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根据UL 60950 的说法如下:
* G: y2 @ f) C [1.2.8.12 TNV-1 CIRCUIT: TNV CIRCUIT
+ L& C1 E! e$ F– whose normal operating voltages do not exceed the limits for an SELV CIRCUIT under
5 B. S1 ]2 L6 r7 \) Inormal operating conditions and
; I# Y' @4 T2 U7 s3 e% z$ X– on which overvoltages from TELECOMMUNICATION NETWORKS and CABLE DISTRIBUTION SYSTEMS
2 ?1 A+ ?, s7 f( G* ]are possible5 J9 a3 v' d! X# a7 B ?! G
1.2.8.13 TNV-2 CIRCUIT: TNV CIRCUIT
# l0 u7 W8 Q* ~: h- G# ~– whose normal operating voltages exceed the limits for an SELV CIRCUIT under normal/ D% I1 c* Z! @) N7 c' j0 z7 N, `
operating conditions and
/ e* k% N; w1 W1 D– which is not subject to overvoltages from TELECOMMUNICATION NETWORKS" U; v# j! E' i$ I& r
1.2.8.14 TNV- 3 CIRCUIT: TNV CIRCUIT( W/ x" Q0 S8 L7 u* u9 o% ^5 C
– whose normal operating voltages exceed the limits for an SELV CIRCUIT under normal; W% x D. ^! u) z
operating conditions and5 ?4 i# @2 w5 Q6 h3 u( m* E* V
– on which overvoltages from TELECOMMUNICATION NETWORKS and CABLE DISTRIBUTION SYSTEMS* J5 ]- S9 t- }1 I- F
are possible |
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