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For an AC MAINS SUPPLY not exceeding 300 V r.m.s. (420 V peak):: M+ D- _( E% h: P9 _: b5 a
a) if the PEAK WORKING VOLTAGE does not exceed the peak value of the AC MAINS SUPPLY
; f3 C% J* E: b* R+ Svoltage, minimum CLEARANCES are determined from Table 2K;
9 ]$ S: n! g9 X# Tb) if the PEAK WORKING VOLTAGE exceeds the peak value of the AC MAINS SUPPLY voltage,
" `4 l0 S- M# |# Tthe minimum CLEARANCE is the sum of the following two values:9 i( t" {$ ]; e
• the minimum CLEARANCE from Table 2K; and
$ H* Y. r. u3 `• the appropriate additional CLEARANCE from Table 2L.
9 E: g# o: E4 [2 N+ Y; R
* Z; ?# m$ {& G' y6 U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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