One-line diagram symbols...
One-line diagram symbols...
(OP)
In a one-line diagram, can you use a simple disconnect symbol to represent a circuit breaker? Or do you use the typical circuit breaker symbol... the line broken with a little arched line over it? I only ask because I am looking at the previous Engineers drawings and I am not sure if his one line diagram of our Plants High Voltage Distribution System is totally correct. Here is an example of the symbols.. I know, kind of a dumb question...
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RE: One-line diagram symbols...
The simple disconnect symbol is usually used to represent a disconnect device, such as a 3 blade disconnect with device number of 8 or 89.
I'm sure that someone else will remember what the ANSI standard is for all the symbols
RE: One-line diagram symbols...
RE: One-line diagram symbols...
In all the cases, the device no. for CB, that is, 52 is written adjacent to the symbol.
RE: One-line diagram symbols...
rrag's description matches mine: the boxed 52 device. Also, for drawout [metalclad] MV gear, nested chevrons may be shown —>>—
One approach is to reserve the ‘arc’ symbol for LV AC{+DC} auxiliary station-power components.
RE: One-line diagram symbols...
In general it is best to show a legend/key listing on the drawing of all the symbols used so there is never any confusion.
RE: One-line diagram symbols...
Perhaps someone more familiar with IEC symbols could comment.
For MV and HV circuit breakers, I would normally use a square box with either CB or a circuit breaker number inside. If it were drawout, I would use -<<- ->>- on the leads.
RE: One-line diagram symbols...
RE: One-line diagram symbols...
RE: One-line diagram symbols...
My copy is from 1980 and is based on 1978 standards. Not in electronic form, I'm afraid. You might try asking a Siemens rep if they have an up-to-date version. Also look at the "American & European Electrical Symbols" thread in the IEEE Code Issues forum.
German schematics are laid out for ease of manufacture I think. We had a line-up of about 10 MV breakers and it took over 100 pages of schematics. It is very difficult to get the whole picture and figure out how things will work. Even the Brown Boveri field engineer on the project I was working on in 1980 said he made his own US style elementary diagrams to aid in field work.