|
根据UL 60950 的说法如下:
8 N4 A* l E+ S7 ~8 q. t2 r1.2.8.12 TNV-1 CIRCUIT: TNV CIRCUIT
* F+ a9 I& Z" B5 D, m- m– whose normal operating voltages do not exceed the limits for an SELV CIRCUIT under8 Z4 b# j2 w+ X
normal operating conditions and
P9 ?9 f! K8 r- E9 m– on which overvoltages from TELECOMMUNICATION NETWORKS and CABLE DISTRIBUTION SYSTEMS
; v! v+ }9 R! z( J9 D2 Xare possible
+ }% L3 Z3 ~/ D; H1.2.8.13 TNV-2 CIRCUIT: TNV CIRCUIT
) Z3 z) A+ e) t– whose normal operating voltages exceed the limits for an SELV CIRCUIT under normal
9 T9 ?* ]3 ]' v+ Y3 G+ koperating conditions and
7 V: v2 I& N+ O1 g7 {– which is not subject to overvoltages from TELECOMMUNICATION NETWORKS
4 y1 j! W [/ j& ^" G! R$ K1.2.8.14 TNV- 3 CIRCUIT: TNV CIRCUIT
5 J0 V C$ m4 @/ k/ Y. f– whose normal operating voltages exceed the limits for an SELV CIRCUIT under normal( F/ B6 g, v6 R4 l( d! O
operating conditions and% [5 X: j( m" P( v, \ G
– on which overvoltages from TELECOMMUNICATION NETWORKS and CABLE DISTRIBUTION SYSTEMS4 Y4 [7 U! `7 ?$ i V/ b
are possible |
|