To add to what has been said regarding IEC filter/switch mounting,
there are two more things that should be considered:
1. If a material such as plastic is used, it must meet the mechanical
abuse requirements,ie impact, heat, without allowing access to
hazardous voltages.
2. If the filter has a metal case, the filter will have a harder time
filtering the high frequencies. A wire, even 18 AWG, is an inductor.
The multi-point metal to metal contact makes for a much more efficient
connection to discharge the energy from the internal filter
capacitors.
Eric Petitpierre
Pulsecom
Herndon, VA
[email protected]
______________________________ Reply Separator _________________________________
Subject: Re: UL/TUV requirements
Author: [email protected] at SMTP
List-Post: [email protected]
Date: 9/1/96 6:42 AM
On Thu, 29 Aug 1996, Michael Roy wrote:
> I have a chassis with a standard IEC type input filter and simple
> on/off switch that goes to an enclosed switching power supply
> subassembly. As it is designed right now, all of the AC componants
> are enclosed in a metal box that mounts to the inside of the chassis.
> The connections are all 1/4 inch faston type crimps and are completely
> insulated. The main chassis itself will not be opened by the end user
> for any reason.
>
> My question: Can I do away with the steel around the input filter
> and on/off switch ?
>
Should be no problem, if the enduser never opens parts of the enclosure
that carry hazardous voltages.
Take a screwdriver and open some computer monitors that are available to
you and see for yourself what is acceptable (provided the monitors are
TUV or UL approved)
regards
rene
>
>
