DSH 548 Application of IEC 60320-1 type appliance inlets

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DSH 548

Application of IEC 60320-1 type appliance inlets ) e8 c& @. Q  t: x( a# a4 n/ O

1.5.2, 4.5.1

60950(ed.3)

Standard(s):
IEC 60950:1999
, j1 A' N) A* d5 N; q/ fSub clause(s):
, a9 T  x( u& ^1.5.2, 4.5.1
Dec. NO.
DSH-548
Subject:
) N8 @0 Q( }  I3 M% zApplication of IEC 60320-1 type
. W9 [- j' ?' e% u7 a' Happliance inlets
Key words:
( [$ V4 u% F( \) S3 v0 D---
Decision taken at the 41st
3 o2 Q% X! I/ q% A2 |# [CTL meeting.
Question:
Background:
) t% U2 @4 C: x. a6 uAn 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,
the losses still result in high operating temperatures.
7 z8 v4 Z: l% \" s- {8 ]Problem:
: m* o) I" V. V3 k; x1 M6 X. g* LIEC 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
and 2.
, o% L8 f* A; E& X% X3 r) SThis 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)
. v8 l2 j4 y9 Y3 AOR
(b) the temperature limit of IEC 60320-1 (70 °C for the pins of the appliance inlet for cold
conditions)
' n- w! k$ |! C1 fshall be chosen for the assessment of the maximum temperature of the appliance inlet.
$ s6 B; }, n4 iA clarification for following would be helpful:
) ]. }, \8 q% M) L3 `(i) Is (only) the maximum temperature of the appliance inlet housing to be measured?
/ m, p' Z) x. T* `- s- Y- gOR
8 H! B3 Z# X" _; r8 |(ii) Is it necessary to measure besides the temperature of accessible surfaces as well
/ w4 r% C& b3 u! t! c9 Xthe maximum temperature of the pins of an appliance inlet (test location as required
according to IEC 60320-1)?
Decision:
For 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:
3 y* x" H- r9 Y3 a, o5 P• 70 °C maximum pin temperature for appliance inlet for cold conditions
9 E# t- C8 T' \8 U( O: {+ t• Test location: Base of the pin (part of the pin where it protrudes from the engagement face)
- S2 j! B( v$ cThe temperature rise shall be determined at the maximum room ambient temperature as declared by
# o( r0 M" @0 o" P/ ?the AC Adaptor's manufacturer.
2 w% a* x3 c2 Q$ Q2 w& r
, N& Y  _- C# D5 u
+ S$ ]1 S2 ], _: M

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