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个人理解是跟电荷的能量危险有关,比如60950-1 Clause 2.4有类似要求:
: H5 X0 U9 B* }1 mFor parts not exceeding 450 V peak or d.c., the circuit capacitance shall not exceed 0,1 μF.# M1 O$ d- p O0 n) K6 P
For parts whose voltage, U, exceeds 0,45 kV peak or d.c., but does not exceed 15 kV peak or
- A& ^! x. N5 S# Z5 Ud.c., the circuit capacitance shall not exceed 45/U nF, where U is expressed in kilovolts.
3 d8 M4 `# v X/ S4 \4 BNOTE 2 The limit of 45/U corresponds to an available stored charge of 45 μC.* r- P3 ~$ V, N. }" E m) p
For parts whose voltage, U, exceeds 15 kV peak or d.c., the circuit capacitance shall not
& N4 f7 _6 S& z% @: x) s& u7 zexceed 700/U2 nF, where U is expressed in kilovolts.9 X+ b7 K7 y! [ U0 I/ g0 ?1 {
NOTE 3 The limit of 700/U2 corresponds to an available energy of 350 mJ.7 O- l' Z* k) [$ X
$ s' B0 V/ l# }( v- A3 f+ `' d4 |5 k
60065 Clause 9.1.1有类似要求:
( ]( g, }: l) j/ n: xand moreover. `' h& k. j( v! {9 Y* S
c) the charge exceeds 45 μC for stored charges at voltages between 60 V d.c. and 15 kV d.c.,# Y* G: h6 R; M# D% J; v5 o
or
, |2 F9 R# B/ R3 Jd) the energy of discharge exceeds 350 mJ for stored charges at voltages exceeding 15 kV d.c. |
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