DSH 426 Triple insulated windings

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DSH 426 + d' [/ W& A* }& t0 Y/ b* i. P . @' ^5 S- ]0 c9 g

Triple insulated windings ( P% U, T6 e2 e% z/ q

57.9, 57.9.4   n; V" g% r- \# S7 B

60601-1(ed.2);am1;am2

' w7 w" |+ O1 b7 I+ E7 X7 jStandard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 57.9 57.9.4
Sheet n°: DSH-426
+ A  \+ B4 H9 m, uSubject: Triple insulated windings
) k; f* S7 x. p" H! N/ s' P0 xKey words: Triple, insulated, winding, transformer
Confirmed by CTL at its 39th meeting, in Cologne
Question:
Many manufacturers are using a triple insulated winding wire on a transformer, where
" k6 m; x- u# V4 C& s2 |" q1 Q6 ?DOUBLE, or REINFORCED INSULATION is required between the primary and the secondary
windings. Is this permitted?
Decision:
This is allowed, but precautions should be taken concerning possible mechanical damages to
the wires. Other requirements of 57.9 shall be applied.
0 e0 @2 _- F, o2 _' r) t
1 Q7 f/ w2 E" b( }