DSH 445 Protection of users

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广东安规检测
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DSH 445

Protection of users

7

60950-1(ed.1)

Standard:
IEC 60950-1:2000, 1st ed,
Sub clause:
7
0 @5 L* m" H1 a) P, N+ t8 k! H0 VSheet No.
6 o; }6 _: _9 J9 c7 y2 J! u445
Subject:
  Q& h! @: r6 k7 _  z2 HProtection of users
3 `2 X, O& K' G( J7 o% A' E: UKey words:
Antenna, voltage surge test
Decision taken at the
/ U, \+ i) I1 e4 h$ d40th meeting 2003
: K! |; S% t, m6 p" w; d5 YQuestion:
- c: s2 v8 B5 H6 \* J- v/ I9 g/ MFor 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
(UTP)?
8 t* V9 S' T! k7 f0 q$ ?  nSee attached diagram.
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 o' u% G; R0 T6 T4 H1 Lappropriate requirements per 7.1. Additionally,
(a) Sub-clause 7.3.1 is applied between the external antenna connection (terminal) and Primary
4 U& B! U1 S2 t& Y6 J% _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.
1 h1 u7 S, g4 E, L) s(c) Sub-clause 7.2 is applied between the external antenna connection (terminal) and the SELV
1 y7 G8 \, Z! Z2 @connector (RJ -45) when the antenna cabling is UTP.
7 o) [; g& g* R- u" @9 ]

8 R) e5 F  [7 l: B( s