UL 8750 spacings at field-wiring branch circuit supply terminas
如题,UL 8750 spacings at field-wiring branch circuit supply terminas,这里的“field-wiring branch circuit supply terminas”从字面理解指现场布线分支供电端子,但是具体哪些灯具有这样的端子,那么这里的距离适用哪些灯具?" spacings other than field-wiring branch circuit supply terminas"又适用于哪些灯具?很纠结。。。。 以下是我个人的理解,欢迎行家指正。field-wiring branch circuit supply terminas是指在连接到固定布线时需要现场安装连接的支路供电端子,other than field-wiring branch circuit supply terminas指的是内部连接端子,连接到固定布线时不再需要操作的。 本帖最后由 jsspace 于 2013-8-12 16:52 编辑tsunn 发表于 2013-8-11 16:00 http://bbs.angui.org/static/image/common/back.gif
以下是我个人的理解,欢迎行家指正。field-wiring branch circuit supply terminas是指在连接到固定布线时需 ...
兄弟,你的理解应该欠妥。
具体应该这样理解:field-wiring branch circuit supply termina 现场安装的端子,这个理解跟你的类似
other than field-wiring branch circuit supply terminas除了现场安装端子以为的其他情况,也就是说这个地方不一定指的是端子,比如带电部件到外壳的spacing的要求就是看这个条款。
所以综合以上的:
1)PCB上的spacing:参考表7.4
2)现场安装的端子的spacing: 参考表7.5
3)其他地方的spacing(如带电部件到外壳): 参考表7.6
jsspace 发表于 2013-8-12 16:37 static/image/common/back.gif
兄弟,你的理解应该欠妥。
具体应该这样理解:field-wiring branch circuit supply termina 现场安装的 ...
请教LN线焊接在PCB上 LN之间的距离看哪个表格?》 daocaoren 发表于 2013-8-12 22:06 static/image/common/back.gif
请教LN线焊接在PCB上 LN之间的距离看哪个表格?》
7.4........ jsspace 发表于 2013-8-12 22:24 static/image/common/back.gif
7.4........
PCB上LN之间是看7.4的哪一条呢
For Dry and Damp Locations: Live parts
reliably positioned AND insulator CTI <
600 (PLC = 3 or 4); examples: adjacent
foils on printed wiring board or lead wires
of a transistor or diode to its mountingd
还是
Field wiring terminals to each other and
fixed live or dead conductive parts daocaoren 发表于 2013-8-13 18:14 static/image/common/back.gif
PCB上LN之间是看7.4的哪一条呢
For Dry and Damp Locations: Live parts
For Dry and Damp Locations: Live parts) o1 U4 f$ U- a$ O安规网www.angui.org
reliably positioned AND insulator CTI <" I) }' g: J( e) M% D安规网www.angui.org
600 (PLC = 3 or 4); examples: adjacent7 \& \+ u' y* J* U8 @: O安规网www.angui.org
foils on printed wiring board or lead wires
" t& U& f4 N% X3 b- m. vof a transistor or diode to its mountingd
jsspace 发表于 2013-8-12 16:37 static/image/common/back.gif
兄弟,你的理解应该欠妥。
具体应该这样理解:field-wiring branch circuit supply termina 现场安装的 ...
但根据UL8750 7.8.3 Minimum spacings on printed wiring boards and for board mounted components, between
uninsulated live parts of opposite polarity, between an uninsulated live part and a grounded dead-metal
part, and between an uninsulated live part and an accessible dead-metal part shall be in accordance with
Table 7.4,对于PWB及板上安装的元器件的距离,带电部件到易接触的金属外壳之间,要符合表7.4.那么对于LED驱动,不在PWB板上 带电部件恐怕只有端子连接这类的了,而且这才算合理。如果按照7.6这个表,151-300V内,所有的带电部件到金属外壳的爬电距离需要9.5,不好达到要求。最近有个做UL的案子,灌胶的,277V输入,带电部件到接地端子的距离只有6.5mm,UL 那边都接受。 daocaoren 发表于 2013-8-13 18:14 static/image/common/back.gif
PCB上LN之间是看7.4的哪一条呢
For Dry and Damp Locations: Live parts
你最上面的一条,当然也要你实际的产品是否灌胶,怎样的工作环境 jsspace 发表于 2013-8-13 22:43 static/image/common/back.gif
For Dry and Damp Locations: Live parts) o1 U4 f$ U- a$ O安规网www.angui.org
reliably positioned A ...
为什么7.4会有这一条呢:Field wiring terminals to each other and
fixed live or dead conductive parts
Field wiring terminals 不是7.5的范围吗
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