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

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DSH 394A " s4 _1 e1 z! J8 y# F. W

Touch current for equipment having multiple supplies supplying power simultaneously

5.1.2, last paragraph / 5.1

60950-1(ed.1) & 60950(ed.3)

, \% X: @8 \8 \' z, dStandard(s):
. A* C3 Q$ e$ m/ m1 ?9 W  dIEC 60950 (1999) 3rd Ed.
IEC 60950-1 (2001) 1st ed.
8 x( H2 A$ w: E6 v2 M- gSub clause(s):
5.1.2, last paragraph
5 X$ g" s" U! D: W  X5.1
0 x" P- b( q. r+ iSheet n°: 394A
Subject:
6 X2 r0 R3 T! m$ X% ]" F5 ^8 }TOUCH CURRENT for equipment
having multiple supplies supplying
) n1 u3 u& B/ k& g; J7 Y7 Hpower simultaneously
Key words:
2 P8 d: q+ ]* F. G- TOUCH CURRENT for equipment
with multiple supplies
& q/ b4 x) o; C2 @- QDecision taken at the 41st
CTL meeting 2004. This
decision replaces n. 394
taken at the 39th CTL
meeting 2002
# M) c* I4 ~# m7 L( v$ n% l. VQuestion:
. Q' W9 B5 @, I1. Should the TOUCH CURRENT be measured for each individual supply source to determine if the
  D6 `. G7 m' J2 NPROTECTIVE CONDUCTOR CURRENT exceeds 3.5 mA and if it does exceed, then require PERMANENT
4 x8 Q4 d5 h" ior PLUGGABLE TYPE B connection to the supply and meet 5.1.7?
' H/ |! Z! G7 E, H2. Should the cumulative TOUCH CURRENT be measured to determine if the total TOUCH CURRENT
- T. F* L/ W1 g" ]! k& L$ Y- H- Zexceeds 3.5 mA? If the total TOUCH CURRENT does exceed 3.5 mA then require that AC MAINS
6 x, q1 K# ?0 I. d$ G, C8 {SUPPLY to be connected to separate AC MAINS SUPPLY circuits with at least one source having a
3 L/ \; c. |/ ?; {, G7 t+ treliable connection to PROTECTIVE EARTH (e.g. be PLUGGABLE TYPE B or PERMANENTLY
5 r6 L+ ?1 z' n+ F" g- m; `connected EUT?
- ]4 l  V! f8 i+ [+ R, ~' D% YRationale:
& Y! N; c' T( @4 n* CPLUGGABLE EQUIPMENT TYPE A does not have a reliable connection to building PROTECTIVE EARTH. Therefore, if
the TOUCH CURRENT measurement exceeds 3.5 mA, then that particular source needs to be PERMANENTLY
& L% `7 D) D4 Lconnected or have a PLUGGABLE TYPE B connection to PROTECTIVE EARTH. In older buildings, EARTH may
" k) z+ s' D0 N7 i; Xnot be present on the PLUGGABLE TYPE A socket outlets on the wall. The multiple connection does not help, as all
; m2 [- x  H  r9 y0 r. r7 esuch socket outlets may not have EARTH connection. Therefore, if the individual or cumulative PROTECTIVE
% A6 I# m1 e: w, V! b5 l( d, b& PCONDUCTOR CURRENT exceeds 3.5 mA, then at least one of the sources needs to be PERMANENTLY connected or
/ X! J( E3 ?* Z; [have a PLUGGABLE TYPE B connection to PROTECTIVE EARTH. If one of the sources is required to be
6 j( \4 A/ Y4 _- P' rPERMANENTLY connected or have a PLUGGABLE TYPE B connection to PROTECTIVE EARTH in order to
comply with the TOUCH CURRENT requirements, the equipment shall be provided with both a marking on the equipment
and a statement in the installation instructions, specifying that the USER is to disconnect all power sources connection
+ ~1 K( T# [0 j4 N: N& ]before disconnecting the PERMANENT connection or the PLUGGABLE TYPE B connection
Decision:
) f- S6 |/ n6 x1 @7 K/ z% USee copy of the CDV for IEC 60950-1 2nd edition on Page 2
9 Z" W) B/ ~% D* D" o

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