First of all, I guess you need a new layer for Electrical and one for General.
So, you do to Format->Layer and Add two New Layers. Then make your draw and when selecting an object and view it's proprieties, you can include it in the layer you want. At Proprieties you can select witch tipe of line you need.
But if you want for example the same type for all Electrical and other type for General, you can leave at Proprieties the option Linetype or Lineweight:ByLayer, and then at Format->Layer you can customize each layer Linetype or Lineweight... I hope this helped you. If not, read more when pressing F1.