DSH 548 Application of IEC 60320-1 type appliance inlets

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DSH 548

Application of IEC 60320-1 type appliance inlets 9 j) h7 y# Q/ t; b& D0 w" Y

1.5.2, 4.5.1 / _' b% D7 d, J7 i; c3 q

60950(ed.3) $ `& O# D6 n4 L, y

9 z' O- ]* y8 L( v# CStandard(s):
IEC 60950:1999
( s3 [) X7 c* }$ [) GSub clause(s):
1.5.2, 4.5.1
. E7 c9 e; ^8 lDec. NO.
! w1 B& Y7 R  A  U- w$ G% VDSH-548
% u/ }) r& |0 n5 A# A; \: `Subject:
Application of IEC 60320-1 type
appliance inlets
( r* d, t4 `4 D0 P! WKey words:
---
& `5 _' D# P8 o5 c6 p& TDecision taken at the 41st
4 t) ?0 G4 {8 B) L- ACTL meeting.
9 w/ D6 b& F$ x- z! r& |6 JQuestion:
Background:
: ~% @& h6 c1 dAn increasing number of Notebook PCs require AC Adaptors to provide output power of up to 150 W
at an ambient of up to 40 °C (due Pentium-4 devices). Although designed with a very good efficiency,
" w& ?' R+ D) zthe losses still result in high operating temperatures.
Problem:
IEC 60950:99 refers in several subclauses and in Annex P to IEC 60320 series as relevant IEC
component standard for appliance inlets.
However, there aren't any specific temperature limits for appliance inlets specified in table 4A parts 1
+ J2 i4 r  {2 C$ J; R1 }+ q+ x' Pand 2.
This results in a non-uniform interpretation whether:
(a) the temperature limit of external surfaces of equipment which can be touched (95 °C
for the plastic housing of the appliance inlet)
& ~" ~( f1 a7 }: MOR
(b) the temperature limit of IEC 60320-1 (70 °C for the pins of the appliance inlet for cold
: {9 s6 P3 y/ ]; q9 b+ zconditions)
shall be chosen for the assessment of the maximum temperature of the appliance inlet.
, Y6 _* N; T6 d6 T" h/ B7 U! hA clarification for following would be helpful:
(i) Is (only) the maximum temperature of the appliance inlet housing to be measured?
# G/ p8 b* f# Y; N: ^$ X* UOR
(ii) Is it necessary to measure besides the temperature of accessible surfaces as well
) N5 ~) T# g1 E( H9 Sthe maximum temperature of the pins of an appliance inlet (test location as required
: f+ j# }- Z" H" Q0 D2 Baccording to IEC 60320-1)?
Decision:
% ]7 ]" V% {# c( BFor testing of a product incorporating IEC 60320-1 type appliance inlets, the temperature limits and
locations for temperature measurements as described in IEC 60320-1 shall apply:
* R. \% F- O  o: n  A4 ]• 70 °C maximum pin temperature for appliance inlet for cold conditions
• Test location: Base of the pin (part of the pin where it protrudes from the engagement face)
- V4 K) j  ?. }The temperature rise shall be determined at the maximum room ambient temperature as declared by
% [) a3 n: a* I$ qthe AC Adaptor's manufacturer.
4 w6 B9 f8 s( B: Q% P
# K4 W" v0 J6 S, V

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