Re: [PSES] Shorting switch - appropriate markings

[Mike Sherman ----- Original Message -----]

Application sounds like "lock out tag out. " Might offer another way to think about useful symbols (e.g., padlock).
Mike Sherman
Graco Inc.

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------ Original Message ------

From: Scott Aldous
To: EMC-PSTC@LISTSERV.IEEE.ORG
Sent: October 11, 2016 at 10:30 AM
Subject: Re: [PSES] Shorting switch - appropriate markings

Hi Doug,

It might be worth looking into practices for MV switchgear, where circuits are sometimes grounded during maintenance (not the same thing, but a similar concept). Here is an example from Siemens:

http://www.energy.siemens.com/us/pool/us/power-distribution/ansi-standard-products/medium-voltage-switchgear/metal-enclosed-load-interrupter-switchgear-type-simosec-5-kv-27-6kv/SIMOSEC%20ANSI_02_final.pdf

Fig. 8 shows a diagram of the 3 position switch design that prevents accidental shorting of the supply to ground. It's a little hard to see the detail, but Fig. 5 shows some markings for the switch position indication (and a warning on the same panel that isn't good enough resolution to actually read), but no standard symbols are used, only English. Reliance on restriction of access to qualified individuals only might make the use of symbols less common with MV equipment, but maybe there are better examples out there.

On Tue, Oct 11, 2016 at 1:25 AM, John Allen <john_e_al...@blueyonder.co.uk> wrote:

John’s suggestion sounds reasonable, but I think you also need the triangular Caution symbol and/or the ISO symbol telling you to “consult the manual”, adjacent to the switch.

 

John E Allen.

W.London, UK

 

From: John Woodgate [mailto:jmw1...@btinternet.com]
Sent: 11 October 2016 08:53
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Shorting switch - appropriate markings

 

Would IEC 60417-5274: Manual change-over unit do?

 

With best wishes DESIGN IT IN! OOO – Own Opinions Only

www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England

 

Sylvae in aeternum manent.

 

From: Doug Powell [mailto:doug...@gmail.com]
Sent: Tuesday, October 11, 2016 7:49 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Shorting switch - appropriate markings

 

Hello all,

 

As we all know there are a variety of ON & OFF symbols available with slightly different usage depending on the situation.

 

IEC 60417-5007 Power ON
IEC 60417-5008 Power OFF

IEC 60417-5009 Standby

IEC 60417-5010 ON-OFF

IEC 60417-5011 ON/OFF, push button

IEEE 1621 Sleep Mode

 

I now have a situation where I want to use a shorting switch on equipment to prevent a stored energy hazard while in maintenance mode. The idea is to provide instructions on how to discharge the equipment and then close the switch to prevent a voltage build up until maintenance is complete, then open the switch.  My concern is identifying the appropriate symbol to place next to the switch positions.  None of the above seem appropriate.  In addition I have searched through  ISO 7000 and 7010 with no luck.

 

Can anyone suggest an internationally recognized symbol for this purpose?

 

 

Thanks,  Doug

​

 

--

 

Douglas E Powell

doug...@gmail.com
http://www.linkedin.com/in/dougp01

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