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| CAT III for mains circuits6 C6 ^( b$ u9 H A0 H1 U! n' E& x
| 6.7.22 J! O) R& ^" f2 C4 M0 N7 l
| 61010-1(ed.2) s; I9 @- L F# H
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Standard(s)- (year and edition):
- R7 y/ y' C! `) u' nIEC 61010-1:2002 Ed.2
6 |* N2 d, M$ w: Y8 m E" ]Sub clause(s):# t* x& q: i2 q! N
6.7.2( Y% F+ X) U i j
Sheet n°: 536
# i/ Z- T7 }4 Z+ \% F+ }Subject:( h9 X6 M7 \# T
CAT III for mains circuits1 T' z3 W$ N9 H4 i
Key words:
c1 ~& e% N& z2 G# xMains, CAT III
) w; R: H% s+ Z6 K/ h+ I& k0 MDecision taken at the 40th7 Z9 B8 C# o; P! f, S% A; I& _. [
meeting 2003
& Z( S3 N0 g0 H% F# ~Question:
* C- H3 X1 y; a8 _1 C U% OMeasuring equipment (not kWh-meter) that is permanently installed in the service equipment has a
4 {& t: M7 S. P; W% f7 N) |! a. Q4 dpower supply unit which is connected close to the incoming service and the kWh-meter. The device% Z( Q/ u* [$ \: T- U- ]' P+ r: P
sends information to the electrical company, utilizing the mains service and
' T; b$ z f8 m% Z4 G- }5 {connected close to it. This is to my knowledge a CAT III area.1 }6 b% N. w' L, d
Since CAT III has been withdrawn for mains circuits (6.7.2), the requirement for a 300 V mains would- O$ b( w' o0 K- w7 ?) i
be 3 mm air / 3-6 mm creepage / 2 224 Vrms Test voltage on the supply side, according to table 4 and 9.: c2 `, H" z0 \) z) }
Decision:1 E& G7 m5 |1 f- l0 M, `/ i
In this case you can apply CAT III for measuring circuits.
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