DSH 445 Protection of users

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DSH 445

Protection of users / P; _/ d" C: z, K; Q

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60950-1(ed.1)

4 j! r9 B2 `1 ~8 \Standard:
' e$ D' |- P: A4 J$ M+ z( TIEC 60950-1:2000, 1st ed,
  S7 y- r( c) Y; s. f* M* ]1 E: DSub clause:
7
0 B' \& r) O- |0 J1 t3 P. wSheet No.
  Z+ V2 Q* M8 y; m' o% |6 [445
5 q$ R% V2 V7 a' _& m3 JSubject:
4 {) u% K/ m) D0 f5 m: SProtection of users
) K5 c" T5 d9 }: I4 A% kKey words:
% B& {5 L$ C3 u" q& v1 mAntenna, voltage surge test
Decision taken at the
' r# i$ D! s' d2 T' |40th meeting 2003
3 j% ^6 t9 X  q$ {  I" b4 F1 d. r' DQuestion:
For 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:
# P2 {& V: S8 ^9 z4 X0 c(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
: ?5 J0 G( B" n, e+ n(UTP)?
See attached diagram.
2 O" {  u3 x2 x: X* f* m/ A* {: G) wDecision:
Since Clause 7 is in IEC 60950-1, but is not in IEC 60950 3rd Ed, all references are to IEC 60950-1
* b# R5 E' k/ I. j7 X8 J5 ZThe circuit connected to the antenna is classified in accordance with Sub-Clause 7.1 and subjected to the
appropriate requirements per 7.1. Additionally,
$ X5 W% r# R  X: C) w- {(a) Sub-clause 7.3.1 is applied between the external antenna connection (terminal) and Primary
circuits.
& ]; ~& x* e# d$ n( w0 M% \(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
connector (RJ -45) when the antenna cabling is UTP.
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