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根据UL 60950 的说法如下:
& T$ M1 X6 H% W D1 c1.2.8.12 TNV-1 CIRCUIT: TNV CIRCUIT2 ~" L! D3 e, D2 M
– whose normal operating voltages do not exceed the limits for an SELV CIRCUIT under
. w0 k3 y& v7 k* S8 ?normal operating conditions and( z# A! Z& q2 W) l; @
– on which overvoltages from TELECOMMUNICATION NETWORKS and CABLE DISTRIBUTION SYSTEMS( h4 L, D3 G. b
are possible
7 K7 K+ x& x* }: |0 V6 c8 [, j% s1.2.8.13 TNV-2 CIRCUIT: TNV CIRCUIT% m H" t# v1 I6 i+ Z7 n0 [
– whose normal operating voltages exceed the limits for an SELV CIRCUIT under normal1 I+ G+ N( B0 D/ t
operating conditions and' \/ \1 v9 a/ g. h6 f
– which is not subject to overvoltages from TELECOMMUNICATION NETWORKS
4 L9 K* r6 I, {/ I) b: C* ]! i q1.2.8.14 TNV- 3 CIRCUIT: TNV CIRCUIT) ?( i/ U6 V* i+ R
– whose normal operating voltages exceed the limits for an SELV CIRCUIT under normal- e$ B5 H8 \& g- U/ F S
operating conditions and
# ~2 ~6 [1 F7 \3 ]– on which overvoltages from TELECOMMUNICATION NETWORKS and CABLE DISTRIBUTION SYSTEMS) R( m( ^8 ?$ s: A) O
are possible |
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