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20.1.3 PRINTED BOARDS3 B' o) b- t+ F7 Q/ I. {
Base material of PRINTED BOARDS, on which the AVAILABLE POWER at a connection exceeds
$ Q. v1 e( P, a: T. A15 W operating at a voltage exceeding 50 V up to and including 400 V (peak) a.c. or d.c. under
2 W ]8 Y* A O6 b0 \. q( u7 _0 r- xnormal operating conditions, shall be of flammability category V-1 or better according to" x, ~0 H! n6 ]; a9 K/ M8 y) d
IEC 60695-11-10, unless the PRINTED BOARDS are protected by an enclosure meeting the! Z- u6 `( g7 S( S y) |4 e
flammability category V-0 according to IEC 60695-11-10, or be made of metal, having openings
6 e( M/ s+ s7 O7 i, ~$ R/ Nonly for connecting wires which fill the openings completely.5 M' S6 t/ ?; h9 G( m: ?
Base material of PRINTED BOARDS, on which the AVAILABLE POWER at a connection exceeds 15 W! Q2 o! p- `# r7 J# T4 ^, V
operating at a voltage exceeding 400 V (peak) a.c. or d.c. under normal operating conditions, and1 n! X) O! s9 t
base material of PRINTED BOARDS supporting spark gaps which provide protection against
& L$ G, X+ Q# j7 ?( d! Dovervoltages, shall be of flammability category V-0 according to IEC 60695-11-10, unless the
& \' S) f$ \- ~2 C; |& y" @' oPRINTED BOARDS are contained in a metal enclosure, having openings only for connecting wires
4 x: c- ~! h+ N* W: }& Mwhich fill the openings completely.
4 _1 i% m+ ?2 y0 J/ G: d0 I5 HCompliance is checked for the smallest thickness of PRINTED BOARD used, in accordance with* G% [& x; @- G; l* m; k
either:4 R. e1 k6 |: b
a) IEC 60695-11-10; or# W3 _1 c o; [& a+ B( \
b) with Clause G.1 on specimens of boards as used in the apparatus, but without components.
, l. r/ L* e6 N2 c4 {The tests under b) are performed after a preconditioning of 24 h at a temperature of6 Z: k7 X9 j9 Y/ {7 F Z: D2 ~
(125 ± 2) oC in an air-circulating oven and a subsequent cooling period of 4 h at room# F% Y1 U* q1 e' H0 J2 h$ K
temperature in a desiccator over anhydrous calcium chloride.+ ]7 \1 A9 s) t6 x. E2 J
* g9 N E. r6 s" i
PCB 的要求 |
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