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.
问题：
依据IEC 60664-1:2007第6.2条款测量PCB样品左右方块间爬电距离（见图）时，当d＜X同时D≥X，且左右方块之间的路径被导电浮动部件C分隔，该如何测量？
目前有两种观点：
1、按IEC 60664-1:2007示例11所示，爬电距离为d+D
2、因为d＜X可以被视为0，爬电距离为D
请问，哪种观点是正确的？
决定：
观点1正确，爬电距离为d+D
决议提示：
TC109支持观点1，并在下一版IEC 60664-1中会新修订一条规则：
如果槽宽度小于X，则爬电距离直接跨过槽测量，且不考虑槽的轮廓
现行版本（IEC 60664-1:2007）的规则是：所考虑的路线包括宽度小于Xmm而深度为任意的平行边或收敛形边的槽，则直接跨过槽测量（虚线为电气间隙路径，实线为爬电距离路径，见下图）
大侠提示：
PDSH2160号决议是今年新提出的暂行决议，等大会表决通过后才正式批准。本决议主要内容是爬电距离被导电浮动导体分隔，分隔段若有d＜X也不将d视为0
朋友们要注意本决议与IEC 62368-1有冲突（见下图）
IEC 62368-1针对相同案例的决定是d视为0
