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7 n8 v0 f: @. u DSH 297
5 B0 M( `9 i. j1 A/ k2 S+ T4 W: ` | Measuring Circuit Terminals (Amd 2)
- Z+ I" w: Z" t, X% H* G | 5.1.5
; J* O0 o. `9 e1 m | 61010-1(ed.1);am1;am2
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Standard:* ]5 Z" u( U& _2 h; u
IEC 61010-1:1990
. L7 v3 M4 p. m/ V' K& T- @7 E% E+A1:1992+A2:1995
% b7 {5 h3 p! _- QSub clause:3 R8 {* ^# J/ I- }6 u) T
5.1.5
( n, g; d2 H4 v! j7 nSheet n. 297, p) m: P# q( A% g4 H+ N6 M. _* \& J
Page 1(1)3 [9 E* l, s% }) z3 o. \, N
Subject:
* v# _3 V E3 c. N$ I* S, n! z3 NMeasuring Circuit Terminals
. B: ~" U; t5 A) i6 @' u4 C(Amd. 2)# C4 A/ ~8 `+ v! C" l
Key words:3 D) ~: Y0 ~& S5 d, y" r* @6 W; |. P
Terminals5 L9 J6 X. u7 j
Marking
. h, H8 l5 y9 ` aDecision taken by
7 ^/ W; r( T! f+ X( E2 s9 iETF3 and confirmed; ]1 [7 M. ?5 |5 T6 e
by CTL at its 38th
- K6 d; C2 v, G0 {9 k# smeeting, in Toronto8 b# o( g" a3 Q/ Y
Question:
( Z6 `) p/ t) m" z: Y) Z6 F5 s4 Q/ EIs it acceptable for a measuring equipment to have its sensing terminals marked:* R7 D" e) |, c/ I" J) z. V6 G4 T, d9 o
“CAT II (600V)4 Q+ t+ ?& ^% @1 \5 f
CAT III (300V)”4 w3 d' N* g/ P6 _1 D. ]2 ?
Decision:
, `3 s; q/ k H: I; Q5 OMarking with both categories with the relevant voltages as shown is acceptable.% c# j! i) x1 s$ U# a% F
Explanation:$ q" o. r& @! l' F* V4 O
The standard allows operation under different categories provided the isolation is suitable for
M6 h( K6 S# B0 G9 L5 u9 S8 {the voltages concerned. In this case, it is possible to mark both categories since the
' A; E2 l% V9 y# f# irequirements for Cat II at 600V are the same as those for Cat III at 300V.
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