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根据UL 60950 的说法如下:1 B9 ?4 P+ N, v c# U1 `6 v
1.2.8.12 TNV-1 CIRCUIT: TNV CIRCUIT
9 z0 E: ~& w6 C2 B- v2 T2 I8 q– whose normal operating voltages do not exceed the limits for an SELV CIRCUIT under5 d7 k/ [ P& o! }; i
normal operating conditions and
0 N2 ?2 \% [- U7 \2 n) Y% y5 y: A" o– on which overvoltages from TELECOMMUNICATION NETWORKS and CABLE DISTRIBUTION SYSTEMS
% D4 {2 X. R Fare possible
9 i0 f- v) `2 n& u1.2.8.13 TNV-2 CIRCUIT: TNV CIRCUIT' I/ y( S1 G h. N/ H6 h
– whose normal operating voltages exceed the limits for an SELV CIRCUIT under normal
; ? _9 Z! ?! M% b3 Voperating conditions and
9 X. m3 u2 R: C5 R– which is not subject to overvoltages from TELECOMMUNICATION NETWORKS$ I; e4 n0 H+ l9 w- j
1.2.8.14 TNV- 3 CIRCUIT: TNV CIRCUIT+ \3 Z* ~& S- _* ~
– whose normal operating voltages exceed the limits for an SELV CIRCUIT under normal. f( ]/ C" ~# [; ~
operating conditions and' L% b1 R) f9 v8 Q
– on which overvoltages from TELECOMMUNICATION NETWORKS and CABLE DISTRIBUTION SYSTEMS
) D$ S) W% o. K, qare possible |
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