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根据UL 60950 的说法如下:
5 p2 U3 J* X9 ~1.2.8.12 TNV-1 CIRCUIT: TNV CIRCUIT2 ^5 O7 Q( A* z# P
– whose normal operating voltages do not exceed the limits for an SELV CIRCUIT under2 z9 v1 Q- i6 \2 U) a) C
normal operating conditions and8 F6 ?( l8 v8 j6 W, W) l
– on which overvoltages from TELECOMMUNICATION NETWORKS and CABLE DISTRIBUTION SYSTEMS
+ H9 h0 T8 p/ k) Fare possible
1 [2 c( ^6 ?+ ]; {% w1 N1.2.8.13 TNV-2 CIRCUIT: TNV CIRCUIT! [" v: y- r. ~% `4 t
– whose normal operating voltages exceed the limits for an SELV CIRCUIT under normal
- @6 m6 z! M/ {, f* z1 foperating conditions and/ c3 L# J8 d" b- v
– which is not subject to overvoltages from TELECOMMUNICATION NETWORKS
! w) i& K* }. |, y' y1 o+ E1.2.8.14 TNV- 3 CIRCUIT: TNV CIRCUIT
3 I# Q C0 b! Q" y' R( a– whose normal operating voltages exceed the limits for an SELV CIRCUIT under normal5 A! Z" @, A( U* n8 l
operating conditions and
0 s4 ], w2 x* |– on which overvoltages from TELECOMMUNICATION NETWORKS and CABLE DISTRIBUTION SYSTEMS
) }4 C3 c! ?9 I! pare possible |
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