Re: [PSES] Basic Schematic Creation Software

2021-05-22 Thread Matthew Wilson | GBE 
The Draw component of Libre Office https://www.libreoffice.org/ has symbol 
extensions for schematics here https://sschmidhuber.github.io/LibreSymbols/

Draw lets you make rubber band connections between elements, handy for 
reorganising a drawing as it is made without having to redraw all the 
connection lines.

HTH.

Matthew Wilson,
GB Electronics (UK) Ltd.


Matthew Wilson
Technical Director
GB Electronics (UK) Ltd
matthew.wil...@gbelectronics.com
https://gbelectronics.uk
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From: Brian Kunde 
Sent: 20 May 2021 16:53
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Basic Schematic Creation Software


I am in need of a simple program for creating simple schematics of Safety 
Circuits in a variety of States.  I envision something that I can easily insert 
door switches, relays, button switches, e-stops, fuses, circuit breakers, etc.. 
 It would be nice if once laid out, I can simply click to change the state of a 
switch or relay to represent different states of a Safety Function.  And then 
save it off in .pdf format.

Does anyone know of some software that will do this for a low cost or maybe 
Free?  This is something we will use only a few times a year.

Thanks to all in advance for any information.

Regards,
The Other Brian


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This message is from the IEEE Product

Re: [PSES] Safety Question :: Isolation requirements for AC supply: phase-phase and phase-neutral

2021-05-22 Thread André Videira 
Hello James,

>From my understanding, it should be functional isolation.
Take a look at IEC 60664-2-1, it will probably help you. It has some
examples on how to do this.

Em sáb., 22 de mai. de 2021 14:48, James Pawson (U3C) <
ja...@unit3compliance.co.uk> escreveu:

> Hi all,
>
>
>
> Currently helping a customer with a 3-phase power monitoring product to
> get their electrical safety in order. I understand the requirements for
> safety isolation from hazardous live/ES3 to user accessible terminals/ES1
> based on the possible mains transient voltage of up to 2500Vpk (OVC II).
>
>
>
> The fundamental question I’m trying to answer is: *are there any
> requirements for safety isolation for the AC supply from phase-to-phase or
> phase-to-neutral? *My understanding is that the requirements are for
> Functional Insulation only between these lines.
>
>
>
> Looking at things with my EMC hat on for a moment, we typically conduct
> Surge tests to IEC 61000-4-5 at 2kV line-to-earth (see above mains
> transient voltage) but also 1kV line-to-line. *Should any functional
> insulation requirements be based on the working voltage of the phase(s) or
> the potential line-to-line overvoltage condition of 1kV (or more depending
> on the environment/OVC)?*
>
>
>
> Referring to IEC 60664-1 I can see that (in table F.4), for a 230/400
> 3-phase supply, the line-to-line voltage is rationalized to 400Vac. This
> suggests that line-to-line surges are not taken into account.
>
>
>
> Are my assumptions correct or am I missing something?
>
>
>
> Thanks and all the best
>
> James
>
>
>
>
>
>
>
> James Pawson
>
>
>
> *Unit 3 Compliance Ltd*
>
> *EMC : Environmental : Safety : CE + UKCA : Consultancy*
>
>
>
> www.unit3compliance.co.uk  |  +44(0)1274 911747  |  +44(0)7811 139957
>
> 2 Wellington Business Park, New Lane, Bradford, BD4 8AL
>
> Registered in England and Wales # 10574298
>
>
>
>
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> well-used formats), large files, etc.
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[PSES] Safety Question :: Isolation requirements for AC supply: phase-phase and phase-neutral

2021-05-22 Thread James Pawson (U3C) 
Hi all,

 

Currently helping a customer with a 3-phase power monitoring product to get
their electrical safety in order. I understand the requirements for safety
isolation from hazardous live/ES3 to user accessible terminals/ES1 based on
the possible mains transient voltage of up to 2500Vpk (OVC II).

 

The fundamental question I'm trying to answer is: are there any requirements
for safety isolation for the AC supply from phase-to-phase or
phase-to-neutral? My understanding is that the requirements are for
Functional Insulation only between these lines.

 

Looking at things with my EMC hat on for a moment, we typically conduct
Surge tests to IEC 61000-4-5 at 2kV line-to-earth (see above mains transient
voltage) but also 1kV line-to-line. Should any functional insulation
requirements be based on the working voltage of the phase(s) or the
potential line-to-line overvoltage condition of 1kV (or more depending on
the environment/OVC)?

 

Referring to IEC 60664-1 I can see that (in table F.4), for a 230/400
3-phase supply, the line-to-line voltage is rationalized to 400Vac. This
suggests that line-to-line surges are not taken into account.

 

Are my assumptions correct or am I missing something?

 

Thanks and all the best

James

 

 

 

James Pawson

 

Unit 3 Compliance Ltd

EMC : Environmental : Safety : CE + UKCA : Consultancy

 

  www.unit3compliance.co.uk  |
+44(0)1274 911747  |  +44(0)7811 139957

2 Wellington Business Park, New Lane, Bradford, BD4 8AL

Registered in England and Wales # 10574298

 



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