Pierre,
Subclass X capacitors are not allowed in this case. Double insulation or
reinforced insulation is permitted to be bridged by capacitor(s) complying
with IEC60384-14, subclass Y. For details see Cl. 1.5.7 (bridging
capacitors) of IEC60950:2001.
John Radomski
Clare
"Pierre SELVA"
<pierre.selva@worldonli To: "Forum Safety-emc"
ne.fr>
<[email protected]>
Sent by: cc:
owner-emc-pstc@majordom Subject: TR: 60950 -
Insulation between mains
o.ieee.org and secondary with
capacitors
01/11/02 12:18 PM
Please respond to
"Pierre SELVA"
Hi forum members,
I would like to know your meaning on the following :
The concerned product is in the 60950 scope (EN, UL or IEC). I would like
to make the insulation between the mains and the secondary without
transformer, but only with capacitors (X rated). In fact, I need to use
only the high frequency signals transmitted on the mains. In this case,
the capacitors are considered as short circuit, and the 50 (or 60) Hz is
cutted by caps.
The circuit is as follow :
C T1
---------------| |-------------+ +-----
Mains + + Secondary part
---------------| |-------------+ +------
C
C are X rated capacitors
T1 is only a signal transformer (not use for galvanic insulation)
My questions are :
- Is this insulation correct according to reinforced insulation
requirements ?
- May I use only one caps for C, or 2 serial caps (in case of first
default) ?
- Do you see other critical points regarding 950 requirements ?
Thanks a lot for your contribution,
Best regards,
Pierre
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