DSH 394A Touch current for equipment having multiple supplies supplying power

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DSH 394A

Touch current for equipment having multiple supplies supplying power simultaneously 7 Z/ p9 _5 f( I# o' _/ \

5.1.2, last paragraph / 5.1 6 y3 K/ E  X3 z7 q% h7 e

60950-1(ed.1) & 60950(ed.3) 1 j7 g! N; z* p0 |2 C8 m9 W) a! E

Standard(s):
" c8 z7 L8 N' v; y& u9 [3 bIEC 60950 (1999) 3rd Ed.
IEC 60950-1 (2001) 1st ed.
Sub clause(s):
& l6 A3 M6 w- v' a* W5.1.2, last paragraph
9 f, p7 d1 B8 t5.1
( e# f. w0 Z8 N- T$ N$ WSheet n°: 394A
Subject:
  m7 O6 ~  K5 H9 s, pTOUCH CURRENT for equipment
having multiple supplies supplying
! R5 q, b; g6 s$ `2 w6 e# ]; ~8 x- Hpower simultaneously
Key words:
- TOUCH CURRENT for equipment
+ T5 ]# x/ Y' @2 Z5 |% Q/ zwith multiple supplies
% R/ |9 A" B# kDecision taken at the 41st
" d, V: k) T& _+ MCTL meeting 2004. This
5 ?( u  U& e; m( p; w7 P/ xdecision replaces n. 394
taken at the 39th CTL
3 h% {1 I1 H3 m, v: C/ n3 q1 pmeeting 2002
8 C) }1 k. x- E. \2 o) y. Z3 YQuestion:
1. Should the TOUCH CURRENT be measured for each individual supply source to determine if the
" M9 e9 f5 A0 T3 G& zPROTECTIVE CONDUCTOR CURRENT exceeds 3.5 mA and if it does exceed, then require PERMANENT
or PLUGGABLE TYPE B connection to the supply and meet 5.1.7?
. R2 \. w8 C- M4 g2. Should the cumulative TOUCH CURRENT be measured to determine if the total TOUCH CURRENT
exceeds 3.5 mA? If the total TOUCH CURRENT does exceed 3.5 mA then require that AC MAINS
0 c. j  u6 W3 w1 MSUPPLY to be connected to separate AC MAINS SUPPLY circuits with at least one source having a
reliable connection to PROTECTIVE EARTH (e.g. be PLUGGABLE TYPE B or PERMANENTLY
# x* @  a0 ^1 f; W/ |$ z' jconnected EUT?
7 G# C5 p4 }# b$ o3 L0 DRationale:
0 ?7 K: H  {" q2 ~4 ^2 MPLUGGABLE EQUIPMENT TYPE A does not have a reliable connection to building PROTECTIVE EARTH. Therefore, if
+ ?5 F5 O3 ^3 `3 q: R! ythe TOUCH CURRENT measurement exceeds 3.5 mA, then that particular source needs to be PERMANENTLY
( ]2 Z' A" K3 h4 r: y& N9 o0 sconnected or have a PLUGGABLE TYPE B connection to PROTECTIVE EARTH. In older buildings, EARTH may
. d  ~/ @& C2 C+ |% l5 c" tnot be present on the PLUGGABLE TYPE A socket outlets on the wall. The multiple connection does not help, as all
2 _- h5 w. U* g+ hsuch socket outlets may not have EARTH connection. Therefore, if the individual or cumulative PROTECTIVE
7 E0 F4 c9 d+ O( TCONDUCTOR CURRENT exceeds 3.5 mA, then at least one of the sources needs to be PERMANENTLY connected or
0 m5 E- J2 v8 y8 L/ jhave a PLUGGABLE TYPE B connection to PROTECTIVE EARTH. If one of the sources is required to be
PERMANENTLY connected or have a PLUGGABLE TYPE B connection to PROTECTIVE EARTH in order to
" {. R2 N9 D& I# H. p4 ~2 ?- F; o8 wcomply with the TOUCH CURRENT requirements, the equipment shall be provided with both a marking on the equipment
. r1 M) m. a$ @" S$ iand a statement in the installation instructions, specifying that the USER is to disconnect all power sources connection
2 G7 G( ^6 W, j" p* {( Q5 kbefore disconnecting the PERMANENT connection or the PLUGGABLE TYPE B connection
Decision:
See copy of the CDV for IEC 60950-1 2nd edition on Page 2
1 Z: }! d# R' j1 h