29.Electrical System Symbol AutoCAD Blocks

Electrical System Symbols
Master Time System
Lightning Protection And Grounding System
General Abbreviation
Security System Symbols
Building Automation System Symbols
Fire Alarm System Symbols
Luminaire Symbols & Abbreviation
Telephone System Symbols
Matv. System Symbols
Sound System Symbols

I also suggest downloading Electric Symbols.

File format: .DWG
Size: 141KB
Source: Collect
AutoCAD platform 2018 and later versions. For downloading files there is no need to go through the registration process