字 符 號(hào)
設(shè)備端子標(biāo)記
導(dǎo)線線端的識(shí)別
交流系統(tǒng)電源導(dǎo)體
第1相
第2相
第3相
中性線
U
V
W
N
L1
L2
L3
N
直
流
系統(tǒng)電源導(dǎo)體
正 極
負(fù) 極
中間線
保護(hù)導(dǎo)體
不接地的保護(hù)導(dǎo)體
保護(hù)中性導(dǎo)體
接地導(dǎo)體
低噪聲接地導(dǎo)體
接機(jī)殼、接地架
等電位連接
C
D
M
PE
PU
—
E
TE
MM
CC
L+
L-
M
PE
PC
PEN
E
TE
MM
CC
注:1)只有當(dāng)這些接線端子或?qū)w的電位與保護(hù)導(dǎo)體或接地導(dǎo)體的電位不等時(shí),才采用這些識(shí)別標(biāo)記。接線端子做為連接器的一種,是電氣行業(yè)中的一個(gè)重要組件,起著不可替代、不可忽視的作用,因工程技術(shù)人員在檢修時(shí)首先也是從接口檢查,也就是端子入手,因此接線端子的設(shè)計(jì)尤為重要。
產(chǎn)品的設(shè)計(jì)是集于:產(chǎn)品標(biāo)準(zhǔn)、材料、結(jié)構(gòu)、電鍍、認(rèn)證、模具、及制造工藝的一種綜合性設(shè)計(jì),端子也不例外。
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