What is the use of civil drawing for an electrical engineer?
It can be very needed if you want to take the path of a professional engineer. 

For example, if you want to design electrical or telecommunications installations in buildings, you'll likely be required to be able to actually draw the plans for the installations. 

If you want to design radio installations (say cellular telephone network base station location), you'll often need to be able to do civil drawings and to read them. In some simpler building projects (for example using pre-fabricated container-based structures), from what I see at least here in Serbia, it's not uncommon for electrical engineers to do what could be considered civil engineering part as well.