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 Post subject: Maintenance Switch Symbols
PostPosted: Tue Jan 25, 2011 3:21 pm 
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What symbol are you using to depict Maintenance switches on single line, three line and schematic drawings? We are considering "69MS". Comments? Industry Standard yet?


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PostPosted: Tue Jan 25, 2011 7:36 pm 
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Location: Cincinnati, OH
We use the letters "RELT" in a circle to represent the switch, connected with a dotted line to a relay. RELT = Reduced Energy Let Through


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PostPosted: Wed Jan 26, 2011 11:45 am 
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Joined: Wed Jun 04, 2008 9:17 am
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Location: Spartanburg, South Carolina
jcourvi wrote:
What symbol are you using to depict Maintenance switches on single line, three line and schematic drawings? We are considering "69MS". Comments? Industry Standard yet?

I would think 43MS would be better. 43 is a manual transfer or selector device.
Quote:
A manually operated device that transfers the control circuits in order to modify the plan of operation of the switching equipment or of some of the devices.
69 is permissive control device.
Quote:
Generally, a two-position device that in one position permits the closing of a circuit breaker, or the placing of an equipment into operation, and in the other position prevents the circuit breaker or the equipment from being operated.

43 seems more appropriate.


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PostPosted: Sun Jan 30, 2011 4:00 pm 
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jcourvi wrote:
What symbol are you using to depict Maintenance switches on single line, three line and schematic drawings? We are considering "69MS". Comments? Industry Standard yet?


We use ZES, which I assume is something like zone electrical switch.


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