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根据UL 60950 的说法如下:/ u3 _ S& d. |% u2 ]3 ^2 f
1.2.8.12 TNV-1 CIRCUIT: TNV CIRCUIT
, z* ?7 G% ]& O! k: b– whose normal operating voltages do not exceed the limits for an SELV CIRCUIT under
; g) y: L) `# R; r5 Onormal operating conditions and
) F# }% o8 D% B2 W' g) Q– on which overvoltages from TELECOMMUNICATION NETWORKS and CABLE DISTRIBUTION SYSTEMS
( C6 m! R/ c" w2 i1 Pare possible
5 m$ g/ ?/ x( r' X% Y7 ?; _& a- S1.2.8.13 TNV-2 CIRCUIT: TNV CIRCUIT
2 O) A: C, j2 y3 Z6 B– whose normal operating voltages exceed the limits for an SELV CIRCUIT under normal
4 k. t" g4 r& P* U9 coperating conditions and' x' X3 B6 i. Y6 u0 g
– which is not subject to overvoltages from TELECOMMUNICATION NETWORKS2 x6 ~# M& N' M& C; s
1.2.8.14 TNV- 3 CIRCUIT: TNV CIRCUIT) e! M% ]! S. s2 k* M3 c8 T
– whose normal operating voltages exceed the limits for an SELV CIRCUIT under normal7 U5 n) S5 v" d* i' i
operating conditions and
o+ |! e, l+ {* {+ V. d5 U– on which overvoltages from TELECOMMUNICATION NETWORKS and CABLE DISTRIBUTION SYSTEMS
! }1 W9 P+ J3 k' m9 C+ Qare possible |
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