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|  DSH 4239 @" H& A2 M7 ]# X* \
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| Use of a PTC as a protective device& S8 p, x2 e2 a% A z3 e/ \
| 57.9 b)
6 P& x$ m* @3 O2 | | 60601-1(ed.2);am1;am22 \) M7 q' T% w5 b0 X6 G- K
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G0 I) v& d6 m1 T9 O" u" @Standard(s)- (year and edition):4 P. j }- W' \' D
IEC 60601-1:1988 Ed.2 Am1+Am2' K1 F) q* H; X7 s1 I8 \
Sub clause(s): 57.9 b)
* x% R) y( P- r. `* {: HSheet n°: DSH-4237 i7 l6 p, ~) k6 ^$ F& K; X' [
Subject: Use of a PTC as a protective device
2 J1 b. i( o: r3 \ P1 C5 ~0 L4 V+ hKey words: PTC, protective device, Mains supply transformers, overload4 W( K' _- e/ ]' O& l6 n& s
Confirmed by CTL at its 39th meeting, in Cologne2 O, m, v9 \6 N4 G% d
Question:
* b2 E( P# L+ XIs it permitted to use a PTC as protective device and what should be the overload test?
6 s0 a2 c0 M2 Y* f1 G6 @' rDecision:$ ^; h# s+ c8 k6 q: Q; Z; h
Where a PTC is used as a protective device for a mains supply transformer, the requirements for
/ p/ k! m; n# n1 M2 K4 [/ jTHERMAL CUT-OUTS as required by sub-clause 57.9 shall be applied.
2 y. x5 A; X: O8 U' H5 Z1 cThey shall be in accordance with International or National standards which address the reliability
* k" ?6 ]6 C) Hof these components, e.g. as specified in IEC 60950 Amendment 4 clause 2.11 (Ed. 2).# i7 B3 l; ?: I- ~: z9 s
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发表于 2012-11-5 10:57
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