DSH 446 Protection of users

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DSH 446

Protection of users ) n) @7 B- [* W

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60950(ed.3) , A9 X& }$ j) I

9 p1 A$ K1 q5 S* w6 b# F  B- EStandard:
# ?9 E0 ?2 B! K: b) GIEC 60950, 3rd ed.
Sub clause:
7
Sheet No.
446
6 L- T' z( v$ F* V0 P9 b$ i* eSubject:
! b" c; [* v1 _6 `" OProtection of users
2 _! p/ O# l" n" L7 L: k( |Key words:
" i4 A$ M+ x: X& d0 s) Z. ]4 sAntenna, voltage surge test
0 b( o2 R$ O+ d7 m  ^8 |Decision taken at the
40th meeting 2003
, {6 `; R3 l% a/ }Question:
For protection of users and service persons from transients and voltage surges, what are the appropriate
8 C" ^7 R& U9 s+ ~requirements between the following points for ITE connected to an external antenna:
) z2 G+ I! G2 c% A3 j* |* F  a(a) antenna connection and Primary circuits?
(b) antenna connection and SELV circuits when the antenna cabling is coax?
6 u' X" L: j3 @(c) Antenna connection and SELV circuits when the antenna cabling is unshielded twisted pair
' h) ^' W; v; k/ r# ^' J(UTP)?
3 {. k; f+ k) ~See attached diagram.
  h; i# E# r9 \. [0 HDecision:
Since Clause 7 is in IEC 60950-1, but is not in IEC 60950 3rd Ed, the requirements cannot be used for the 3rd
edition.
# {& ^' F/ ]! u! J+ q$ `This decision applies to IEC 60950-1 3rd edition.
In the case of IEC 60950 3rd edition sub clause 10.1 of IEC 60065 6th edition is to be applied, by referring to
IEC Guide 112 2nd edition "Guide on the safety of multimedia equipment".
Although, the test of 10.1 to IEC 60065 requires test between the terminal for the connection to antenna and
& _& ^3 [: c1 [0 m) A4 _Mains supply Terminals, and not between the terminal for the connection to antenna and SELV.
  u' n% V9 g3 k# K" Y* }