Alexandru,
The short answer is no, the circuit would not provide the equivalent of
reinforced insulation. However, have a look at 2.2.4 (60950-2000)-
Connection of SELV circuits to other circuits. You can connect SELV
circuits to other circuits provided, that under single fault conditions
(i.e. the transzorb, or fuse shorted out) you do not exceed the SELV
limits, and you have a minimum of basic insulation between SELV circuits
and the primary circuit (including the neutral).
Regards
Doug
Alexandru Guidea
<[email protected]> To:
"'[email protected]'" <[email protected]>
Sent by: cc:
owner-emc-pstc@majordom Subject: reinforced
insulation - EN60950
o.ieee.org
05/06/03 12:46 PM
Please respond to
Alexandru Guidea
Dear colleagues,
As part of a PCB design required to be compliant with EN60950, we want to
use the configuration described below, to be able to relax the traces
separation. The circuit intended to become SELV is accessible to the
operator.
Questions:
1. Is the combination of Basic Insulation + Fuse&Transorb(15V) equivalent
to
Reinforced Insulation?
2. Does the transorb have to comply with a specific EN safety standard
(like
one applicable to Y caps)?
Thanks,
Alexandru Guidea
CAE Inc.
Canada
Basic
Insulation
|
|
ELV--------||-------FUSE--------------SELV (??)
| T
| R
A
N
S
O
R
B
|
|
GND (EARTH)
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