Hi John,
I read your quote below regarding the safety implications of placing
MOVs between AC power and ground:
"Some ban it already: others will in due course, AFAIK."
What about sidactors? (essentially a specialized Silicon Controlled
Rectifier).
We have used them on Telecom circuits with good success with hipot and
surge testing. They are more reliable than MOV's as they don't degrade
with every activation.
Are sidactors banned? Will they be banned? If not, they are an
excellent alternative to MOVs. I know of two manufacturers: Teccor and
Raychem. Small quantities of the Raychem parts are available from
Digi-Key (www.digikey.com).
Chris Maxwell | Design Engineer - Optical Division
email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797
8024
NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA
web www.nettest.com | tel +1 315 797 4449 |
> -----Original Message-----
> From: John Woodgate [SMTP:j...@jmwa.demon.co.uk]
> Sent: Friday, April 19, 2002 4:31 PM
> To: emc-p...@majordomo.ieee.org
> Subject: Re: Varistor to Ground
>
>
> I read in !emc-pstc that Dan Kwok <dk...@intetron.com> wrote (in
> <3cc06a29.e6198...@intetron.com>) about 'Varistor to Ground', on Fri,
> 19
> Apr 2002:
> >Is it generally permissible to put a varistor (MOV) across the 120
> Vac
> >line and ground for surge suppression/line conditioning products? I
> can
> >see some potential safety implications here if the MOV shorts but I
> am
> >interested in how this is addressed in the relevant safety standards.
>
>
> Some ban it already: others will in due course, AFAIK.
> --
> Regards, John Woodgate, OOO - Own Opinions Only.
> http://www.jmwa.demon.co.uk
> Interested in professional sound reinforcement and distribution? Then
> go to
> http://www.isce.org.uk
> PLEASE do NOT copy news posts to me by E-MAIL!
>
> -------------------------------------------
> This message is from the IEEE EMC Society Product Safety
> Technical Committee emc-pstc discussion list.
>
> Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/
>
> To cancel your subscription, send mail to:
> majord...@ieee.org
> with the single line:
> unsubscribe emc-pstc
>
> For help, send mail to the list administrators:
> Ron Pickard: emc-p...@hypercom.com
> Dave Heald: davehe...@attbi.com
>
> For policy questions, send mail to:
> Richard Nute: ri...@ieee.org
> Jim Bacher: j.bac...@ieee.org
>
> All emc-pstc postings are archived and searchable on the web at:
> http://ieeepstc.mindcruiser.com/
> Click on "browse" and then "emc-pstc mailing list"
-------------------------------------------
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/
To cancel your subscription, send mail to:
majord...@ieee.org
with the single line:
unsubscribe emc-pstc
For help, send mail to the list administrators:
Ron Pickard: emc-p...@hypercom.com
Dave Heald: davehe...@attbi.com
For policy questions, send mail to:
Richard Nute: ri...@ieee.org
Jim Bacher: j.bac...@ieee.org
All emc-pstc postings are archived and searchable on the web at:
http://ieeepstc.mindcruiser.com/
Click on "browse" and then "emc-pstc mailing list"
