Alex

1) This configuration will not be acceptable for reinforced insulation. But
(depends on the application) you may have other ways to bypass the need for
reinforced insulation. 

2) The transorb is not going to be any good for you since it does not solve
your lack of insulation problem


Ilan Cohen
Technical Director, Safety & Telecom Divisions
I.T.L (PRODUCT TESTING) Ltd.
26 Hacharoshet St, POB 211, Or Yehuda, Israel.
Tel 972-3-5339022, Fax 972-3-5339019
[email protected], website: http://www.itl.co.il 





From: Alexandru Guidea [mailto:[email protected]]
Sent: Tuesday, May 06, 2003 6:47 PM
To: '[email protected]'
Subject: reinforced insulation - EN60950



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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