Well - lets start with what are you using? Are you using Revit, Revit Arch, Revit MEP?
It would be best to use Revit (Part of the BDS Premium or Ultimate) or Revit MEP.
If you only have Revit Arch - you can place the electrical components but to create any wire runs and such - it will be just drafting or model lines.
You could change the discipline to Electrical - which will halftone everything that is architectural so your electrical components will stand out.
So there are a few options...
Does any of this help?
LD
Start by duplicating your Floor Plans View(s) and change the View Name and Discipline to reflect the intentions of the View. As Lisa stated previously, that will affect the overall display settings of the View to suit the plan (i.e. Architectural Categories will be half-tone, MEP Categories will be normal).
Technically, you can place the electrical devices in any View, and since Revit is database, they can be displayed on any of your Views. If you have no electrical families loaded, you should be able to find some basic electrical families in your default library.
Is this the kind of answer you were looking for?
First, check to see if there are any already loaded into your Project. In your Project Browser, under Families, is there a listing for 'Electrical Fixtures'? If not, then no Families of that Category are currently loaded.
Go to the Insert tab on the Ribbon and click 'Load Family'. This should automatically browse to the default Revit Library unless you've redefined the folder location. Do you see a folder named 'Electrical'? I can't say absolutely that this is the case - I'm actually an MEP user, but we can load Architectural Families using this method.