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| CAT III for mains circuits0 C$ `! P( P1 B! a' [$ u3 p$ I# { E
| 6.7.24 }. O- I" ]8 X: d
| 61010-1(ed.2)
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Standard(s)- (year and edition):" q: ?: W) o0 @ j8 g+ Z' ^# k
IEC 61010-1:2002 Ed.2
o( K3 O8 a9 ASub clause(s):
7 m5 D! _0 ]7 A) ?6.7.2
2 W* R/ Z; O. A& t' t7 _Sheet n°: 536
0 T. J. g1 b ^5 i' j, xSubject:
/ }: _. |% ` \; w: O( e# iCAT III for mains circuits
# \2 E4 B/ f6 a0 ^3 R9 gKey words:
/ w W+ ?1 i1 B. yMains, CAT III
3 |* m5 `6 e. f- y KDecision taken at the 40th' Y3 ?& a' R0 E
meeting 2003* W, g2 }8 t* h
Question:
: @( l8 D4 }% G. g+ BMeasuring equipment (not kWh-meter) that is permanently installed in the service equipment has a
8 _( F5 e) I, n" L2 k: W& d! fpower supply unit which is connected close to the incoming service and the kWh-meter. The device
0 ?6 C4 y1 J- [5 c; s! zsends information to the electrical company, utilizing the mains service and9 S1 ^1 R7 r/ Y. l1 b
connected close to it. This is to my knowledge a CAT III area.7 {; }0 J& k9 s
Since CAT III has been withdrawn for mains circuits (6.7.2), the requirement for a 300 V mains would6 w+ U! H6 x6 N7 p* i
be 3 mm air / 3-6 mm creepage / 2 224 Vrms Test voltage on the supply side, according to table 4 and 9.
, w- ^ i! ?" L* z' @6 Z. u2 |2 O yDecision:. i& ?8 g- m3 K7 F" ]# F! f
In this case you can apply CAT III for measuring circuits.2 m# ?# v6 L9 \- e7 d
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