Are you looking for a collection of standard drawing symbols? It may depend on where you live. And the rules for which ones are used and why will be found in your local electrical code. You will probably have to find a copy of your electrical code at the library or a book store. Or ask someone at a construction site to show you his drawing. The builders usually turn over a copy of the final construction prints to the building owner or maintenance group.
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A great troubleshooting tip...."When you eliminate the impossible, whatever remains, however improbable, must be the truth." Sir Arthur Conan Doyle
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