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For an AC MAINS SUPPLY not exceeding 300 V r.m.s. (420 V peak):' b: x1 d' j4 a" P, ~- m
a) if the PEAK WORKING VOLTAGE does not exceed the peak value of the AC MAINS SUPPLY& F0 W% [; j# ^8 Q. O3 B" M$ S
voltage, minimum CLEARANCES are determined from Table 2K;
/ w% m; V6 z. r+ I8 _/ Ab) if the PEAK WORKING VOLTAGE exceeds the peak value of the AC MAINS SUPPLY voltage,/ n( w$ a3 m& ^- y. n
the minimum CLEARANCE is the sum of the following two values:8 W# e! G: V9 [; A+ P
• the minimum CLEARANCE from Table 2K; and
' S% D z f; {6 C3 P! z" o9 v• the appropriate additional CLEARANCE from Table 2L.
1 S! ~$ N5 y3 x; P2 T/ n1 T) R* m$ b$ i0 ~
标准中的b)第一点中“the minimum CLEARANCE”是相对于什么的最小间隙呢?? |
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