PDSH 2160（IEC 60664-1）爬電距離路徑被導(dǎo)電浮動部件分隔后怎么測量？

Standard: IEC 60664-1:2007

Subclause: 6.2

Subject: Creepage distance less than X

To be approved at 2020 CTL Plenary Meeting

Question:

A PCB sample is tested according to sub-clause 6.2 of IEC 60664-1:2007. How to measure creepage distances when the path is split by floating conductive parts when d < X and D ≥ X?

NOTE: d < X, D ≥ X, C is conductive floating part 

Figure test PCB sample

Different interpretations of total creepage distance are as follows:

Opinion 1: The creepage distance is measured as shown in IEC 60664-1:2007 example 11. Creepage distance is the distance = d + D.

Opinion 2: Since the d is less than X, the d is considered as zero.Creepage distance is the distance = D.

Which opinion is correct?

Decision:

Opinion 1 is correct. Creepage distance is the distance = d + D.

問題：

依據(jù)IEC 60664-1:2007第6.2條款測量PCB樣品左右方塊間爬電距離（見圖）時(shí)，當(dāng)d＜X同時(shí)D≥X，且左右方塊之間的路徑被導(dǎo)電浮動部件C分隔，該如何測量？

目前有兩種觀點(diǎn)：

1、按IEC 60664-1:2007示例11所示，爬電距離為d+D

2、因?yàn)閐＜X可以被視為0，爬電距離為D

請問，哪種觀點(diǎn)是正確的？

決定：

觀點(diǎn)1正確，爬電距離為d+D

決議提示：

TC109支持觀點(diǎn)1，并在下一版IEC 60664-1中會新修訂一條規(guī)則：

如果槽寬度小于X，則爬電距離直接跨過槽測量，且不考慮槽的輪廓

現(xiàn)行版本（IEC 60664-1:2007）的規(guī)則是：所考慮的路線包括寬度小于Xmm而深度為任意的平行邊或收斂形邊的槽，則直接跨過槽測量（虛線為電氣間隙路徑，實(shí)線為爬電距離路徑，見下圖）

大俠提示：

PDSH2160號決議是今年新提出的暫行決議，等大會表決通過后才正式批準(zhǔn)。本決議主要內(nèi)容是爬電距離被導(dǎo)電浮動導(dǎo)體分隔，分隔段若有d＜X也不將d視為0

朋友們要注意本決議與IEC 62368-1有沖突（見下圖）

IEC 62368-1針對相同案例的決定是d視為0