DSH 445 Protection of users

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DSH 445 2 K$ z3 x; n$ k# b$ z% S ; Z9 D% `/ _+ g+ B: m5 e" ?- D2 @

Protection of users 8 e4 S9 ?! ~7 `4 Y* |9 q

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60950-1(ed.1) 4 m" T6 E4 B9 y2 D1 o

- H% i3 X$ W' L, h7 H' R8 IStandard:
IEC 60950-1:2000, 1st ed,
Sub clause:
7
8 R0 l1 T% z* m8 f3 Y: NSheet No.
445
Subject:
Protection of users
Key words:
% s  t- `8 @% X$ kAntenna, voltage surge test
Decision taken at the
( G$ c  [, R8 i/ w5 q3 S9 K2 C; p- y40th meeting 2003
Question:
1 h. O/ W9 ^- [/ }1 [( @, d1 AFor protection of users and service persons from transients and voltage surges, what are the appropriate
requirements between the following points for ITE connected to an external antenna:
(a) antenna connection and Primary circuits?
(b) antenna connection and SELV circuits when the antenna cabling is coax?
(c) Antenna connection and SELV circuits when the antenna cabling is unshielded twisted pair
: B7 u3 n' w& t% L; }(UTP)?
" X: m3 M; q* VSee attached diagram.
9 |  c7 b* r% |2 g% O' ?Decision:
Since Clause 7 is in IEC 60950-1, but is not in IEC 60950 3rd Ed, all references are to IEC 60950-1
The circuit connected to the antenna is classified in accordance with Sub-Clause 7.1 and subjected to the
2 v# L# R7 P% [, B: U' Lappropriate requirements per 7.1. Additionally,
! B& S; _& t9 U/ M4 ^$ j(a) Sub-clause 7.3.1 is applied between the external antenna connection (terminal) and Primary
6 J* y2 ?3 W! ^" a, @; w$ ~circuits.
(b) Sub-clause 7.2 is applied between the external antenna connection (terminal) and the SELV
connector (RJ -45) when the antenna cabling is coax.
(c) Sub-clause 7.2 is applied between the external antenna connection (terminal) and the SELV
9 D6 J8 m$ |  Y) t( r" Q$ }, cconnector (RJ -45) when the antenna cabling is UTP.
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