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20.1.3 PRINTED BOARDS8 O+ q1 \* z4 U- }! e& R
Base material of PRINTED BOARDS, on which the AVAILABLE POWER at a connection exceeds
+ Q$ I+ P; N# ^* n, F: Q15 W operating at a voltage exceeding 50 V up to and including 400 V (peak) a.c. or d.c. under5 o9 T, l& ]. [
normal operating conditions, shall be of flammability category V-1 or better according to7 X" k* z% w$ H2 s+ T
IEC 60695-11-10, unless the PRINTED BOARDS are protected by an enclosure meeting the
* a& a- l0 z% fflammability category V-0 according to IEC 60695-11-10, or be made of metal, having openings
0 n0 a: Z1 k- K( wonly for connecting wires which fill the openings completely.& m( E2 e' P0 z" s& `
Base material of PRINTED BOARDS, on which the AVAILABLE POWER at a connection exceeds 15 W
2 u- p$ J( i) O4 P% v; e Poperating at a voltage exceeding 400 V (peak) a.c. or d.c. under normal operating conditions, and2 _% s& n: V7 E2 G5 E R
base material of PRINTED BOARDS supporting spark gaps which provide protection against
1 [8 i" }- S% K$ Iovervoltages, shall be of flammability category V-0 according to IEC 60695-11-10, unless the# K4 R$ B6 S: R7 i- P* z: T$ C
PRINTED BOARDS are contained in a metal enclosure, having openings only for connecting wires
+ @9 ~+ T5 x, G0 k, M, E: x9 q! wwhich fill the openings completely.
[! J$ i1 \- Q6 lCompliance is checked for the smallest thickness of PRINTED BOARD used, in accordance with
+ Y# g, U) w; V2 l- V$ J3 M' }( }+ ceither:: {8 ?* F6 O( Y% Z) g0 Q; V
a) IEC 60695-11-10; or1 ?! R/ Z, E( I* [# _
b) with Clause G.1 on specimens of boards as used in the apparatus, but without components.9 x- w4 C" a7 [0 K
The tests under b) are performed after a preconditioning of 24 h at a temperature of
A/ u# @+ s0 W(125 ± 2) oC in an air-circulating oven and a subsequent cooling period of 4 h at room. [* G, z) y# p8 N
temperature in a desiccator over anhydrous calcium chloride.6 O: u; Q/ Q+ L6 g1 E( p* Y- L, o
# H5 v. f7 `0 \- S0 K! PPCB 的要求 |
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